B Powered Serial Port Configuration - HP Point of Sale rp5000 Hardware Reference Manual

Powered Serial Port Configuration
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Hardware Reference Guide
The four serial ports on the HP Point of Sale System rp5000 can be
configured as either standard (non-powered) serial ports or powered
serial ports. Some Point of Sale devices use a powered serial port. If
the serial port is configured as a powered port, devices that support a
powered serial interface do not require an external power source.
The computer ships with the serial ports configured in standard mode.
Each serial port has two red jumpers. In powered serial port mode,
one jumper provides 5 volts to the Ring Indicate (RI) pin on the serial
connector. The other jumper provides 12 volts to the Data Carrier
Detect (DCD) serial connector pin. When configuring the port, both
jumpers must be moved to either the powered or standard
configuration position.
To configure the serial ports:
1. Turn off the computer properly through the operating system,
then turn off any external devices.
2. Disconnect the power cord from the power outlet and disconnect
any external devices.
3. Remove the computer access panel and front bezel (see Chapter
2, "Removing the Computer Access Panel and Front Bezel").
4. Raise the Easy Access drive bay to the upright position to access
the system board.
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