CX3G/FX3GC PLC Programming manual
www.coolmayplc.com
Demo program：
Use the serial port tool by serial port 2 to monitor the data obtained is
[2017:11:01:10:49:16][receive]31 32 33
3, When used as MOdbus RTU： set M8196=1,M8125=1; set D8120 as
communication parameters, D8121 set as slave station. For example:
D8120=HE081,D8121=H1（communications parameter as 9600/8/n/1,station number
is 1）
When PLC is as host, ADPRW,RD3A and WR3A is supported.
RD3A and WR3A only support the below MODBUS functions:
Function No. 03: Reads the holding register and takes the current binary value range
of 1-32 in one or more holding registers.
Function No. 06: Load the specific binary value into a holding register (write register)
with a range of one.
Function No. 16: Preset multiple registers, load specific binary values into a series of
consecutive holding registers (write multiple registers). The range is 1-32.
For 26231 below version The RD3A and WR3A must be triggered with a rising edge.
For 26231 and above,it can be triggered by the normal signal.
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