LevelPro RS485 Submersible Level Sensor Instruction Manual

: August 16, 2024
: LevelPro

Table of Contents

LevelPro RS485 Submersible Level Sensor
Product Usage Instructions
PRODUCT OVERVIEW
Hardware Interface
Communication Protocol
Register Definition Table
Examples of Common Commands
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Download This Manual (PDF format)

LevelPro RS485 Submersible Level Sensor

Specifications

Product Name: 100 Series Submersible Level Sensor RS485
Sensing Diaphragm: Ceramic
Communication Interface: RS485
Register Types: Read/Write
Data Types: Unsigned Integers, Signed Integers, Single Precision Floating Point
Value Ranges: Vary based on register type

Product Usage Instructions

Hardware Interface
Connect the level sensor to the designated hardware interface following the provided pin configuration.

Communication Protocol
Follow the specified command formats to read or write data from/to the sensor:

Read Command Format (03 Function Code)

Example:

Address: 0x01
Function Code: 0x03

2.2 Write Command Format (06 Function Code)

Example:

Address: 0x01
Function Code: 0x06

Frequently Asked Questions

Q: Can I change the baud rate of the sensor?
A: Yes, you can change the baud rate by writing to the ‘Baud Rate’ register with the desired value.

Q: What is the default check bit setting?
A: The default check bit setting is ‘No Check’ (0).

100 Series Submersible Level Sensor
RS485 Manual

Read the user’s manual carefully before starting to use the unit.
Producer reserves the right to implement changes without prior notice.

PRODUCT OVERVIEW

Hardware Interface

This protocol complies with the MODBUS communication protocol and adopts the subset RTU mode in the MODBUS protocol. Serial data format:
Serial port Settings (default): no check, 8-bit data, 1-bit stop bit.

Example : 9600,N,8,1
Meaning : 9600 BPS, no parity,8 data bits,1 stop bit.
Baud rate : (1200, 2400, 4800, 9600, 19200, 38600, 57600, 115200)bps, default setting 9600 CRC check : 0xA001.

All the data in the process of data communication are processed according to double-byte signed integer data. If the data is identified as a floating point number, the decimal point needs to be read to determine the size of the data, and the single precision floating point data is increased. RS485 half duplex working mode

Communication Protocol

Read Command Format (03 Function Code)

Example for Read Command Format

Address

|

Function Code

Low Byte

(L)

| CRC16

High Byte (H)

---|---|---|---|---|---|---|---
0x01| 0x03| 0x00| 0x00| 0x00| 0x01| 0x84| 0x0A

Example for Read Command Return Format

Address

|

Function Code

|

Data Length

| Return Data High Byte (H)| Return Data Low Byte (L)| CRC16

Low Byte

(L)

| CRC16

High Byte (H)

---|---|---|---|---|---|---
0x01| 0x03| 0x02| 0x00| 0x01| 0x79| 0x84

Write Command Format (06 Function Code)

Example for Write Command Format

Low Byte

(L)

| CRC16

High Byte (H)

---|---|---|---|---|---|---|---
0x01| 0x06| 0x00| 0x00| 0x00| 0x02| 0x08| 0x0B

Example for Write Command Return Format

Low Byte

(L)

| CRC16

High Byte (H)

---|---|---|---|---|---|---|---
0x01| 0x06| 0x00| 0x00| 0x00| 0x02| 0x08| 0x0B

Error and Exception Command Reply Return Data Format

Address| Function Code| Exception Code| CRC16

Low Byte

(L)

| CRC16

High Byte (H)

---|---|---|---|---
0x01| 0x08 + Function Code| 0x01 : (Illegal FunctionCode) 0x02 : (Illegal Data Address) 0x03 : (Illegal Data)| |

Register Definition Table

Register Name

| ****

Data Type

| Register Offset

Address

| ****

Register Type

| ****

Note

---|---|---|---|---
(Dec)| (Hex)

Slave Address

| ****

Unsigned Integers

| ****

0

| ****

0x0000

| ****

Read/Write

| ****

Value Range: (1~255)

