World Industrial Store VA 500 Flow Meter for Compressed Air Instruction Manual

World Industrial Store VA 500 Flow Meter for Compressed Air

Product Specifications

• Model: VA 500 / VA 520 / VA 525 / VA 550 / VA 570
• Modbus Protocol: RTU
• Installation Version: V1.13
• Page Count: 29

Product Usage Instructions

1. Installation

Before mounting and initiating the device, carefully read the installation manual and follow the instructions provided.

Termination:

• For VA 500 / VA 520 / VA 525: Follow termination instructions as specified in section 3.1.1 of the manual.
• For VA 550 / VA 570: Refer to section 3.2.1 for termination guidelines.

Cable Specification:

Ensure to use the recommended cable specifications mentioned in section 3.3 of the manual for proper functionality.

2. Modbus RTU Communication Settings

To access and change Modbus settings, refer to section 4.1 of the manual. Make necessary adjustments as required for your setup.

3. Modbus TCP

Section 5 provides information on Modbus TCP settings. Follow the guidelines to configure Modbus TCP for your specific requirements.

4. Modbus Addressing Model

Understand the Modbus addressing model explained in section 6 of the manual. Learn about Function Code 3 for reading holding registers and Function Code 16 for writing multiple registers.

5. Modbus Holding Register

Explore the various registers available for configuration and monitoring purposes. Sections 7.1 to 7.5 provide detailed information on different register types and their functions.

6. Appendix

Refer to Appendix A for Exception code references in case of errors or issues encountered during operation.

Frequently Asked Questions

Q: What is the purpose of the VA 5xx Modbus function?

A: The VA 5xx Modbus function allows the MODBUS master device to read out the online measurement values from connected MODBUS slaves.

Q: What is MODBUS RTU protocol?

A: MODBUS RTU is a communication protocol commonly used in industrial control systems for communication between devices. It utilizes serial transmission modes and is based on a master-slave architecture.

Models

Foreword

Dear customer,

thank you very much for deciding in favour of the VA 500 / VA 520 / VA 525 /VA 550 / VA570. Please read this installation and operation manual carefully before mounting and initiating the device and follow our advice. A riskless operation and a correct functioning of the VA 500 / VA 520 / VA 525 / VA 550 / VA570 are only guaranteed in case of careful observation of the described instructions and notes

Instructions

This manual is intended to provide instructions for the installation and use of the VA 5xx MODBUS function. The VA 5xx MODBUS function can let the MODBUS master device to read out the online measurement values. This manual is not intended to be a complete tutorial on the MODBUS RTU protocol, and it is assumed the end user already has a general working knowledge of MODBUS RTU Communications, especially in respect of master station configuration and operation. However, an overview is included in the following section to explain some of the fundamental aspects of the protocol.

Definition and abbreviation

CRC| Cyclic Redundancy Check

Used for error—checking in MODBUS RTU. See appendix

---|---
Modbus Master| A MODBUS device, which is able to access data in one or more connected MODBUS slaves
Modbus Slave| A MODBUS device, which is able to respond to requests from a single MODBUS master
Modbus Address| Throughout this document the following notation is used to address

MODBUS RTU registers

Addressing : Holding Register 1009 is addressed in messages by 1008

PDU| MODBUS protocol data unit
ADU| MODBUS application data unit
MBAP| MODBUS application protocol
RS485| Refers to the 2—wire communication standard defined by EIA/TIA-485. (Physical layer)
Ethernet|

References

1. MODBUS over Serial Line Specification and Implementation Guide V1.02 modbus.org 2006 Dec 20
2. MODBUS APPLICATION PROTOCOL SPECIFICATION V1.1b modbus.org 2006 Dec 28
3. MODBUS Messaging on TCP/IP implementation Guide V1.0b 2006 Oct 34
4. Instruction manuals VA 5xx

Technical data Modbus VA 5xx

VA 5xx MODBUS RTU specification

General Modbus Information

The VA5xx Modbus module complies with the Modbus serial line protocol [Reference 1]. Among other things, this implies a master-slave protocol at level 2 of the OSI model. One node (the master) issues explicit commands to one of the,, save”-nodes and processes responses. Slave nodes will not transmit data without a request from the master node, and do not communicate with other slaves. Modbus is a mono-master system, which means that only one master can be connected at a time.

Serial transmission modes (RTU)

The VA 5xx Modbus mode support only one serial transmission modes; the RTU mode. The transmission mode defines the bit contents of message fields transmitted serially on the line. It determines how information is packed into the message fields and decoded. The transmission mode and serial port parameters must be the same for all devices on a Modbus serial line. RTU mode Modbus Application Data Unit (ADU) frame is shown below, and is valid for both requests and responses.

Table 1

Further details of the Modbus protocol can be found in Reference 1 and 2.

Installation

RS485 Bus Wiring (Modbus RTU) –VA 500 / VA520 / VA 525

Termination VA 500 / VA 520 / VA 525

Note: In case the VA 500 / VA 520 / VA 525 is the last device in the RS485 network then a termination is required. To be done either with

• a.) Internal DIP Switch
• b.) 120R between (between Pin 2 and Pin 4) of connector plug A

Bias

In order to avoid undefined bus levels, at any location on the bus, a bias network, one resistor to VCC (Modbus A) as well as to GND (Modbus B), has to be used.

RS485 Bus Verdrahtung (Modbus RTU) – Anschlussplan VA 550 / VA570

Termination VA 550 / VA 570

In case the VA 550 / VA 570 is the last device in the RS485 network then a termination with 120R between (between Pin 1 and Pin 3) at connector X2 is necessary.

Bias

In order to avoid undefined bus levels, at any location on the bus, a bias network, one resistor to VCC (Modbus A) as well as to GND (Modbus B), has to be used.

Bus cable:

Only cables according to the recommendations of EIA 485 standard should be used. A maximum of 64 devices may be connected to one segment. The bus cable must be laid at a distance of at least 20 cm from other cables. It should be laid in a separate, conductive, and earthed cable trunking. It must be ensured that no potential differences occur between the individual devices on the bus.

