DELTA uno Lite Modbus User Guide

DELTA uno Lite Modbus

Revision

Overview

UNOlite is an indoor air quality monitor to measure the space temperature / humidity / CO2 / PM2.5 / PM10 / PM1 / TVOC and expose the measurements directly onto a BACnet MS/TP or Modbus RTU network. Moreover, the measurements are also accessible with UNO apps through BLE or UNO web through Wi-Fi (Wi-Fi model). Please refer to UNOlite official website for more information. This document is primarily concerned how to add UNOlite to Modbus/RTU network.

Hardware Interface

Buttons

Factory reset

| After booting, press this button three times within 2 seconds will trigger factory reset. The values below will be restored to default:

s   Modbus baudrate

s   BACnet saved mac address

s   Wi-Fi MQTT broker setting (Wi-Fi model)

NOTE: /t’s recommended to use a paper clip to press the keys.

Terminal block

specification.
V-| Power input. For more information, please refer to production specification.
A+| RS485(+) data pin. For Modbus/BACnet network.
B-| RS485(-) data pin. For Modbus/BACnet network.
__

GND

| Ground terminal. Each RS485 driver in an installation is recommended to connect to the same ground to get a common reference.

DIP switch

__

7

| BACnet mode switch. ON : BACnet mode OFF : Modbus mode|  | __

n

8| RS485 terminator resistor (120 ohm)|  | n

NOTE The dips should be adjusted to proper position in power off state. Adjust the dips, then power on device.

Modbus Mode
UNOlite follows Modbus over serial line specification and will run on Modbus/RTU mode if the 7th pin is set to OFF state. The definition of the dips in Modbus mode as listed below:

• NOTE: The definitions of dip are different from Modbus mode. Please make sure which mode is chosen.
• NOTE: Pin6 is not defined in Modbus mode

Serial Configuration

UNOlite can directly connect to a controller with RS485 interface, up to 32 UNOlite devices can be joined to a Modbus serial bus.

NOTE: Suggestion to use 22AWG shielded twisted pair cable to connect devices in sequence

Default Serial Configuration:

• Baud: 9600
• Data-Bit: 8
• Parity: None
• Stop-Bit: 1

Note: perform factory reset to restore default value if the configuration is missing

Modbus Slave Address
The DIP pins 1~5 represent for binary number 0~31, pin 1 is most significant bit (MSB) and pin 5 is least significant bit (LSB). Notice that Modbus slave address starts from 208, therefore, UNOlite can be configured address from 208 to 239:

Modbus Slave Address Table

DIP pin| Modbus Slave

Addr

|  | DIP pin| Modbus Slave

Addr

---|---|---|---|---
1| 2| 3| 4| 5| 1| 2| 3| 4| 5
↓| ↓| ↓| ↓| ↓| 208 (0xD0)| ↑| ↓| ↓| ↓| ↓| 224 (0xE0)
↓| ↓| ↓| ↓| ↑| 209 (0xD1)| ↑| ↓| ↓| ↓| ↑| 225 (0xE1)
↓| ↓| ↓| ↑| ↓| 210 (0xD2)| ↑| ↓| ↓| ↑| ↓| 226 (0xE2)
↓| ↓| ↓| ↑| ↑| 211 (0xD3)| ↑| ↓| ↓| ↑| ↑| 227 (0xE3)
↓| ↓| ↑| ↓| ↓| 212 (0xD4)| ↑| ↓| ↑| ↓| ↓| 228 (0xE4)
↓| ↓| ↑| ↓| ↑| 213 (0xD5)| ↑| ↓| ↑| ↓| ↑| 229 (0xE5)
↓| ↓| ↑| ↑| ↓| 214 (0xD6)| ↑| ↓| ↑| ↑| ↓| 230 (0xE6)
↓| ↓| ↑| ↑| ↑| 215 (0xD7)| ↑| ↓| ↑| ↑| ↑| 231 (0xE7)
↓| ↑| ↓| ↓| ↓| 216 (0xD8)| ↑| ↑| ↓| ↓| ↓| 232 (0xE8)
↓| ↑| ↓| ↓| ↑| 217 (0xD9)| ↑| ↑| ↓| ↓| ↑| 233 (0xE9)
↓| ↑| ↓| ↑| ↓| 218 (0xDA)| ↑| ↑| ↓| ↑| ↓| 234 (0xEA)
↓| ↑| ↓| ↑| ↑| 219 (0xDB)| ↑| ↑| ↓| ↑| ↑| 235 (0xEB)
↓| ↑| ↑| ↓| ↓| 220 (0xDC)| ↑| ↑| ↑| ↓| ↓| 236 (0xEC)
↓| ↑| ↑| ↓| ↑| 221 (0xDD)| ↑| ↑| ↑| ↓| ↑| 237 (0xED)
↓| ↑| ↑| ↑| ↓| 222 (0xDE)| ↑| ↑| ↑| ↑| ↓| 238 (0xED)
↓| ↑| ↑| ↑| ↑| 223 (0xDF)| ↑| ↑| ↑| ↑| ↑| 239 (0xEF)

