DFI Q7A-551 - Manual (Page 14)

www.dfi .com Chapter 2 Hardware Installation
14
Chapter 2
Serial (COM) Ports
COM
COM:
RS232 or UART5
USB Client Port
USB Client
COM 2:
RS232/422/485
DCD- TD RD DT
R-
GND
1 2 3 4 5
RT
S- RI
-
DSR
-
CTS-
6 7 8 9
The system board is equipped with two onboard serial COM ports (COM and COM 2). It is also
equipped with a 9-pin connector for connecting an external serial COM port (COM 1). COM is
fixed at RS232 or UART5 via JP11’s and JP12’s setting at the same time. COM port 1 and COM
port 2 will vary according to JP4’s (for COM 1) and JP6’s (for COM 2) setting respectively.
The serial COM port is RS232 asynchronous communication port with 16C550A-compatible
UARTs that can be used with modems, serial printers, remote display terminals, and other se-
rial devices. To connect COM 1, please refer to the following description. The serial port may
be 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 cable connector to the 9-pin connector. Make sure
the colored stripe on the ribbon cable is aligned with pin 1 of the connector.
1 2
9
COM 1:
RS232/422/485
Important:
You need to set JP11 and JP12 simultaneously.
The shape of the mini USB port is smaller than the standard one and is a device operating as
a client port.