Xinje XL Series - 6-3-5 Free communication example

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RCVST K2
n
M0

Release serial port instructions, M0's rising edge execute once.

Communication port. Scope: K0 ~ K5. K0: Port0 (RS232), K1: Port1(RS232), K2:
Port2(RS485), K3: Port3(left extension port), K4: Port4(above extension port 1), K5:
Port5(above extension port 2).

When releasing the serial port, the "received" flag SM163(communication port 2) is
set OFF.

For free communication, if there is no timeout or the timeout time is set too long, the
occupied serial port resources can be released immediately through RCVST
instructions for other communication operations.
6-3-5 Free communication example
Example 1: In chapter 6-3-3, we give an example of communication between Xinje PLC and
temperature control instrument when explaining why to use free communication. Here is an
example.
Operation steps:
1. Connect the hardware first. Here we use the serial port 2 of the PLC to communicate, that
is, 485 + on the instrument is connected to A of the output port of the PLC, and 485- on the
instrument is connected to B of the output port of the PLC.
2. Set the serial port parameters of PLC according to the communication parameters of
temperature control instrument. The parameters are set as follows. After setting the
parameters, the power can be restarted.
Function and action
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