Technical Reference Guide
Compaq Deskpro EP Series of Personal Computers
First Edition - April 1998
5-15
5.4 SERIAL INTERFACE
The serial interface transmits and receives asynchronous serial data with external devices. The
serial interface function is provided by the 87309 I/O controller component, which integrates a
16550/16450-compatible UART. The UART is paired with a DB-9 connector and complies with
the RS-232 standard.
5.4.1 RS-232 INTERFACE
The DB-9 connector-based interface complies with EIA standard RS-232-C, which includes
modem control signals and supports baud rates up to 115.2 Kbps. The DB-9 connector is shown
in the following figure and the pinout of the connector is listed in Table 5-9.
Figure 5–3.
Serial Interface Connector (Male DB-9 as viewed from rear of chassis)
Table 5–9.
DB-9 Serial Connector Pinout
Table 5-9.
DB-9 Serial Connector Pinout
Pin Signal Description Pin Signal Description
1 CD Carrier Detect 6 DSR Data Set Ready
2 RX Data Receive Data 7 RTS Request To Send
3 TX Data Transmit Data 8 CTS Clear To Send
4 DTR Data Terminal Ready 9 RI Ring Indicator
5 GND Ground -- -- --
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