0X03) Reading Multiple Registers - ICP DAS USA ZT-2017 User Manual

6.3.5

03 (0x03) Reading Multiple 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 0x03
2 See Section 6.3.1 for details
2 0x0001 to 0x0020
Length Value
1 1 to 247
1 0x03
1 Byte Count of Response (B=2 * Word Count)
B*2 Register Values
Length Value
1 1 to 247
1 0x83
Refer to the Modbus standard for more
1
details
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