To set the communication "Baud Rate" of the PLC’s serial channel #ch. All the M series PLC serial ports are defined as 8 data bit, 1 stop bit, and no parity and each has been preset to a certain default baud rate, which the PLC will assume every time its powers up. The baud rate may or may not be changed, depends on the PLC model. Please refer to the PLC’s User’s manual for the baud_no that represent the baud rate of each serial channel and the range of baud_no each of these serial ports may assume.

Caution should be taken when programming the baud rate of the "Host link" port because if a wrong baud value is set the host PC may not be able to communicate with it. If this happens suspend the PLC using its hardware switch (such as DIP switch #4 on T100MD1616+) , reset the PLC and re-load the program with correct setting.