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Chapter 2 Hardware Installation
Chapter 2
COM (Serial) Ports
COM 2/COM 3/COM 4:
RS232
COM 1:
RS232/422/485
2
1
9
DCD- TXD
RXD DT
R-
GND RT
S-
DSR
-
CTS-
RI
-
2
1
9
COM 2 to COM 4 are fixed at RS232.
The pin functions of COM port 1 will vary according to JP3’s, JP4’s and JP5’s setting. They are
used to configure the Serial COM port 1 to pure RS232, RS422 Full Duplex or RS485. Refer to
“COM 1 RS232/422/485 Select” in this chapter for more information.
The serial ports are asynchronous communication ports with 16C550A-compatible UARTs that
can be used with modems, serial printers, remote display terminals, and other serial devices.
Connecting External Serial Ports
Your COM port may come mounted on a card-edge bracket. Install the card-edge bracket to
an available slot at the rear of the system chassis then insert the serial port cable to the COM
connector. Make sure the colored stripe on the ribbon cable is aligned with pin 1 of the COM
connector.
Important:
When
COM 1 RS232/422/485 is selected, JP4 and JP5 must be set in accordance to
JP3.
COM 2
COM 3
COM 4
