ICP DAS USA ET-2242 User Manual page 77

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ET-2200 Series Ethernet I/O Modules
Example: Function 01 (0x01), Readback Dos

Reads the Digital Output value
[Leading 6 bytes]
Command: 01 02 00 00 00 06
[Leading 6 bytes]
Response: 01 02 00 00 00 04

A description of the command and response is as follows:
Command:
Response:
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[Leading 6 bytes]
Bytes 00-03 01 02 00 00
Bytes 04-05 00 06
[Request]
Byte 00 01 (Net ID)
Byte 01 01 (Function Code)
Byte 02-03 00 00
Byte 04-05 00 02
[Leading 6 bytes]
Bytes 00-03 01 02 00 00
Bytes 04-05 00 04
[Response]
Byte 00 01 (Net ID)
Byte 01 01 (Function Code)
Byte 02 01 (Byte Count of the Response)
Byte 03 03 (Value for DO0 to DO1)
[Request]
01 01 00 00 00 02
[Response]
01 01 01 03
(Message Number)
(Number of bytes remaining in this frame)
(Starting DO Address)
(Number of Points)
(Message Number)
(Number of bytes remaining in this frame)
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