Free port communication baud rate can be set to 1200, 2400, 4800, 9600, 19200,
38400, 57600 or 115200.Devices that meet the above conditions can communicate
with PLC.Free port mode has great flexibility.
Free port instructions:
UFP_RCV
UFP_RCV :Receive data instruction
PORT: Communication port.
TBL: Configuration table ， If the input is MB200.
MB200 is the configuration byte:
（ Instruction output ） M200.0 Communication
preparation
（ Instruction output ） M200.1 Communication
completion
（ Instruction output ） M200.2 Communication error
（ Instruction input ） M200.3 Send CRC check
（ Instruction input ） M200.4 Send CRC check
（ Instruction input ） M200.5 Receive CRC check
（ Instruction input ） M200.6 Receive CRC check
（ Instruction output ） MB201 Error number ： 0indicates
no error.
RCV: receive data,If the input is MB400:
（ Instruction input ） MW400: Receive data FIFO buffer
size (byte unit)
（ Instruction output ） MW402:The size of the received
data (in bytes)
（ Instruction output ） MB404 ~ … receive data.
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