Baud Rate

| ****

Unsigned Integers

| ****

1

| ****

0x0001

| ****

Read/Write

| ****

Value Range : (0~7)

0-1200 ; 1-2400

2-4800 ; 3-9600

4-19200 ; 5-38400

6-57600 ; 7-115200

Unit

| ****

Unsigned Integers

| ****

2

| ****

0x0002

| ****

Read/Write

| Value Range : (0~8)

0-Mpa (0C) ; 1-Kpa

1-2-pa ; 3-Bar

4-mbar ; 5-kg/cm2 6-Psi ; 7-mh2o

8-mmh2o

Decimal| Unsigned Integers| ****

3

| ****

0x0003

| ****

Read/Write

| ****

Value Range : (0~3)

0-#### ; 1-###.#

2-##.## ; 3-#.###

1 : Temperature

0: No Check

1: Odd Check

2: Even Check

---|---|---|---|---|---
Data Size Side| Unsigned Integers| 11| 0x000B| Read/Write Validation| Value Range : (0~1)

Note : Only for Measure- ment output values, other registers default to big endian mode

0: big endian mode (High Byte before)

1: Little endian mode (Low Byte in Before)

13

| 0x000D| Read/Write Validation| Value Range : (0~4)

Factors of Gain

| ****

Signed Integers

| ****

14

0055H: Pressure Reset (Zero to Zero)

00AAH: Factory Data Reset

Cautions

Communication-related parameters, address, baud rate, check bit, will take effect immediately after modifica-tion, and switch quantity related parameters will take effect after sending save instructions.
When the Address is modified, the data will be replied with the address before modification, and the address will be automatically modified after the reply.
The save and restore factory command will return as is, indicating that the transmitter has accepted the com-mand from the host.
When recovering the factory data, pay attention to the possibility that the parameters saved by the factory are inconsistent with those saved by the user, so the address, baud rate and calibration data may be inconsistent, so the transmitter must be searched again after recovering the factory parameters.
This protocol stipulates that the data are communicated with integer data, for example, the main variable data is 6.000MPa, three decimal numbers, and the data of the main variable is 6.000 mpa. The number read is 6000, and then you have to calculate the decimal place to get 6.000, for example, the decimal place is 3, which means 6000/10(3), which is 6000 divided by 10 to the third power, and you get 6.000.

Examples of Common Commands

(Example data are hexadecimal, Address is 1)

Read the main variable data:
- Send instruction: 01 03 00 04 00 01 C5
- Return data: 01 03 02 00 0A 38 43 (0x000A is the value read from the main variable)

Read the number of decimal places:
- Send instruction: 01 03 00 03 00 01 74
- Return data: 01 03 02 00 00 F8 45 (0x0003 refers to decimal places)

Read the transmitter address:
- Send command: 01 03 00 00 00 01 84 0A
- Return data: 01 03 02 0001 79 84 (0x0001 reads the transmitter address)
Read the transmitter baud rate:
- Send command: 01 03 00 01 00 01 D5 CA
- Return data: 01 03 02 0003 F8 45 (0x0003 is read transmitter baud rate, pass
  According to the data description list, the baud rate is 9600.
Modify the transmitter address: (the original address of the transmitter is 0x01, modified to 0x02)
- Send command: 01 06 00 00 00 02 08 0B
- Return data: 01 06 00 00 0002 08 0B (0 x0002 is the modified transmitter address)
Modify the baud rate of transmitter: (the original baud rate of transmitter is 9600, modified to 4800)
- Send command: 01 06 00 01 00 02 59 CB
- Return data: 01 06 00 01 0002 59 CB (0x0002 is to modify the transmitter baud rate, The baud rate is 4800.)

Note: After modifying the command, it is necessary to send the save to user area command,otherwise the modified data will be lost because it is not saved after the transmitter fails to power down.
The command to save to the user area is as follows: Save command code after the address is changed from 1 to 2

Send command: 02 06 00 0F 00 00 B9 FA
Return data: 02 06 00 0F 0000 B9 FA (0x0000 is the save function code, which means save to the user area)

24-0172 © Icon Process Controls Ltd.