Internal I/O Connectors; Com (Serial) Ports - DFI PIC-Q170/H110 User Manual

PIC-Q170/H110

► Internal I/O Connectors

COM (Serial) Ports

COM 4 (left) COM 2 (left)
COM 3 (right) COM 1 (right)
(RS232 only) (RS232/RS422/RS485)
1 2 1 2 1 2
9 9 9
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 1 and COM 2 support three serial modes, i.e. RS232, RS422, and RS485. COM 3 & COM
4 support only RS232. Serial mode is configured in BIOS.
BIOS Setting
Configure the serial ports in the Advanced menu ("Super IO Configuration" submenu) of the
BIOS. Refer to chapter 3 for more information.
Chapter 2 - Hardware Installation
1 2
9
▼ COM Port Pin Assignment
Pin RS232
1 DCD-
2 RD
3
TD
4 DTR-
5 GND
6
DSR-
7 RTS-
8
CTS-
9
RI-
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.
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RS422 Full Duplex RS485
TXD- Data-
TXD+ Data+
RXD+ N.C.
RXD- N.C.
GND GND
N.C. N.C.
N.C. N.C.
N.C. N.C.
N.C. N.C.