Function 01(0X01)-Read Coils - ICP DAS USA ZT-2005-C8 User Manual

5.3.2

Function 01(0x01)-Read Coils

Desctiption
This function code is used to read the value at addresses 0xxxx.
Syntax
Byte
00 Module address
01 Function Code
02~03 Reference Address
04~05 Bit Count
06~07 Checksum (CRC16)
Response
Byte
00 Module address
01 Function Code
02 Byte Count
03~(N+2) Bit Value
(N+3)~(N+4) Checksum (CRC16)
Error Response
Byte
00 Module address
01 Function Code
02 Exception Code
03~04 Checksum (CRC16)
Examples
Command 1A 01 01 0A 00 01 [DF DF]
Response 1A 01 01 00 [57 6C]
Reads the temperature scale of module address 26, and response 0: Celsius(℃).
Response 1A 01 01 01 [96 AC]
Reads the temperature scale of module address 26, and response 1:
Fahrenheit(℉).
ICP DAS, ZT-2005-C8 User Manual, Version v1.0.1
Copyright © 2014 by ICP DAS Co., Ltd. All Rights Reserved.
Description
Description
Description
Value
1~247
0x01
Refer to section 5.3.1, Address 0xxxx
Number of bit(B) to read
Two bytes checksum
Value
1~247
0x01
Response data byte N=B/7
Response bit data
Two bytes checksum
Value
1~247
0x81
Refrt to section 5.3
Two bytes checksum
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