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8.1. RS-232 interface
The RS-232 interface uses automatic identification. Parameter settings are as follows:
Baud: 4800~19200 bits/second
Data bits: 8
Stop bits:1
Handshake: None
Parity: None
List of commands
Item
Input / output
Content of "#"
Remarks
Set the equipment parameters
Set
temperature
out_sp_00 ####
Decimal number
Unit:0.01
℃
Set CO
2
density out_sp_01 ###
Decimal number
Unit: 0.01%
Timing sending once every 5 seconds
Status
prs ## ## ##
Decimal number
Eg: prs 2229 2220 111 means
current chamber temperature
22.29
℃
, door temperature
22.20
℃
, CO
2
density 11.1%.
8.2. RS-485 interface
The modbus protocol uses 16-bit registers for data transmission with RS-485 serial port. Data that use
more than 16 bits must be divided into several register. For values that are divided into several
registers, the registers are arranged according to the Modbus format.
Function codes
Name
Code (Hex.)
Read Holding Registers
03
Write Single Register
06
Read Input Register
04
Holding register
Register address
(DEC.)
Explanation
Data type
Remark
Read or write
40001
Baudrate
Int
0:4800
1:9600
2:19200
3:38400
Read and
write
40002
Set temperature
Int
Unit:0.1
℃
Read and
