Serial Interface - HP Compaq Elite 8000 CMT Technical Reference Manual

Input/Output Interfaces

5.3 Serial Interface

Systems covered in this guide may include one RS-232-C type serial interface to transmit and
receive asynchronous serial data with external devices. Some systems may allow the installation
of a second serial interface through an optional bracket/cable assembly that attaches to header
P52 on the system board. The serial interface function is provided by the super I/O controller
component that includes two NS16C550-compatible UARTs.
The UART supports the standard baud rates up through 115200, and also special high speed rates
of 239400 and 460800 baud. The baud rate of the UART is typically set to match the capability
of the connected device. While most baud rates may be set at runtime, baud rates 230400 and
460800 must be set during the configuration phase.
The serial interface uses a DB-9 connector as shown in the following figure with the pinout listed
in Table 5-4.
Figure 5-3. DB-9 Serial Interface Connector (male, as viewed from rear of chassis)
Pin Signal
1 CD
2 RX Data
3 TX Data
4 DTR
5 GND
The standard RS-232-C limitation of 50 feet (or less) of cable between the DTE (computer) and
DCE (modem) should be followed to minimize transmission errors. Higher baud rates may
require shorter cables.
5-4
Table 5-2.
DB-9 Serial Connector Pinout
Description
Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Ground
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Pin Signal Description
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicator
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