Cable specification:

Modbus RTU communication settings

Before communication with the master, baudrate, address, and framing must be defined

Accessing and changing Modbus settings

The Modbus communication settings could be changed by using either the PC service software from CS Instruments or by sensors with display in the Modbus setup menu.

Note:

It is recommended NOT to use the default address in a multi-slave network. It is of great importance to ensure at the time of the procedure of device addressing, that there is not two devices with the same address. In such a case, an abnormal behaviour of the whole serial bus can occur, the master being then in the impossibility to communicate with all present slaves on the bus.

Modbus RTU communication settings

Modbus TCP

Modbus communication requires the establishment of a TCP connection between a client (e.g. PC) and the sensor. The TCP port 502 reserved for Modbus is normally used for communication. However, the user can also configure a different port number. If a firewall is arranged between sensor and the client, it must be ensured that the configured TCP port is enabled.

Modbus addressing model

The VA 5xx RS485 Modbus allows read/write access according to chapter 8 Not defined registers are not accessible / not supported.

Byte Order:

The size of each Modbus register is 2 Byte. For a 32 bit value, two Modbus register will be read out by the VA 5xx. Accordingly, for a 16bit Value only one register is read. Data format VA 5xx:

Function Code 3 (Read holding register)

General exceptions:

• Requesting less than 1 or more than 125 registers => Exception 3 (Illegal data value)
• Requesting more than max. message size (27 registers) => Exception 2(Illegal data address)
• Requesting data out of defined range of registers chapter 8 => Exception 2 (Illegal data address)

Application exceptions:

• Application errors => Exception 4 (Slave device error)

Holes/register alignment:

• The read command always returns data if no exception is given. Bad start/end alignment will result in only parts of the data item being read.

Function code 16 (Write multiple registers)

In general, only status register (register 2001 – 2064) are writable.

General exceptions:

• Writing less than 1 or more than 63 registers => Exception 3 (Illegal data value)
• If Byte Count is not exactly 2 times NoOfRegisters => Exception 3 (Illegal data value)
• Exceeding max. message size (27 registers) => Exception 2 (Illegal data address)
• Writing data out of defined register range chapter 8 =>Exception 2 (Illegal data address)

Application exceptions:

• Application errors => Exception 4 (Slave device error)
• Application errors include writing to ReadOnIy holding registers

Holes/register alignment:

• If start-address is not the start of a mapped holding register => Exception 2 (Illegal data address)
• Writing to holes is allowed (ie ignored – and no exception occurs) — except for the condition described above

Modbus Holding Register

Basic Values Register (1…1000)

Modbus Register| Modbus Address| No.of Byte| ****

Data Type

| ****

Description

| Default Setting| Read Write| ****

Unit /Comment

---|---|---|---|---|---|---|---
1| 0| 4| UInt32| Serial Number| 0| R|
3| 2| 4| UInt32| Software Version| 0| R| sprintf(str,”%u.%02u”,hw>>16,hw&0 xffff);
5| 4| 4| UInt32| Hardware Version| 0| R| sprintf(str,”%u.%02u”,hw>>16,hw&0 xffff);
7| 6| 4| UInt32|  | 0| R|

9

| ****

8

| ****

4

| ****

UInt32

| ****

Production Date

| ****

0

| ****

R

| ****

Unix Time

11| 10| 4| UInt32| Calibration Date| 0| R| Unix Time
13| 12| 4| UInt32| Ordering Number| 0| R|
15| 14| 4| UInt32| RunTime| 0| R| Value in seconds
17| 16| 4| UInt32|  | 0| R|
19| 18| 4| UInt32| Atex Number| 0| R|
21| 20| 4| UInt32| Curve Version| 0| R| sprintf(str,”%u.%02u”,hw>>16,hw&0 xffff);

23

| ****

22

| ****

8

| ****

String

| ****

Brand Name

| ****

0

| ****

R

|

27

| ****

26

| ****

4

| ****

UInt32

| ****

LockSettings

| ****

0

| ****

R

| 0 = NoLock, 1 = DiameterLock, 2 =

CounterLock, 3 = RefConditionsLock

29

| ****

28

| ****

4

| ****

UInt32

| ****

OptionBoard

| ****

0

| ****

R

| Bit Mask

0 = no option        1 = 4-20mA 2 = Ethernet            4 = Mbus

8 = ProfiBus         16 = SDI

32 = Pressure      64 = Direction

31| 30| 4| Dword| Variant| x| R|
33| 32| 8| String| Company Name| x| R|

37

| ****

36

| ****

4

| ****

Dword

| OptionBoard HardwareVersion

(if available)

| ****

x

| ****

R

| sprintf(str,”%u.%02u”,hw>>16,hw&0 xffff);

39

| ****

38

| ****

4

| ****

Dword

| OptionBoard

SoftwareVerision (falls verfügbar)

| ****

x

| ****

R

| sprintf(str,”%u.%02u”,hw>>16,hw&0 xffff);

Values register (1001….1600)

For the bi-directional sensors VA500B and VA520B

Modbus Register| Modbus Address| No.of Byte| Data Type| Description|

Default

| Read Write| Unit /Comment
---|---|---|---|---|---|---|---
1001| 1000| 4| Float| Flow as shown in Display|  | R|
1003| 1002| 4| UInt32| Total Counter bevore comma as shown in Display|  | R|
1005| 1004| 4| Float| Total Counter after comma as shown in Display|  | R|
1007| 1006| 4| Float| Velocity as shown in Display|  | R|
1009| 1008| 4| Float| Gas Temperature as shoed in Display|  | R|
1011| 1010| 4| Float| Internal Temperature as shown in Display|  | R|
1013| 1012| 4| Float| Supply Voltage|  | R|
1015| 1014| 4| Float| Max Speed (at Velocity Unit as shown in Display)|  | R|
1017| 1016| 4| Float| Max Flow (at Flow Unit as shown in Display)|  | R|

1019

|

1018

|

4

|

Float

|

Status of Sensor

|  |

R

| noError 0x0000 NotCalibrated                                0x0001 LowVoltage                                0x0002

