Function 02(0X02)-Read Discrete Inputs - ICP DAS USA ZT-2005-C8 User Manual

5.3.3

Function 02(0x02)-Read Discrete Inputs

Desctiption
This function code is used to read the value at addresses 1xxxx.
Syntax
Byte
00
01
02~03
04~05
06~07
Response
Byte
00
01
02
03~(N+2)
(N+3)~(N+4) Checksum (CRC16)
Error Response
Byte
00
01
02
03~04
Examples
Command
Response
Reads the temperature scale of module address 26, and response 0: Celsius(℃).
Response
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
Module address
Function Code
Reference Address
Bit Count
Checksum (CRC16)
Description
Module address
Function Code
Byte Count
Bit Value
Description
Module address
Function Code
Exception Code
Checksum (CRC16)
1A 02 01 0A 00 01 [9B DF]
1A 02 01 00 [A7 6C]
1A 02 01 01 [66 AC]
Value
1~247
0x02
Refer to section 5.3.1, Address 1xxxx
Number of bit(B) to read
Two bytes checksum
Value
1~247
0x02
Response data byte N=B/7
Response bit data
Two bytes checksum
Value
1~247
0x82
Refrt to section 5.3
Two bytes checksum
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