User Manual

2-25
Chapter 2: Motherboard information
NOTES:
N5105I-IM-A R2.0 supports six serial ports. COM1 supports RS-
232/422/485 and COM2~6 are RS-232. COM4~6 also supports
Ring/5V/12V according to jumper selection. You can select among RS-
232/422/485 mode, and select the RI voltage among Ring/5V/12V from
BIOS settings for COM1 port.
You can connect serial devices such as a mouse, a printer or a
communications network device to the COM ports. The IRQ and address
ranges for all the ports are xed. However, you can disable the port or
change the parameters via the system BIOS setup. Various devices
implement the RS-232/422/485 standards in different manners.
If problem with a serial device occurs, it is recommended that you check
the connector pin assignments.
The serial port cable is purchased separately.
24. COM Port headers (10-pin COM4~COM6)
These headers are for serial (COM) ports. Connect the serial port cables to
these headers, then install the module to a slot opening at the back of the
system chassis.
COM6
COM5
COM4
RXD
DTR#
DSR#
CTS#
DCD#
TXD
GND
RTS#
RING/5V/12V
A
B
C
PIN 1
PIN 2
PIN 9
PIN 10
A C
B
Connector type
BOX header 2x5p, K10, 2.00mm pitch