Xinje XL Series - Page 260

259
E.g.: Byte 0X5B will be encoded as two characters: 0x35 and 0x42(ASCII code 0x35 ="5"
，
0x42 ="B" ).
ASCII mode frame check domain
：
Longitudinal Redundancy Checking (LRC)
ASCII mode frame description:
Start mark
Modbus no.
Function code
data
LRC
End mark
1 character
2 characters
2 characters
0~252*2
characters
2 characters
2 characters
0x3A
0x0D
0x0A
Format：
STX (3AH)
Start mark=3AH
Address code high bit
Communication position(no)
：
Consist of 2 ASCII codes
Address code low bit
Function code high bit
Function code(command)：
Consist of 2 ASCII codes
Function code low bit
Instruction start ID
Command start bit：
Consist of 4 ASCII codes
Instruction start ID
Instruction start ID
Instruction start ID
Data length
Length from start to end：
Consist of 4 ASCII codes
Data length
Data length
Data length
LRC check high bit
LRC check code：
Consist of 2 ASCII codes
LRC check low bit
END high bit
End mark
：
END Hi=CR(0DH)，END Lo=CR(0AH)
END low bit
2. Communication address
：
00H
：
All Xinje XC series PLC broadcast—— slave stations do not response.
01H
：
Communicate with address 01H PLC.
0FH
：
Communicate with address 15H PLC.
10H
：
Communicate with address 16H PLC.
And so on, up to 254(FEH).
3. Function and DATA
：
Function
code
Function
Corresponding modbus
01H
Read coil
COLR
02H
Read input coil
INRR
03H
Read register
REGR
04H
Read input register
INRR
05H
Write single coil
COLW
06H
Write single register
REGW
10H
Write multiple
registers
MRGW
0FH
Write multiple coils
MCLW
tudonghoatoancau.com