ICP DAS USA ET-2242, User Manual

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ET-2200 Series Ethernet I/O Modules
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Example: Function 04 (0x04), Read AIs

Reads the number of the DI channels on the ET-2260
[Leading 6 bytes] [Request]
Command: 01 02 00 00 00 06 01 04 00 64 00 01
[Leading 6 bytes] [Response]
Response: 01 02 00 00 00 05 01 04 02 00 02

A description of the command and response is as follows:
Command: [Leading 6 bytes]
Bytes 00-03 01 02 00 00 (Message Number)
Bytes 04-05 00 06 (Number of bytes remaining in this frame)
[Request]
Byte 00 01 (Net ID)
Byte 01 04 (Function Code)
Byte 02-03 00 64 (Starting AI Address)
Byte 04-05 00 01 (Number of 16-bit Registers)
Response: [Leading 6 bytes]
Bytes 00-03 01 02 00 00 (Message Number)
Bytes 04-05 00 05 (Number of bytes remaining in this frame)
[Response]
Byte 00 01 (Net ID)
Byte 01 04 (Function Code)
Byte 02 02 (Byte Count of the Response)
Byte 03-04 00 02 (Number of DI channels on the ET-2260)
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