Panasonic FP0R User Manual page 112

7.5.6 Changing Communication Mode Using F159(MTRN) Instruction
An F159 (MTRN) instruction can be executed to change between general-purpose serial communication
mode and computer link mode. To do so, specify H8000 for n (the number of transmission bytes) and
execute the instruction.
Changing from "general-purpose" to "computer link"
Changing from "computer link" to "general-purpose"
R9032: The COM port mode flag turns on when general-purpose serial communication mode is selected.
Note:
When the power is turned on, the operating mode selected in system register 412 takes effect.
It is not possible to change to the MODBUS RTU mode.
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