Datakom DKM-409 PRO AT, Руководство пользователя

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DKM-409 Pro AT User Manual Rev_02 Firmware V-2.5
K91D01-EN - 53 -
BYTE DESCRIPTION VALUE
0 Controller
Address 1-253
1 Function Code 3
2 Starting Address
(Upper) See below for detailed explanation
3 Starting Address
(Lower) See below for detailed explanation
4 Register Number
(Upper) 0
5 Register Number
(Lower) Max 7Bh (123 decimal)
6 CRC Lower Byte CRC calculation is mentioned below
7 CRC Upper Byte CRC calculation is mentioned below
Sample message, which reads 16 registers from 20h (32 decimal) address, is explained below.
01 03 00 20 00 10 45 CC (each byte is written as 2 hexadecimal characters)
Expected return message is:
BYTE DESCRIPTION VALUE
0 Controller
Address Same as query
1 Function Code 3
2 Data Length
Bytes Register number x 2
3 1.Register Upper
Byte
4 1.Register Lower
Byte
5 2.Register Upper
Byte
6 2.Register Lower
Byte
… … …
L+1 Last Register
Upper Byte
L+2 Last Register
Lower Byte
L+3 CRC Lower Byte CRC calculation is mentioned below
L+4 CRC Upper Byte CRC calculation is mentioned below
Failure response message is:
BYTE DESCRIPTION VALUE
0 Controller
Address Same as query
1 Function Code 131 (Function code+128)
2 Fail Code 2 (invalid address)
3 CRC Lower Byte CRC calculation is mentioned below
4 CRC Upper Byte CRC calculation is mentioned below