33
Hardware Installation
COM (Serial) Ports
COM 1
COM 2
COM 3
COM 1 and COM 2
DCD-
TD
RD
D
TR
-
GND
1
2
3
4 5
R
T
S-
RI
-
DSR
-
CT
S-
6
7 8 9
COM 1, COM 2 and COM 4 are fixed at RS232.
COM 3’s pin definition will vary according to JP11’s settings. Refer to “COM 3
RS232/RS422/RS485 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.
COM 4
1
9
2
DCD-
TD
RD
D
TR
-
GND
R
T
S-
DSR
-
CT
S-
RI
-
COM 4
