QM6375L Us er Ma nual
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Sha nghai hitdo Industrial Co., Lt
d TRANBALL Brand Division Page6
Communication Protocol
The product uses RS485 MODBUS-RTU standard protocol format, all operation or reply commands
are hexadecimal data. The default device address is 1 when the device is shipped, the default baud rate is
9600, 8, n, 1
1. Read Data (Function id 0x03)
Inquiry frame (hexadecimal), sending example: Query 1# device 1 data, the host computer sends the
command:01 03 00 00 00 07 04 08 .
Device ID
Function id
Start Address
Data Length
CRC16
01
03
00 00
00 07
04 08
For the correct query frame, the device will respond with data:01 03 0E 00 7F 00 00 00 00 00 00 00 00
00 00 00 00 44 2A , the response format is parsed as follows:
Device
ID
Function
id
Data
Length
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
01
03
0E
00 79
00 7A
00 7B
00 7C
00 7D
00 7E
Data Description: The data in the command is hexadecimal. Take data 1 as an example. 00 79 is
converted to a decimal value of 121. If the data magnification is 100, the actual value is 121/100=1.21.
Others and so on.
2. Data Address Table
Address
Start Address
Description
Data type
Value range
40001
00 00
conductivity
Read Only
0~65535
40002
00 01
temperature
Read Only
0~65535
