5 MODBUS ASCII Protocol
8
FY400/600/700/800/900 COMMUNICATION MANUAL
5.6 Abnormal
Code
Abnormal Code Contents
01 (30H 31H)
Illegal function code (Non-existent function code)
02 (30H 32H)
Illegal register address (Register address is out of range)
03 (30H 33H)
Illegal data value (Data value is out of setting range)
5.7 Message example of ASCII mode
z
Reading ( Read PV from slave controller 1)
Request message from master instrument:
Header
(3AH)
ID Number
(30H 31H)
Function
Code
(30H 33H)
Register Address
(30H 30H 38H 41H)
Data Count
(30H 30H 30H 31H)
LRC
(37H31H)
Delimiter
(0DH 0AH)
Response data from slave controller in normal status (Assumed PV=100.0)
Header
(3AH)
ID Number
(30H 31H)
Function
Code
(30H 33H)
Byte Count
(30H32H)
Data
(30H 33H 45H 38H)
LRC
(30H 46H)
Delimiter
(0DH 0AH)
Response from slave controller in abnormal status (Assumed as illegal data value)
Header
(3AH)
ID Number
(30H 31H)
Function
Code
(38H 33H)
Error Code
(30H 33H)
LRC
(37H 39H)
Delimiter
(0DH 0AH)
5.7.1
Setting (Set SV = 10.0 to slave controller 1)
Request message from master instrument:
Header
(3AH)
ID Number
(30H 31H)
Function
Code
(30H 36H)
Register Address
(30H 30H 30H 30H)
Data
(30H 30H 36H 34H)
LRC
(39H35H)
Delimiter
(0DH 0AH)
Response message from slave controller in normal status (When SV = 10.0)
Header
(3AH)
ID Number
(30H 31H)
Function
Code
(30H 36H)
Register Address
(30H 30H 30H 30H)
Data
(30H 30H 36H 34H)
LRC
(39H35H)
Delimiter
(0DH 0AH)
