Page 07 KKAI808PE01-A/0-20130904
11. Simple Problem Shooting
Display Message
Display HHHH
Display LLLL
Shooting Method
Input disconnect or over upper limit, please check input signal, FH value and ambient working temperature.
Input disconnect or under lower limit, please check input signal, FL value and ambient working temperature.
11.Communication
AI808P series adjustor follow Modbus RTU communication protocol, and it can run RS485 half-duplex communication.Read
function code is 0x03, write function code is 0x10, 16-bit CRC checking is applied. The coulometer can not return error message.
Start bit
Data bit
Stop bit
Check bit
1
8
2
None
Data Frame flag:
1. Read Multiple Registers
For example: The host computer read the float number AL1 (The value of Alarm 1 is 15.4).The address code of AL1 is 0x0000,
for AL1 is float number (4bits), it will occupy 2 data register. Reference IEEE-574 standard the hexadecimal 16 result of the
decimal float number is
0x41766666
.
Request from the host computer (Read Multiple Registers)
1
2
3
4
5
6
7
8
Unit Address
Function code
Start
Address Hi
Start
Address Lo
Data
length Hi
Data
length Lo
CRC code Lo
CRC code Hi
0x01
0x03
0x00
0x00
0x04
0xE5
0xC9
0x02
Model AI808P-16/AI808P-80
Accuracy 0.3%FS±3digits 25
Temperature excursion: 0.01%FS/
AI808P Series Temperature Adjustor
Note: If there is any change, please subject to the drawing on the meter!
Model AI808P-4
Accuracy 0.3%FS±3digits 25
Temperature excursion: 0.01%FS/
AI808P Series Temperature Adjustor
Model AI808P-7
Accuracy 0.3%FS±3digits 25
Temperature excursion: 0.01%FS/
AI808P Series Temperature Adjustor