TempError            0x0004

HeatError              0x0008

IntError                  0x000a

HeatNotCal          0x0020

AmbNotCal 0x0040 TmpOutofRange 0x0080 Direction               0x0100 LowVolt4_20 0x0200 NextCalElapsed 0x0400 Direction not Cal 0x0800 SensConditioning 0x1000 CalZeroPnt 0x2000 PressureError 0x4000 deltaPressure  0x8000

Busy                    0x1 0000

1021| 1020| 4| Float| Flow Min at Flow Unit in Display since Clear Min/Max|  | R|
1023| 1022| 4| Float| Flow Max at Flow Unit in Display since Clear Min/Max|  | R|
1025| 1024| 4| Float| Flow AV at Flow Unit in Display|  | R| AV over the Time from AV Time Setup 1 to
1027| 1026| 4| Float| Average Consumpton at Consumption Unit in Display|  | R| Consumption over Time at AVTime Setup
1029| 1028| 4| Float| Gas Temp Min at Temp. Unit in Display since Clear|  | R|
1031| 1030| 4| Float| Gas Temp Max at Temp. Unit in Display since Clear|  | R|
1033| 1032| 4| Float| Gas Temp AV at Temp. Unit in Display|  | R| AV over the Time from AVTime Setup 1 to 1440
1035| 1034| 4| Float| Velocity Min at Velocity Unit in Display since Clear|  | R|
1037| 1036| 4| Float| Velocity Max at Velocity Unit in Display since Clear|  | R|
1039| 1038| 4| Float| Velocity AV at Velocity Unit in Display|  | R| AV over the Time from AVTime Setup 1 to 1440
Modbus Register| Modbus Address| No.of Byte|

Data Type

|

Description

|

Default

| Read Write|

Unit /Comment

---|---|---|---|---|---|---|---
1041| 1040| 4| Float/Dword| Incremented Pulses since setup pulse| x| R|

1043

|

1042

|

4

|

Float/Dword

| Systempressure (at Pressure Unit showed in Display)|

x

|

R

| Value only available with pressure option

1045

|

1044

|

4

|

Float/Dword

| Systempressure Min at Pressure Unit in Display since Clear Min/Max|

x

|

R

| Value only available with pressure option

1047

|

1046

|

4

|

Float/Dword

| Systempressure Max at

Pressure Unit in Display since Clear Min/Max

|

x

|

R

| Value only available with pressure option

1049

|

1048

|

4

|

Uint/Dword

| Total Counter bevore

comma as showed in Display (left side)

|

x

|

R

| only available in Direction Sensor Vaxxxx

1051

|

1050

|

4

|

Float/Dword

| Total Counter after comma as showed in

Display (left side)

|

x

|

R

| only available in Direction Sensor Vaxxxx

1053

|

1052

|

4

|

Uint/Dword

| Total Counter bevore comma as showed in

Display (left side + right side)

|

x

|

R

|

only available in Direction Sensor Vaxxxx

1055

|

1054

|

4

|

Float/Dword

| Total Counter after comma as showed in

Display (left side + right side)

|

x

|

R

|

only available in Direction Sensor Vaxxxx

1057| 1056| 4| Float/Dword| reserved| x| R|
to|  |  |  |  |  |  |
1099| 1078| 4| Float/Dword| reserved| x| R|
Modbus Register| Modbus Address| No.of Byte| Data Type| Description|

Default

| Read Write| Unit /Comment
---|---|---|---|---|---|---|---
1101| 1100| 4| Float| Flow in m³/h|  | R|
1103| 1102| 4| Float| Flow Min in m³/h since last Last Clear Min/Max|  | R|
1105| 1104| 4| Float| Flow Max in m³/h since last Clear Min/Max|  | R|

1107

|

1106

|

4

|

Float

|

Flow AV in m³/h

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1109| 1108| 4| Float| Flow in Nm³/h|  | R|
1111| 1110| 4| Float| Flow Min in Nm³/h since last Clear Min/Max|  | R|
1113| 1112| 4| Float| Flow Max in Nm³/h since last Clear Min/Max|  | R|

1115

|

1114

|

4

|

Float

|

Flow AV in Nm³/h

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1117| 1116| 4| Float| Flow in m³/min|  | R|
1119| 1118| 4| Float| Flow Min in m³/min since last Clear Min/Max|  | R|
1121| 1120| 4| Float| Flow Max in m³/min since last Clear Min/Max|  | R|

1123

|

1122

|

4

|

Float

|

Flow AV in m³/min

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1125| 1124| 4| Float| Flow in Nm³/min|  | R|
1127| 1126| 4| Float| Flow Min in Nm³/min since last Clear Min/Max|  | R|
1129| 1128| 4| Float| Flow Max in Nm³/min since last Clear Min/Max|  | R|

1131

|

1130

|

4

|

Float

|

Flow AV in Nm³/min

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1133| 1132| 4| Float| Flow in ltr/h|  | R|
1135| 1134| 4| Float| Flow Min in ltr/h since last Clear Min/Max|  | R|
1137| 1136| 4| Float| Flow Max in ltr/h since last Clear Min/Max|  | R|

1139

|

1138

|

4

|

Float

|

Flow AV in ltr/h

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

Modbus Register| Modbus Address| No.of Byte|

Data Type

|

Description

|

Default

| Read Write|

Unit /Comment

---|---|---|---|---|---|---|---
1141| 1140| 4| Float| Flow in Nltr/h|  | R|
1143| 1142| 4| Float| Flow Min in Nltr/h since last Clear Min/Max|  | R|
1145| 1144| 4| Float| Flow Max in Nltr/h since last Clear Min/Max|  | R|

1147

|

1146

|

4

|

Float

|

Flow AV in Nltr/h

|  |

R

| AV over the Time from AVTime Setup 1 to 1440 minutes
1149| 1148| 4| Float| Flow in ltr/min|  | R|
1151| 1150| 4| Float| Flow Min in ltr/min since last Clear Min/Max|  | R|
1153| 1152| 4| Float| Flow Max in ltr/min since last Clear Min/Max|  | R|

1155

|

1154

|

4

|

Float

|

Flow AV in ltr/min

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1157| 1156| 4| Float| Flow in Nltr/min|  | R|
1159| 1158| 4| Float| Flow Min in Nltr/min since last Clear Min/Max|  | R|
1161| 1160| 4| Float| Flow Max in Nltr/min since last Clear Min/Max|  | R|

