DFI CP337-NRM - Manual (Page 30)

30
2
Hardware Installation
1
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 JP4’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
COM 4
1 9
2
DCD- TD
RD
D
TR
-
GND R
T
S-
DSR
-
CT
S-
RI
-