HP 5890 SERIES II Service Manual page 317

RS232C PCB CONNECTORS
J12.1 BD0
J12.2 BD1
J12.3 BD2
J12.4 BD3
J12.5 BD4
J12.6 BD5
J12.7 BD6
J12.8 BD7
J12.9 GND
J12.10 *EXT_IN2
J12.11 *EXT_OUT2
J12.12 *EXT_OUT0
J12.13 *EXT_OUT1
J12.14 *EXT_OUT8
J12.15 +5V
J12.16 +5V
J12.17 9.8304MHz
J12.18 GND
J12.19 GND
J12.20 GND
J12.21 GND
J12.22 GND
J12.23 D240 (240 Hz square wave)
J12.24 POP ( power- on- pulse)
J12.25 +15V
J12.26 - 15V
J12.27 +10VREF
J12.28 COMMON
J12.29 DAC2
J12.30 ATTN2
J13.1 GND
J13.2 RXD (RECEIVE DATA)
J13.3 TXD (TRANSMIT DATA)
J13.4 GND
J13.5 GND
J13.6 GND
J13.7 GND
J13.8 GND
J13.9 GND
J13.10 TXD (TRANSMIT DATA)
J13.11 RXD (RECEIVE DATA)
J13.12 GND
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