1163

|

1162

|

4

|

Float

|

Flow AV in Nltr/min

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1165| 1164| 4| Float| Flow in ltr/s|  | R|
1167| 1166| 4| Float| Flow Min in ltr/s since last Clear Min/Max|  | R|
1169| 1168| 4| Float| Flow Max in ltr/s since last Clear Min/Max|  | R|

1171

|

1170

|

4

|

Float

|

Flow AV in ltr/s

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1173| 1172| 4| Float| Flow in Nltr/s|  | R|
1175| 1174| 4| Float| Flow Min in Nltr/s since last Clear Min/Max|  | R|
1177| 1176| 4| Float| Flow Max in Nltr/s since last Clear Min/Max|  | R|

1179

|

1178

|

4

|

Float

|

Flow AV in Nltr/s

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1181| 1180| 4| Float| Flow in cfm|  | R|
1183| 1182| 4| Float| Flow Min in cfm since last Clear Min/Max|  | R|
1185| 1184| 4| Float| Flow Max in cfm since last Clear Min/Max|  | R|

1187

|

1186

|

4

|

Float

|

Flow AV in cfm

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

Modbus Register| Modbus Address| No.of Byte|

Data Type

|

Description

|

Default

| Read Write|

Unit /Comment

---|---|---|---|---|---|---|---
1189| 1188| 4| Float| Flow in Ncfm|  | R|
1191| 1190| 4| Float| Flow Min in Ncfm since last Clear Min/Max|  | R|
1193| 1192| 4| Float| Flow Max in Ncfm since last Clear Min/Max|  | R|

1195

|

1194

|

4

|

Float

|

Flow AV in Ncfm

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1197| 1196| 4| Float| Flow in kg/h|  | R|
1199| 1198| 4| Float| Flow Min in kg/h since last Clear Min/Max|  | R|
1201| 1200| 4| Float| Flow Max in kg/h since last Clear Min/Max|  | R|

1203

|

1202

|

4

|

Float

|

Flow AV in kg/h

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1205| 1204| 4| Float| Flow in kg/min|  | R|
1207| 1206| 4| Float| Flow Min in kg/min since last Clear Min/Max|  | R|
1209| 1208| 4| Float| Flow Max in kg/min since last Clear Min/Max|  | R|

1211

|

1210

|

4

|

Float

|

Flow AV in kg/min

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1213| 1212| 4| Float| Flow in kg/s|  | R|
1215| 1214| 4| Float| Flow Min in kg/s since last Clear Min/Max|  | R|
1217| 1216| 4| Float| Flow Max in kg/s since last Clear Min/Max|  | R|

1219

|

1218

|

4

|

Float

|

Flow AV in kg/s

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1221| 1220| 4| Float| Flow in kW|  | R|
1223| 1222| 4| Float| Flow Min in kW since last Clear Min/Max|  | R|
1225| 1224| 4| Float| Flow Max in kW since last Clear Min/Max|  | R|

1227

|

1226

|

4

|

Float

|

Flow AV in kW

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

Modbus Register| Modbus Address| No.of Byte| Data Type|

Description

|

Default

| Read Write|

Unit /Comment

---|---|---|---|---|---|---|---
1269| 1268| 4| UInt32| Consumption m³ before comma| x| R|
1271| 1270| 4| Float| Consumption m³ after comma| x| R|

1273

|

1272

|

4

|

Float

|

Consumption m³ AV

|

x

|

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1275| 1274| 4| UInt32| Consumption Nm³ before comma| x| R|
1277| 1276| 4| Float| Consumption Nm³ after comma| x| R|

1279

|

1278

|

4

|

Float

|

Consumption Nm³ AV

|

x

|

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1281| 1280| 4| UInt32| Consumption ltr before comma| x| R|
1283| 1282| 4| Float| Consumption ltr after comma| x| R|

1285

|

1284

|

4

|

Float

|

Consumption ltr AV

|

x

|

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1287| 1286| 4| UInt32| Consumption Nltr before comma| x| R|
1289| 1288| 4| Float| Consumption Nltr after comma| x| R|

1291

|

1290

|

4

|

Float

|

Consumption Nltr AV

|

x

|

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1293| 1292| 4| UInt32| Consumption cf before comma| x| R|
1295| 1294| 4| Float| Consumption cf after comma| x| R|

1297

|

1296

|

4

|

Float

|

Consumption cf AV

|

x

|

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1299| 1298| 4| UInt32| Consumption Ncf before comma| x| R|
1301| 1300| 4| Float| Consumption Ncf after comma| x| R|

1303

|

1302

|

4

|

Float

|

Consumption Ncf AV

|

x

|

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1305| 1304| 4| UInt32| Consumption kg before comma| x| R|
1307| 1306| 4| Float| Consumption kg after comma| x| R|

1309

|

1308

|

4

|

Float

|

Consumption kg AV

|

x

|

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1311| 1310| 4| UInt32| Consumption kWh before comma| x| R|
1313| 1312| 4| Float| Consumption kWh after comma| x| R|

1315

|

1314

|

4

|

Float

|

Consumption kWh AV

|

x

|

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

Modbus Register| Modbus Address| No.of Byte|

Data Type

|

Description

| Def ault| Read Write|

Unit /Comment

---|---|---|---|---|---|---|---
1347| 1346| 4| Float| Velocity m/s|  | R|
1349| 1348| 4| Float| Velocity Min m/s since last Clear Min/Max|  | R|
1351| 1350| 4| Float| Velocity Max m/s since last Clear Min/Max|  | R|

1353

|

1352

|

4

|

Float

|

Velocity AV m/s

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1355| 1354| 4| Float| Velocity Nm/s|  | R|
1357| 1356| 4| Float| Velocity Min Nm/s since last Clear Min/Max|  | R|
1359| 1358| 4| Float| Velocity Max Nm/s since last Clear Min/Max|  | R|

