Read Input Register - Ebyte MA02-AAC 2240 Series User Manual

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address code
After sending the above command to the device via RS232, the device will return the following values:
20
Device ModBus Function
address code
The coils of DO2 and DO3 are turned on.

7.3.7 Read input register

Take the example of collecting the original values of 4 AI channels, use the 04 function code to read the original values
of the 4 AI channels.
20 04
Device Modbus Function
address code
After sending the above command to the device via RS232, the device will return the following values:
20 04
Device Modbus Function
address code
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address
0F 00 00
Register address
00 00
Initial
address
08
Number of
represents an AI channel data, where
data bytes
the original value of each channel is
【2DI + 2AI + 4DO】 MA02-AACX2240 User Manual
bytes of data
Number of coils
00 04
The number of AI channels is 4
00 00 00 00 00 00 00 00
Raw value data of 4 AI
channels,Every 2 bytes of data
0,0,0,0 respectively
data
(bit operation)
OO O4
CRC check
XX XX
CRC check code
XX XX
CRC check code
code
XX XX
code
40