Sun Microsystems 220R service manual Reference for the Serial Port a and B Connectors

A.1.2 Keyboard/Mouse Connector Signals

Pin	Signal Name	Signal Description
1	Gnd	Ground
2	Gnd	Ground
3	+5 VDC	+5 VDC
4	Mse-rxd	Mouse receive data
5	Kbd-txd	Keyboard out
6	Kbd-rxd	Keyboard in
7	Kbd-pwk	Keyboard power on
8	+5 VDC	+5 VDC

A.2 Reference for the Serial Port A and B Connectors

The serial port A and B connectors (J2902 and J2903, respectively) are DB-25 type connectors located on the main logic board back panel. Both serial ports conform to RS-423/RS-232 specifications.

232 Sun Enterprise 220R Server Service Manual ♦ January 2000, Revision A