1361

|

1360

|

4

|

Float

|

Velocity AV Nm/s

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1363| 1362| 4| Float| Velocity Ft/min|  | R|
1365| 1364| 4| Float| Velocity Min Ft/min since last Clear Min/Max|  | R|
1367| 1366| 4| Float| Velocity Max Ft/min since last Clear Min/Max|  | R|

1369

|

1368

|

4

|

Float

|

Velocity AV Ft/min

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1371| 1370| 4| Float| Velocity NFt/min|  | R|
1373| 1372| 4| Float| Velocity Min NFt/min since last Clear Min/Max|  | R|
1375| 1374| 4| Float| Velocity Max NFt/min since last Clear Min/Max|  | R|

1377

|

1376

|

4

|

Float

|

Velocity AV NFt/min

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1419| 1418| 4| Float| GasTemp °C|  | R|
1421| 1420| 4| Float| GasTemp Min °C since Clear Min/Max|  | R|
1423| 1422| 4| Float| GasTemp Max °C since Clear Min/Max|  | R|

1425

|

1424

|

4

|

Float

|

GasTemp AV °C

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

1427| 1426| 4| Float| GasTemp °F|  | R|
1429| 1428| 4| Float| GasTemp Min °F since Clear Min/Max|  | R|
1431| 1430| 4| Float| GasTemp Max °F since Clear Min/Max|  | R|

1433

|

1432

|

4

|

Float

|

GasTemp AV °F

|  |

R

| Average for time period defined in AVTime Setup

„1 to 1440 minutes“

Modbus Register| Modbus Address| No.of Byte|

Data Type

|

Description

| Def ault| Read Write|

Unit /Comment

---|---|---|---|---|---|---|---
1475| 1474| 4| Float| Systempressure mbar| x| R| Value only available with pressure option
1477| 1476| 4| Float| systempressure Min mbar since Clear Min/Max| x| R| Value only available with pressure option
1479| 1478| 4| Float| systempressure Max mbar since Clear Min/Max| x| R| Value only available with pressure option
1481| 1480| 4| Float| Systempressure bar| x| R| Value only available with pressure option
1483| 1482| 4| Float| systempressure Min bar since Clear Min/Max| x| R| Value only available with pressure option
1485| 1484| 4| Float| systempressure Max bar since Clear Min/Max| x| R| Value only available with pressure option
1487| 1486| 4| Float| Systempressure psi| x| R| Value only available with pressure option
1489| 1488| 4| Float| systempressure Min psi since Clear Min/Max| x| R| Value only available with pressure option
1491| 1490| 4| Float| systempressure Max psi since Clear Min/Max| x| R| Value only available with pressure option
Modbus Register| Modbus Address| No.of Byte|

Data Type

|

Description

| Def ault| Read Write|

Unit /Comment

---|---|---|---|---|---|---|---
1533| 1532| 4| UInt| Consumption m³ bevore comma (left side)| x| R|

only available in Direction Sensor VA 509

1535| 1534| 4| Float| Consumption m³ after comma (left side)| x| R
1537| 1536| 4| UInt| Consumption total m³ bevore comma (left side + right side)| x| R
1539| 1538| 4| Float| Consumption total m³ after comma (left side + right side)| x| R
1541| 1540| 4| UInt| Consumption Nm³ bevore comma (left side)| x| R
1543| 1542| 4| Float| Consumption Nm³ after comma (left side)| x| R
1545| 1544| 4| UInt| Consumption total Nm³ bevore comma (left side + right side)| x| R
1547| 1546| 4| Float| Consumption total Nm³ after comma (left side + right side)| x| R
1549| 1548| 4| UInt| Consumption ltr bevore comma (left side)| x| R
1551| 1550| 4| Float| Consumption ltr after comma (left side)| x| R
1553| 1552| 4| UInt| Consumption total ltr bevore comma (left side + right side)| x| R
1555| 1554| 4| Float| Consumption total ltr after comma (left side + right side)| x| R
1557| 1556| 4| UInt| Consumption Nltr bevore comma (left side)| x| R
1559| 1558| 4| Float/| Consumption Nltr after comma (left side)| x| R
1561| 1560| 4| UInt| Consumption total Nltr bevore comma (left side + right side)| x| R
1563| 1562| 4| Float| Consumption total Nltr after comma (left side + right side)| x| R
1565| 1564| 4| UInt| Consumption Cf bevore comma (left side)| x| R
1567| 1566| 4| Floatd| Consumption Cf after comma (left side)| x| R
1569| 1568| 4| UInt| Consumption total Cf bevore comma (left side + right side)| x| R
1571| 1570| 4| Float| Consumption total Cf after comma (left side + right side)| x| R
1573| 1572| 4| UInt| Consumption NCf bevore comma (left side)| x| R
1575| 1574| 4| Float| Consumption NCf after comma (left side)| x| R
1577| 1576| 4| UInt| Consumption total NCf bevore comma (left side + right side)| x| R
Modbus Register| Modbus Address| No.of Byte| Data Type| Description| Def ault| Read Write| Unit /Comment
---|---|---|---|---|---|---|---
1579| 1578| 4| Float/Dword| Consumption total NCf after comma (left side + right side)| x| R|

only available in Direction Sensor VA 509

1581| 1580| 4| UInt/Dword| Consumption kg bevore comma (left side)| x| R
1583| 1582| 4| Float/Dword| Consumption kg after comma (left side)| x| R
1585| 1584| 4| UInt/Dword| Consumption total kg bevore comma (left side + right side)| x| R
1587| 1586| 4| Float/Dword| Consumption total kg after comma (left side + right side)| x| R
1589| 1588| 4| UInt/Dword| Consumption kWh bevore comma (left side)| x| R
1591| 1590| 4| Float/Dword| Consumption kWh after comma (left side)| x| R
1593| 1592| 4| UInt/Dword| Consumption total kWh bevore comma (left side + right side)| x| R
1595| 1594| 4| Float/Dword| Consumption total kWh after comma (left side + right side)| x| R

Remark:

For sensors VA500B / VA520B (bi-directional) applies:

• Values for the “Green” direction can be read from registers: 1000 – 1600.
• Values for the “Blue” direction can be read from registers: 10000 – 11600

Register address for values in direction “Blue” = Register address in direction “Green” + 9000

