6.5.6 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.