Chapter 3 PLC System Configuration & Settings 3.1.4.7 Options - COM1 Port Setting & COM2 Port Setting PLC modules are equipped with one or two COM ports based on different models. COM1 and COM2 parameters are set by clicking COM1 Port Setting and COM2 Port Setting in the list on the left-side of the following window. And the specific setting items are same for the two COM ports. Users can set a station address. A device on a network can be identified by means of the station address of the device. The station address of a device on a network can not be the same as the station address of another device on the same network.
Users can set the timing of getting effective for the communication port. The communication port will take effect when the CPU module changes from STOP to RUN if users select Stop --> Run. The communication port will take effect when the CPU module is powered on if users select Power on. Users set the baud rate for the COM port. Users can select one of the preset baud rates on the drop-down menu or select custom to type a custom baud rate. Users set the communication protocol for the COM port. Users set a value for Delay time to Reply .
The AS CPU module waits for a period of time set and then gives a reply after receiving a communication command so as to match the time when the remote device switches the mode. Users set a value for Received Data Timeout . The AS CPU module sends a communication command as a master. But it cannot receive a reply within a period of time set and that will be regarded as a timeout. Setting COM1 to show for: when COM1 is selected from the drop-down list, it will show the RS485 communication status of the COM1; when Card1 is selected from the drop-down list, it will show the Card1 communication status. 3-93