Example for consumption in m³

• Value for direction “Green” Register Address:1268
• Value for direction “Blue” Register address: 10268 → (1268 +9000 = 10268)

Device settings register

Modbus Settings (2001…2005)

Modbus Register| Modbus Address| No.of Byte| Data Type| Description| Default Setting| Read Write| Unit /Comment
---|---|---|---|---|---|---|---
2001| 2000| 2| UInt16| Modbus ID| 1| R/W| Modbus ID 1…247

2002

| ****

2001

| ****

2

| ****

UInt16

| ****

Baudrate

| ****

4

| ****

R/W

| 0 = 1200

1 = 2400

2 = 4800

3 = 9600

4 = 19200

5 = 38400

6 = 57600

7 = 115200

2003

| ****

2002

| ****

2

| ****

UInt16

| ****

Parity

| ****

1

| ****

R/W

| 0 = none

1 = even

2 = odd

2004| 2003| 2| UInt16| Number of Stopbits|  | R/W| 0 = 1 Stop Bit

1 = 2 Stop Bit

2005

| ****

2004

| ****

2

| ****

UInt16

| ****

Word Order

| ****

0xABCD

| ****

R/W

| 0xABCD = Big Endian 0xCDAB = Middle Endian

Display Settings  (2007…2009)

Modbus Register| Modbus Address| No.of Byte| Data Type| Description| Default Setting| Read Write| Unit /Comment
---|---|---|---|---|---|---|---

2007

| ****

2006

| ****

2

| ****

UInt16

| ****

Display Rotation Auto dimming

| ****

0

| ****

R/W

| bit 0: 0 = 0°, 1 = 180°

bit 1: 0 = Autodimm off 1 = Autodimm on

bit 2 to 7 reserved

bit 8 to 15 Autodimm Time

(max. 240 Minutes)”

2008

| ****

2007

| ****

2

| ****

UInt16

| BackLight Brightness| ****

80

| ****

R/W

| ****

0 to 100%

2009

| ****

2008

| ****

2

| ****

UInt16

| ****

Language

| ****

0

| ****

R/W

| 0 = English

1 = Deutsch

2 = Spanish

3 = French

Device Settings (2021…2063)

Modbus Register| Modbus Address| No.of Byte| ****

Data Type

| ****

Description

| Default Setting| Read Write| ****

Unit /Comment

---|---|---|---|---|---|---|---

2021

| ****

2020

| ****

16

| ****

String

| ****

Sensor Location

| ****

“”

| ****

R/W

|
2029| 2028| 4| Uint32| Calibrated GasType as index| 0| R/W| index to Get Gas Names as String see chapter 7.4

2031

| ****

2030

| ****

4

| ****

Uint32

| ****

GasSubType (only available if Calibrated GasType is Air)

| ****

0

| ****

R/W

| 0 = Air

1 = CO2

2 = N2O

3 = N2

4 = O2

5 = NG

6 = AR

7 = He

8 = H2

9 = C3H8

10 = CH4

2033

| ****

2032

| ****

4

| ****

Uint32

| Index of Length Unit

Unit according Unit Index table

| 64

(mm)

| ****

R/W

|

2035

| ****

2034

| ****

4

| ****

Uint32

| Index of Flow Unit

Unit according Unit Index table

| 14

(m³/h)

| ****

R/W

|

2037

| ****

2036

| ****

4

| ****

Uint32

| Index of Velocity Unit Unit according Unit Index

table

| 10

(m/s)

| ****

R/W

|

2039

| ****

2038

| ****

4

| ****

Uint32

| Index of Consumption Unit according Unit Index table| ****

24 (m³)

| ****

R/W

|

2041

| ****

2040

| ****

4

| ****

Uint32

| Index of Temperature Unit according Unit Index table| ****

1 (°C)

| ****

R/W

|

2043

| ****

2042

| ****

4

| ****

Uint32

| Index of Pressure

Unit according Unit Index table

| 38

(mbar)

| ****

R/W

|

2045

| ****

2044

| ****

4

| ****

Float

| Pipe diameter in length unit

as programmed in Register 2033

|  | ****

R/W

|

2047

| ****

2046

| ****

4

| ****

Float

| Reference Temperature in Unit programmed in Register 2041| ****

20

| ****

R/W

|

2049

| ****

2048

| ****

4

| ****

Float

| Reference Pressure in Unit

programmed in Register 2049

| ****

1000

| ****

R/W

|

2051

| ****

2050

| ****

4

| ****

Float

| System Pressure in Unit

programmed in Register 2049

| ****

5000

| ****

R/W

|

2053

| ****

2052

| ****

4

| ****

Float

| Zero Point of Velocity in Unit programmed in

Register 2037

| ****

0

| ****

R/W

|

2055

| ****

2054

| ****

4

| ****

Float

| Min Velocity in Unit programmed in Register

2037

| ****

0

| ****

R/W

|
2057| 2056| 4| Float| LowPass Filter Time for Flow and Velocity in ms| 100| R/W|

2059

| ****

2058

| ****

4

| ****

Uint32

| Average Time to Build

Average (1 to 1440 minutes)

| ****

60

| ****

R/W

|

2061

| ****

2060

| ****

4

| ****

Float

| HeatRating for Flammable

gases at 0°C / 1013.25mbar

| ****

0

| ****

R/W

|

2063

| ****

2062

| ****

4

| ****

Uint32

| ****

next Cal Date

| CalDat e + 2

Years

| ****

R/W

| ****

UnixTime

Modbus Register| Modbus Address| No.of Byte| ****

Data Type

| ****

Description

| Default Setting| Read Write| ****

Unit /Comment

---|---|---|---|---|---|---|---

2081

| ****

2080

| ****

4

| ****

Float

| ****

Relais Mode as index

| ****

1

| ****

R/W

| 0 = none

1 = Puls

2 = Alarm

2083

| ****

2082

| ****

4

| ****

Float

| ****

Unit Puls from Unit Table

| ****

U_m3

| ****

R/W

| U_m3 U_ltr U_cf

U_kg

2085| 2084| 4| Float| Pulse Value (value where is generated a new puls)| 1| R/W|
2087| 2086| 4| Float| Pulse Polarity| 1| R/W| 0 = neg

