111
ATW Modbus Table
Communication Data Formats
1. Single character data format (Total 10 bits)
Communication parameters
Description
Baud rate
9600
Data bits
8
Check bit
None
Stop bit
1
Start bit
1,one frame command finished, using CRC to check
Function code
Inquiry: 03H. Control: 06H/ 10H
Unit address
1-32
START
b1
b2
b3
b4
b5
b6
b7
b8
STOP
Start bit
Data bit
Stop bit
2. Data frame format definition
Device address
Function code
Data
CRC verification
8 bits
8 bits
N*8bits
16 bits
Attention: In order to avoid data detection errors caused by the frame length being too long, the total length of a
data frame in query, setting, and response is controlled within 50 bytes.
ATW Modbus point table
Protocol address: 0000-0149 (R—Read Only, R/W—Read and Write)
Address
Content
Point type
Description
0000
Factory ID
R
Two-digit ASCII character factory code, ID: “HE”
0001
Version
R
Current program version, Send Value=Actual value*10
This version is the version number of our program
0002
Operation hours
R
16-bit cycle running time; Return to 0 when booting.
Unit: “minute”
0003
Heat machine label
R
16-digit unique code, each model has a code, not a serial
number, which is set by the project.
The default is 0.
0004
Unit ON/OFF
R/W
0: Power off; 1: Power on
0005
Operating mode
R/W
0: Heating; 1
:
Cooling
0006
Set water temperature
R/W
Unit: °C Send Value= Actual value *10 int16,16 positive
numbers
0007
Water inlet temperature
R
Unit: °C Send Value = Actual value *10 int16,16 numbers with
positive and negative
0008
Water outlet temperature
R
Unit: °C Send Value = Actual value *10 int16,16 numbers with
positive and negative
0009
Operating current
R
Unit
:
A Send Value = Actual value *10 int16, 16 positive
numbers
