The Modbus OrganizationThe Modbus Organization
User Guide for DELTA models including: uno Lite Modbus, uno Lite, Modbus
4 【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:
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DocumentDocumentModbus User Guide
VER 0.1
Revision
Date 2022/ 11 / 11
Version 0.1
Description Initial Version
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.
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Hardware Interface
Key
Description
Hardware reset
Push this button will trigger a power cycle.
Factory reset
After booting, press this button three times within 2 seconds will trigger factory reset. The values below will be restored to default:
Modbus baudrate BACnet saved mac address Wi-Fi MQTT broker setting (Wi-Fi model)
NOTE: It's recommended to use a paper clip to press the keys.
2
Terminal V+ VA+ BGND
Description
Power input. For more information, please refer to production specification.
Power input. For more information, please refer to production specification.
RS485(+) data pin. For Modbus/BACnet network.
RS485(-) data pin. For Modbus/BACnet network.
Ground terminal. Each RS485 driver in an installation is recommended to connect to the same ground to get a common reference.
DIPs
Description
ON OFF
1 - 6
Refer to the later sections for the definition of each pin
BACnet mode switch.
7
ON : BACnet mode
OFF : Modbus mode
8
RS485 terminator resistor (120 ohm)
NOTE: The dips should be adjusted to proper position in power off state. Adjust the dips, then power on device.
3
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:
DIP
Description
ON OFF
1
Modbus slave address (check address table)
2
Modbus slave address (check address table)
3
Modbus slave address (check address table)
4
Modbus slave address (check address table)
5
Modbus slave address (check address table)
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
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Default Serial Configuration: Baud: 9600 Data-Bit: 8 Parity: None Stop-Bit: 1 Note: perform factory reset to restore default value if 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:
DIP pin
Modbus Slave
DIP pin
Modbus Slave
1 2345
Addr
1 2345
Addr
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)
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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
Function code
Register
Length [N]
CRC16
1 byte
1 byte
2 bytes
2 bytes
2 bytes
Response
Slave Address
Function code
Count [2*N]
Data
CRC16
1 byte
1 byte
1 byte
N * 2 bytes
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: g/m3
30003 0x0002 Concentration of PM10
Unit: g/m3
30004 30005 30006
0x0003 0x0004 0x0005
Concentration of carbon dioxide (formula CO2)
Unit: ppm
Concentration of total volatile organic compound (TVOC)
Unit: ppb
Concentration of total volatile organic compound (TVOC)
Unit: g/m3 (factor 1 ppb = 4.5 g/m3)
30009 0x0008 Humidity
Unit: 0.01%
30011 0x000A Celsius temperature 30018 0x0011 Fahrenheit temperature
Real Temp = (Value - 4500) * 0.01 Unit: °C Real Temp = (Value - 4500) * 0.01 Unit: °F
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30020 0x0013 Concentration of PM1
Unit: g/m3
Register
Name
30033 0x0020 PM2.5 sensor
Sensor State
Description
30034 0x0021 PM10 sensor 30035 0x0022 CO2 sensor 30036 0x0023 TVOC sensor 30037 0x0024 Humidity sensor 30038 0x0025 Temperature 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
30042 0x0029 PM1 sensor 30044 0x002B IAQ LED state
0x0000: LED off 0x0001: LED on
Device Information
Register
Name
30145
0x0090- Model and Product Serial 0x009F Number
30209 0x00D0 Main firmware version
30257 30260
0x01000x0102 0x01030x0105
BT MAC address WIFI MAC address
Description An ASCII string consists model name and serial number, separated by a comma. For example: "UNO-L,2250L01F9999" Number 1 to 65535 0x0000: device is initializing 6 groups of two hexadecimal digits, e.g. F2:11:8F:36:F6:93
6 groups of two hexadecimal digits
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Modbus Write Command
UNOlite supports function code 0x06 and 0x10 to write request
0x06: write single register
Address 1 byte
Function code 1 byte
Address 1 byte
Function code 1 byte
Request Register 2 bytes Response Register 2 bytes
Data 2 bytes
Data 2 bytes
CRC16 2 bytes
CRC16 2 bytes
0x10: write multiple registers
Address 1 byte
Fn. Code 1 byte
Register 2 bytes
Address 1 byte
Function code 1 byte
Request Length[N]
2 bytes Response
Register 2 bytes
Count[2*N]
Data
1 byte
N * 2 bytes
CRC16 2 bytes
Length [N] 2 bytes
CRC16 2 bytes
Device Information
Register
Name
40012 0x000B Temperature calibration
40097
0x00600x0062
Serial configuration
Description
0~9998: directly set Celsius temperature from
0°C to 99.98°C
9999: reset to default
Data format:
1st word
2nd word
0x60
0x61
First 4 bytes are baud:
3rd word 0x62
1200 2400 4800 9600
19200 38400 57600 115200 (bps)
0x62 format:
3rd word
Hi byte
Lo byte
Bit7-4 Bit3-0 Bit7-4 Bit3-0
Databit Parity Stopbit Presets
Databit:
0x8 (RTU)
8
40215 0x00D6 UNOlite operation
Parity: 0x0 (Even) 0x1 (Odd) 0x04 (None)
Stopbit: 0x0(1 bit) 0x1(2 bits)
Preset: other parameters are ignored if preset bits is assigned.
0: Use baud/databit/parity/stopbit params. 1: 9600 8 N 1 (default) 2: 9600 8 N 2 3. 9600 8 E 1 4. 19200 8 N 1 5: 19200 8 N 2 6: 19200 8 E 1 Data Examples (hexadecimal): [00 00 25 80 84 10]: set to 9600 8 N 2 [00 00 00 00 00 02]: set to 9600 8 N 2 0x0010: perform factory reset (equivalent to press function key 3 times)
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
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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
Address 1 byte
Function code 1 byte
Code 1 bytes
CRC16 2 bytes
Code
Name
0x01
ILLEGAL FUNCTION
0x02
ILLEGAL DATA ADDRESS
0x03
ILLEGAL DATA VALUE
0x04
SERVER DEVICE FAILURE
0x05
ACKNOWLEDGE
0x06
SERVER DEVICE BUSY
0x08
MEMORY PARITY ERROR
0x0A
GATEWAY PATH UNAVAILABLE
0x0B
GATEWAY TARGET DEVICE FAILED TO RESPOND
Note: Please refer to "Modbus_Application_Protocol_V1_1b3" from www.modbus.org
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