0X04) Reading Multiple Input Registers - ICP DAS USA ZT-2017 User Manual

6.3.6

04 (0x04) Reading Multiple Input Registers

Description
This function code is used to read the current digital input counter values
from the ZT-2000 I/O module.
Request
Byte Description
00 Address
01 Function Code
Starting Channel
02~03 Number or
Address Mapping
Output Channel
04~05 Number or Bit
Count
Response
Byte Description
00 Address
01 Function Code
02 Byte Count
03~ Register Values
Error Response
Byte Description
00 Address
01 Function Code
02 Exception Code
ICP DAS, ZT-2017 and ZT-2017C AI Series User Manual, Version 1.0.1
Copyright © 2012 by ICP DAS Co., Ltd. All Rights Reserved.
Length Value
1 1 to 247
1 0x04
2 See Section 6.3.1 for details
2 0x0001 to 0x0020
Length Value
1 1 to 247
1 0x04
Byte Count of the Response
1
(B=2 * Word Count)
B*2 Register Values
Length Value
1 1 to 247
1 0x84
Refer to the Modbus standard for more
1
details
Page 112