Modbus Read Data

UNOlite supports function code both 0x03 and 0x04 to read following registers

• 0x03: read holding registers

• 0x04: read input registers
  Request

  Slave Address

1 byte

| Function code

1 byte

| Register

2 bytes

| Length [N]

2 bytes

| CRC16

2 bytes

Response
Slave Address

1 byte

| Function code

1 byte

| Count [2*N]

1 byte

| Data

N * 2 bytes

| CRC16

2 bytes

Sensor Measurement

Register| Name| Description

30001

|

0x0000

|

IAQ index

| Give an index according to current PM2.5, PM10, and CO2 concentration. The index also be referenced by IAQ LED:

GREEN: 0~80 YELLOW: 81~100 RED: 101~400 PURPLE: 401~

30002| 0x0001| Concentration of PM2.5| Unit: μg/m3
30003| 0x0002| Concentration of PM10| Unit: μg/m3
30004| 0x0003| Concentration of carbon

dioxide (formula CO2)

| Unit: ppm
30005| 0x0004| Concentration of total volatile

organic compound (TVOC)

| Unit: ppb
30006| 0x0005| Concentration of total volatile

organic compound (TVOC)

| Unit: μg/m3 (factor 1 ppb = 4.5 μg/m3)
30009| 0x0008| Humidity| Unit: 0.01%
30011| 0x000A| Celsius temperature| Real Temp = (Value – 4500) * 0.01

Unit: °C

30018| 0x0011| Fahrenheit temperature| Real Temp = (Value – 4500) * 0.01

Unit: °F

Sensor State

Register| Name| Description

30033

|

0x0020

|

PM2.5 sensor

|

State of sensor hardware module 0x0000: Power off or does not exist 0x0001: Sensor Ready

0x0002: Warming up 0x0003: Busy 0x00FE: CSERROR

0x00FF: FAIL

30034

|

0x0021

|

PM10 sensor

30035

|

0x0022

|

CO2 sensor

30036

|

0x0023

|

TVOC sensor

30037

|

0x0024

|

Humidity sensor

30038

|

0x0025

|

Temperature sensor

30042

|

0x0029

|

PM1 sensor

30044

|

0x002B

|

IAQ LED state

| 0x0000: LED off

0x0001: LED on

Device Information

Register| Name| Description

30145

| 0x0090-

0x009F

| Model and Product Serial Number| An ASCII string consists model name and serial

number, separated by a comma. For example: “UNO-L,2250L01F9999”

30209| 0x00D0| Main firmware version| Number 1 to 65535

0x0000: device is initializing

30257| 0x0100-

0x0102

| BT MAC address| 6 groups of two hexadecimal digits, e.g.

F2:11:8F:36:F6:93

30260| 0x0103-

0x0105

| WIFI MAC address| 6 groups of two hexadecimal digits

Modbus Write Command

UNOlite supports function code 0x06 and 0x10 to write request

0x06: write single register

Request

Address

1 byte

| Function code

1 byte

| Register

2 bytes

| Data

2 bytes

| CRC16

2 bytes

Response
Address

1 byte

| Function code

1 byte

| Register

2 bytes

| Data

2 bytes

| CRC16

2 bytes

0x10: write multiple registers

Request

Address

1 byte

| Fn. Code

1 byte

| Register

2 bytes

| Length[N]

2 bytes

| Count[2*N]

1 byte

| Data

N * 2 bytes

| CRC16

2 bytes

Response
Address

1 byte

| Function code

1 byte

| Register

2 bytes

| Length [N]

2 bytes

| CRC16

2 bytes

Modbus Examples

1. Read all sensor status from device 208 (0xD0)
   Request| D0 03 00 20 00 0B 17 86
   ---|---
   Response| D0 03 16 00 01 00 01 00 01 00 01 00 01 00 01 00 FE 00 FE 00 FF 00

00 00 01 60 8F

2. Read firmware version from device 208 (0xD0)
   Request| D0 03 00 D0 00 01 97 B2
   ---|---
   Response| D0 03 02 00 04 45 95
3. Set rs485 serial configuration, 115200-8-N-1
   Request| D0 10 00 60 00 03 06 00 01 C2 00 84 00 BB 56
   ---|---
   Response| D0 10 00 60 00 03 92 57

Modbus Exception Response

If device receives a request message without a communication error, but cannot handle the query. It will reply with requested function code plus 0x80. Example, function code 0x3 becomes 0x83

Response format

Address 1 byte| Function code 1 byte| Code 1 bytes| CRC16

2 bytes

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

Code list

Note: Please refer to “ModbUs Application_Protocol_V1_1b3” from www.modbus.org

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