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software to communicate.
6. Timeout: frame timeout (ms), reply timeout (ms)
Frame: A data string.
Frame timeout: refers to the time interval between two frames of data received by the
PLC, which ensures that the PLC can distinguish the end time of receiving a frame. It
is usually used to judge whether a frame of data in PLC has been received or not.
When the interval between two frames of data is longer than the frame time-out, it
means the end of one frame of communication data.
Reply timeout: refers to the time when the PLC can not receive the response after
sending the request, waiting for the resend. If the response time is set to exceed 300
ms, when default communicating, the PLC waits 300ms for the other party to respond.
If the response time is not received, the request will be sent again.
If you want to shorten the communication time, you can adjust the above two
parameters according to the size of baud rate.
6-3-2 Serial port configuration
(1)Use the USB download cable to connect the PLC with the computer. Here the USB
download cable is the HMI download cable, as shown below, the software must switch to
XNet communication mode.
(2)Open the programming software, click configure/PLC comm port settings. It will show
below figure:
(3)Click add, it will show two modes, modbus mode and free mode, please select free mode, it
will show below figure.
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