1 = pos

2089

| ****

2088

| ****

4

| ****

Float

| ****

Unit Alarm from Unit Table

| ****

U_GRA

D_C

| ****

R/W

| U_m_s U_m3_h U_ltr_s U_cfm U_kg_min U_kg_s U_GRAD_C

U_GRAD_F

2091| 2090| 4| Float| Alarm Value in Unit above| 25| R/W|
2093| 2092| 4| Float| Alarm Hysteresis in Unit above| 1| R/W|
2095| 2094| 4| Float| Alarm at overshot or undershot as index| 1| R/W| 0 = undershot

1 = overshot

2113| 2112| 4| Float| Reset to Factory Defaults|  | W| send Serial Number to this adr. to set factory defaults

2115

| ****

2114

| ****

4

| ****

UInt32

| Consumption at programmed unit above|  | ****

W

| if not locked, value to set consumption
2117| 2116| 4| Float| Reset Min/Max Values|  | W|
2119| 2118| 4| Float| Reset AV Values|  | W|

2121

| ****

2120

| ****

4

| ****

Float

| ****

Temperature Correction Value at unit programmed above

|  | ****

R/W

| Write the actual measured Temperature value to this register

at read the offset to internal temperature is returned

2123| 2122| 4| Float| Set or Clear RemoteControll State|  | R/W| 0 = cleared all other means remote controlled
2125| 2124| 4| Float| User offset pressure|  | R/W| only with pressure option available
2127| 2126| 4| Float| Consumption (left side) at programmed unit above|  | R/W| only available in Direction Sensor VA509

Analog 4…20mA Register

Modbus Register| Modbus Address| No.of Byte| ****

Data Type

| ****

Description

| Default Setting| Read Write| ****

Unit /Comment

---|---|---|---|---|---|---|---

2201

| ****

2200

| ****

4

| ****

UInt32

| ****

4-20mA CH1 Selected Value as index

| ****

1 or 2

| ****

R/W

| 0 = not used 1 = Flow

2 = Velocity

3 = Temperature

2203

| ****

2202

| ****

4

| ****

UInt32

| ****

4-20mA CH1 Unit index from unit table for above selected Value

| ****

U_m3_h (VA520 & VA

U_m_s (VA500 & VA 550)

| ****

R/W

| Flow: U_m3_h,U_Nm3_h,Um3 min,U_Nm3_min,U_ltr_h,U

_Nltr_h,U_ltr_min,U_Nl_mi n,U_ltr_s,U_Nl_s,U_cfm,U

_Ncfm,U_kg_h,U_kg_min, U_kg_s,U_kW

Velocity: U_m_s,U_Nm_s,U_Ft_min

,U_Nft_min Temperature: U_GRAD_C,U_GRAD_F

2205

| ****

2204

| ****

4

| ****

UInt32

| 4-20mA CH1 Auto or Manual Range| ****

0

| ****

R/W

| 0 = AutoRange

1 = Manual Range

2207| 2206| 4| UInt32| 4-20mA CH1 Scale Low| 0| R/W| writable only if Manual Range is selected
2209| 2208| 4| UInt32| 4-20mA CH1 Scale High| Max Speed| R/W| writable only if Manual Range is selected

2211

| ****

2210

| ****

4

| ****

UInt32

| ****

4-20mA CH2 Selected Value as index

| ****

3

| ****

R/W

| 0 = not used 1 = Flow

2 = Velocity

3 = Temperature

2213

| ****

2212

| ****

4

| ****

UInt32

| ****

4-20mA CH2 Unit index from unit table for above selected Value

| ****

U_GRAD_C

| ****

R/W

| Flow: U_m3_h,U_Nm3_h,Um3 min,U_Nm3_min,U_ltr_h,U

_Nltr_h,U_ltr_min,U_Nl_mi n,U_ltr_s,U_Nl_s,U_cfm,U

_Ncfm,U_kg_h,U_kg_min, U_kg_s,U_kW

Velocity: U_m_s,U_Nm_s,U_Ft_min

,U_Nft_min Temperature:

U_GRAD_C,U_GRAD_F

2215| 2214| 4| UInt32| 4-20mA CH2 Auto or Manual Range| -20| R/W| 0 = AutoRange

1 = Manual Range

2217

| ****

2216

| ****

4

| ****

UInt32

| ****

4-20mA CH2 Scale Low

| ****

100

| ****

R/W

| writable only if Manual Range is selected
2219| 2218| 4| UInt32| 4-20mA CH2 Scale High| Max Speed| R/W| writable only if Manual Range is selected

2221

| ****

2220

| ****

4

| ****

UInt32

| ****

4-20mA CH1 and CH2

Current on error as index

|  | ****

R/W

| 0 = is the actual value above 3.8mA or below 20.5mA

1 = 22mA is outputed 2 = 2mA is outputed

2223| 2222| 4| UInt32| 4-20mA number of available channels| 1| R|

ETH Board Register

Modbus Register| Modbus Address| No.of Byte| Data Type| Description| Default Setting| Read Write| Unit /Comment
---|---|---|---|---|---|---|---
3201| 3200| 4| Dword| DHCP on/off| 1| R/W| 1 = DHCP on

0 = DHCP off

3207| 3206| 4| Dword| IP Address 4 Byte| x| R/W| 0xff.0xff.0xff.0xff
3209| 3208| 4| Dword| Subnet Mask 4

Byte

| x| R/W| 0xff.0xff.0xff.0xff
3211| 3210| 4| Dword| Gateway 4 Byte| x| R/W| 0xff.0xff.0xff.0xff
3213| 3212| 4| Dword| DNS Address 4 Byte| x| R/W| 0xff.0xff.0xff.0xff

3215

| ****

3214

| ****

16

| ****

String

| ****

Hostname

| ****

MAC ADR

| ****

R/W

| At factory reset Hostname is VA-MAC Address :

VA-7AD80040xxxx

3223| 3222| 4| Dword| ModBus TCP UI| 1| R/W| ModBus TCP User ID
3225| 3224| 4| Dword| ModBus TCP Port| 502| R/W|
3227| 3226| 4| Dword| ModBus TCP

ByteOrder

| 0xABCD| R/W| Possible values: 0xABCD

or 0xCDAB

MBus Register

Modbus Register| Modbus Address| No.of Byte| Data Type| Description| Default Setting| Read Write| Unit /Comment
---|---|---|---|---|---|---|---
3001| 3000| 4| Dword| Mbus Primary Address| 0x01| R/W| Range 1..255
3003| 3002| 4| Dword| Mbus ID| 0| R/W| Range 0..99999999

3005

| ****

3004

| ****

4

| ****

Dword

| ****

Mbus Medium Index

| ****

0x0E

| ****

R/W

| 0x00 =Other 0x01 = Oil

0x02 = Electricity 0x03 = Gas 0x04 = Heat 0x05 = Steam

0x06 = Hot Water 0x07 = Water 0x08 = H.C.A.

