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PC 2120 All-in-One 12.1” TFT LCD Panel PC User’s Manual
3.4
Three Serial Ports
The PC 2120 series provides three onboard serial ports installed on
the bottom rear side of the chassis. Arrangements on PC 2120 series
specify COM1, COM4 providing RS-232 interface, and with its
RS-422/485 interface connected to COM2. Each serial port comes
with +5V/+12V power capabilities on both Pin 1 and Pin 9, ready to
accommodate a wide array of serial devices such as fax modem,
scanner, serial mouse, touch screen...etc. If the touch screen option is
included, its controller will share COM3.
Pin #
1
2
3
4
5
6
7
8
9
Signal Name
R2-422 RS-485
1 TX- DATA-
2 TX+ DATA+
3 RX+ No connector
4 RX- No connector
5 GND GND
6 No connector No connector
7 No connector No connector
8 No connector No connector
9 No connector No connector
3.5 Parallel
Port
The printer interface is a 25-pin D-SUB connector located at the
bottom side. To connect any parallel device, just plug in the device
connector to the 25-pin D-SUB.
18 Hardware Installation