User Manual

MiniStation All-in-One Petit Board User’s Manual

Hardware Description

The address selection of the onboard parallel port, in LPT1 (378H), LPT2 (278H), or disabled, is configured

within the BIOS CMOS setup utility.

4.11 Serial Port Interface

The MiniStation has four onboard serial ports, COM1, COM2 and COM3 are RS-232 and COM4 is RS-

232/422/485, jumper selectable. All four ports feature +5V/12V power capability on DCD and RI, depending

on the jumper setting.

4.11.1 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. The IRQ for COM3 and COM4 is selected on 10 or 11 by BIOS setting.

4.11.2 Serial Ports +5V and +12V Power Selection

The four COM ports have +5V/+12V power capability on DCD and RI, depending on the jumper setting.

(See Section 2.3.3). The RS-232 pin assignments are listed on the following table.

Pin Description

1 Data Carrier Detect (DCD)

2 Receive Data (RXD)

3 Transmit Data (TXD)

4 Data Terminal Ready (DTR)

5 Ground (GND)

6 Data Set Ready (DSR)

7 Request to Send (RTS)

8 Clear to Send (CTS)

9 Ring Indicator (RI)