ICP DAS USA M-7065 User Manual page 104

Response:
00 Address
01 Function code
02 Byte Count
03~ Register values
Error Response:
00 Address
01 Function code
02 Exception code
Examples:
Command:05 03 01 E2 00 02 [ 64 45 ]
Response:05 03 04 70 65 00 00 B5 2C
Reads module's name
[Command]
Byte 2~3 : 01 E2 (Address mapping)
Byte 4~5 : 00 02 (Word count)
[Response]
Byte 2 : 04 (Byte count of response)
Byte 3~6 : 70 65 00 00, 70 65(Low word of
module name), 00 00(High word of module
name)
M-7065 User's Manual Ver2.0, Dec. /200 8 ---104
1 Byte
1 Byte
Byte count of response
1 Byte
(B=2 * word count)
(B*2) Byte
1 Byte
1 Byte
Refer to Modbus standard
1 Byte
1-247
0x03
Register values
1-247
0x83
for more details