Protocol Switching - ICP DAS USA DGW-521 User Manual

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1.11 Protocol Switching

To switch to the DCON protocol:
1. Set the Modbus register 00257 to zero.
2. After a power-on reset, the communication protocol will be
changed to DCON.
To switch to the Modbus RTU protocol:
1. Sends the $AAPN command and set N to a value of 1.
Note that for the DGW-521, the INIT switch of the module
should be set to the INIT position, see the figure shown
below.
2. After a power-on reset, the communication protocol will be
changed to the Modbus RTU protocol.
20 DGW-521 User Manual, Rev. A1.0