(4.3-inch industrial panel computer specific instructions: WLT_043 single-board computer has two serial ports and supports the highest baud rate of 115200bps. The device numbers corresponding to WinCE drivers are COM1 and COM2. Note: COM1RS-232 has two interface methods: the DB9 seat on the back side, as shown in "RS-232 COM1 serial port" in Figure 11; the side terminals, marked with "4" and "5" in Figure 12. You can only choose one of the two to use, don't connect it if you don't have to.)