ICP DAS USA M-7065 User Manual page 59

Data acquisiton and control modules
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0: DCON
1: Modbus RTU
3: Modbus ASCII
There will be no response if the command syntax is
incorrect, there is a communication error, or there is
no module with the specified address.
Examples:
Command:$01P
Response:!0130
Reads the communication protocol of module
01 and returns a response of 30 meaning that it
supports the DCON and Modbus RTU/ASCII
protocols and the protocol that will be used at
the next power-on reset is DCON.
Related Commands:
Section
2.18 $AAPN
M-7065 User's Manual Ver2.0, Dec. /200 8 ---59

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