0x09 = Compressed Air 0x0A = C.L.M. – in

0x0B = C.L.M. – out

0x0C = Hot Water Mode 2 0x0D = Water Mode 2

0x0E = Bus / System 0x0F = Reserved

3007

| ****

3006

| ****

4

| ****

Dword

| ****

Mbus Baudrate Index

| ****

0x03

| ****

R/W

| 0x00 = 300

0x01 = 600

0x02 = 1200

0x03 = 2400

0x04 = 4800

0x05 = 9600

3009

| ****

3008

| ****

4

| ****

Dword

| ****

Mbus Manufacturer

| ****

CSI

| ****

R/W

| ((CHAR_1 – 64 ) 1024) + ((CHAR_2 – 64) 32) +

(CHAR_3 – 64)

3011| 3010| 4| Dword| Number of Mbus values| 1| R/W| Range 0..20
3013| 3012| 4| Dword| Index of Value #1| 0| R/W|
3015| 3014| 4| Dword| Unit Index for Value #1| 14| R/W|
3017| 3016| 4| Dword| Index of Value #2|  | R/W|
3019| 3018| 4| Dword| Unit Index for Value #2|  | R/W|
3021| 3020| 4| Dword| Index of Value #3|  | R/W|
3023| 3022| 4| Dword| Unit Index for Value #3|  | R/W|
3025| 3024| 4| Dword| Index of Value #4|  | R/W|
3027| 3026| 4| Dword| Unit Index for Value #4|  | R/W|
to|  |  |  |  |  |  |
3089| 3038| 4| Dword| Index of Value #20|  | R/W|
3091| 3040| 4| Dword| Unit Index for Value #20|  | R/W|

Data format test register (64001… 64003)

Modbus Register| Modbus Address| No.of Byte| Data Type| Description| Default Setting| Read Write| Unit /Comment
---|---|---|---|---|---|---|---
64001| 64000| 4| Dword| 1000000| x| R| format test for Dword
64003| 64002| 4| float| 1000000.0| x| R| format test for float

Gas names

Modbus Register| Modbus Address| No.of Byte| Data Type| Description| Default Setting| Read Write| Unit /Comment
---|---|---|---|---|---|---|---
2501| 2500| 16| String| Gas at index 0| Air| R|
2509| 2508| 16| String| Gas at index 1|  | R|
2517| 2516| 16| String| Gas at index 2|  | R|
2525| 2524| 16| String| Gas at index 3|  | R|
2533| 2532| 16| String| Gas at index 4|  | R|
2541| 2540| 16| String| Gas at index 5|  | R|
2549| 2548| 16| String| Gas at index 6|  | R|
2557| 2556| 16| String| Gas at index 7|  | R|
2565| 2564| 16| String| Gas at index 8|  | R|
2573| 2572| 16| String| Gas at index 9|  | R|
2581| 2580| 16| String| Gas at index 10|  | R|
2589| 2588| 16| String| Gas at index 11|  | R|
2597| 2596| 16| String| Gas at index 12|  | R|
2605| 2604| 16| String| Gas at index 13|  | R|
2613| 2612| 16| String| Gas at index 14|  | R|

Unit Index table

Index| Value| Index| Value| Index| Value| Index| Value
---|---|---|---|---|---|---|---
1| °C| 11| fpm| 21| Nltr/min| 31| atm°C
2| °F| 12| Nm/s| 22| Nltr/s| 32| atm°F
3| %RH| 13| SFPM| 23| SCFM| 33| pa
4| °Ctd| 14| m³/h| 24| m³| 34| hpa
5| °Ftd| 15| m³/min| 25| ltr| 35| kpa
6| mg/kg| 16| ltr/min| 26| cf| 36| Mpa
7| mg/m³| 17| ltr/s| 27| Nm³| 37| mbar
8| g/kg| 18| cfm| 28| Nltr| 38| bar
9| g/m³| 19| Nm³/h| 29| SCF| 39| psi
10| m/s| 20| Nm³/min| 30| ppm| 40| mV
Index| Value| Index| Value| Index| Value| Index| Value
---|---|---|---|---|---|---|---
41| V| 51| AVcf/h| 61| kVAr| 71| ltr/h
42| µV| 52| kg/h| 62| –| 72| Nltr/h
43| kV| 53| kg/min| 63| €| 73| lb/h
44| mA| 54| Ohm| 64| cts/m³| 74| lb/min
45| A| 55| Hz| 65| W| 75| lb/s
46| kg/s| 56| %| 66| Wh| 76| t/h
47| kg| 57| kW| 67| h| 77| t
48| AVm³/h| 58| kWh| 68| dB| 78| lb
49| AVl/h| 59| PCS| 69| mm| 79| SCFH
50| AVkg/h| 60| kVA| 70| inch| 80| cfh

Index

| ****

Value

| ****

Index

| ****

Value

| ****

Index

| ****

Value

| ****

Index

| ****

Value

---|---|---|---|---|---|---|---
81| g/s|  |  |  |  |  |
82| g/min|  |  |  |  |  |
83| m|  |  |  |  |  |
84| ft|  |  |  |  |  |
 |  |  |  |  |  |  |

Appendix

APPENDIX A – Exception codes

The VA 5xx Modbus uses the following exception codes when responding to the master

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