Serial Port Interface; Serial Ports Irq Selection; Serial Ports Power Selection - AXIOMTEK SBC84820 Series User Manual

SBC84820 Pentium

3.10 Serial Port Interface

The SBC84820 Series has two onboard serial ports, COM1,
COM2 and, COM1 is RS-232/422/485, jumper selectable with
auto flow control features. All ports feature +5V/12V power
capability on DCD and RI, depending on the jumper setting.

3.10.1 Serial Ports IRQ Selection

IRQ for COM1 and COM2 are selected on IRQ4 or IRQ3. Both
ports can be enabled or disabled via BIOS setting.

3.10.2 Serial Ports Power Selection

The two COM ports have +5V power capability on DCD and
+12V power capability for RI, depending on the jumper setting.
The RS-232 pin assignments are listed on the following table.
COM1 Port Connector: CN15
The connector, COM 1, is a DB-9 connector, and the following
table shows the pin assignments of this connector.
Pin Signal Name
1 DCD, Data carrier detect
2
RXD, Receive data
3 TXD, Transmit data
4 DTR, Data terminal ready
5 GND, ground
6 DSR, Data set ready
7 RTS, Request to send
8 CTS, Clear to send
9
RI, Ring indicator
Hardware Description
®
M All-in-One Capa Board User's Manual
COM1
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