HP Rp3000 Service Reference Guide: HP rp3000 Point of Sale - Page 61
Removing the Powered Serial Port Caps, Configuring Power to a Serial Port - point of sale
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Removing the Powered Serial Port Caps If the powered serial ports have been configured for power from the factory, they will be covered by protective plastic caps. Turn off the computer and remove the caps before connecting powered serial Point of Sale devices. Figure 6-26 Removing the Powered Serial Port Caps Configuring Power to a Serial Port The serial ports on the HP Point of Sale System computer can be configured as 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. NOTE: The computer ships with all serial ports configured in standard serial mode by default unless the powered serial port AV numbers are ordered. The serial port jumpers on the system board are located as shown in the following illustration: Powered Serial Ports - Removal and Installation 53
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