4-32 120 Series Maternal/Fetal Monitor Revision B
2015590-001
Theory of Operation: DSP Board
Table 4-15. Front Panel Interface Connector J4
Pin Number Signal Name Signal Description
1 HR1VOLUP/ HR1 Volume Up Switch Input
2 No Connection —
3 HR1VOLDN/ HR1 Volume Down Switch Input
4 TSW/ Trim Knob Push Button Switch Input
5 HR2VOLUP/ HR2 Volume Up Switch Input
6 RECLED1/ Recorder LED Drive Output
7 HR2VOLDN/ HR2 Volume Down Switch Input
8 RECLED2/ Recorder LED Drive Output
9 TEST/ Test Switch Input
10 GND Power Ground
11 UA REF/ UA Reference Switch Input
12 GND Power Ground
13 MARK/ Recorder Mark Input Signal
14 A/ Trim Knob Quadrature Switch Input Line
15 PADV/ Paper Advance Switch Input
16 B/ Trim Knob Quadrature Switch Input Line
17 RECON/ Recorder On Switch Input
18 ALRM CAN/ Alarm Cancel Switch Input
19 BP STRT* NBP Start Switch Input
20 spare Spare Input
21 BP STOP/ NBP Stop Switch Input (unused)
22 +5V +5 Volt Power
23 GND Power Ground
24 +5V +5 Volt Power
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