CX3G/FX3GC PLC Programming manual
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M8402：Send mark (use when RS2 command).
M8403：Communication completion mark (communication completion flag when using
RS command, needs manual reset).
M8404: Data is receiving.
M8408：Communication completion mak (Valid while using ADPRW command and
needs manual reset).
M8409: Communication time out.
M8029: Communication completion mark (communication completion mark while
using ADPRW instruction and needs manual reset).
M8161: 8-bit/16-bit mode distinguishing mark for RS/RS2 command (version 26230
and above, always in 8-bit mode)
D8400: Save the communication parameters of the Modbus RTU protocol
D8401: Save the communication mode of serial port 3. D8401=H11 represents PLC
as Slave. D8401=H1 represents PLC as Master; D8401=H0 represents the RS free
communication mode.
D8406: Interval period. Default as 12 times.
D8409: Time-out period. (Unit: ms. Better not over 100ms while setting.)
D8414: Save the master or slave station number (The value mast be set as max K255
as master).
D8126: When using the serial port 3 in the ADPRW instruction, set D8126 to 1.
(26232 or lower version)
D8397: When using the serial port 3 in the ADPRW instruction, set D8397 to 1.
(26232 and higher version)
Support RS2,WR3A,RD3A,ADPRW commands. Can be set in parameter zone,
correspond to serial port 3. Parameter zone settings are valid only for this channel.
Invalid for serial port 2.
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