Serial Ports
All serial (COM) ports can be custom configured in either standard mode or powered mode. By repositioning
the jumpers (provided) on the system board and on the COM port PCI add-in card (some models), each COM
power can achieve power on pin 1 or pin 9. The illustration and table below indicate the COM port
assignments and voltage supported for each COM port.
COM port assignment
Description
Standard Mode
+5V +9V
+12V
1
COM1 (yellow)
Yes Yes Yes Yes
2
COM2
Yes Yes
No
Yes
3
COM3 (some models)
Yes Yes
No
Yes
4
COM4 (some models)
Yes Yes
No
Yes
The following illustrations show how to position the jumpers on the system board and on the COM port PCI
add-in card (available on some models) to achieve power on pin 1 or pin 9.
P16 and P127 are located on the system board behind the COM1 port.
QuickSpecs
HP rp5700 Point of Sale (POS) System or HP rp5700
Business Desktop PC
Technical Specifications - Communications
DA - 12703 North America — Version 32 — June 21, 2013
Page 17
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