For TOPRE0400WD / TOPRE0400WD NE / TOPRE0700WD / TOPRE0700WD NE (TOPRE Series) products, there is only one COM port physically visible. However, this port is separated into COM1/COM2 in the software.
Pins 2, 3, and 5 of the serial COM port are used for COM1 RS-232C communication,
while pins 1, 4, 6, and 9 of the same serial COM port are used for COM2 RS422/485 communication.
Previous models (XTOP04TW-UD / XTOP07TW-LD / XTOP07TW-LD-E / XTOP07TW-UD) provided two COM ports: COM1 communicated only with RS-232C, and COM2 supported RS-232C/422/485 communication.
If you previously set up RS-232C communication with the PLC on COM2 and transfer the same project file directly to a TOPRE Series device, communication will not work due to a change in the port configuration. This is because the COM2 port of the TOPRE Series does not support RS-232C communication.
In this case, proceed as follows:
Launch the [Project - Properties] menu in TOP Design Studio.
In [Project Options], move the PLC configured on COM2 to the COM1 port.
Select the PLC for COM2 with your mouse and drag & drop it to COM1.
Transfer the project file again.
After moving to the menu screen using the Exit button in the top menu of TOP, go to [Control Panel - Serial] and match the COM1 communication settings to the PLC settings.
Run the [Control Panel - PLC] menu and press the [Communication Diagnostics] button at the bottom to check if communication succeeds.