4-42 120 Series Maternal/Fetal Monitor Revision B
2015590-001
Theory of Operation: Communications Board
Table 4-19. Model 2116B Keyboard Connector J2
Pin Number Signal Name
Signal type
(Relative to
Communications Board)
Signal Description
1 GND Output Ground
2 GND Output Ground
3 +5V Output +5 V
4 KBDBUSY* Output
Busy Signal Sent to Keyboard
when Monitor is Busy
5 KBDINVLD* Output
Sent to Keyboard when Monitor
Receives Invalid Message
6 KBDRST Output Resets Keyboard
7 KBDMARK* Input Mark Signal from Keyboard
8 KBDIN* Input
Keyboard Asserts this Line to
Indicate its Presence
9 KBD0 Input LSB of Keyboard Data
10 KBD1 Input Bit 1 of Keyboard Data
11 KBD2 Input Bit 2 of Keyboard Data
12 KBD3 Input Bit 3 of Keyboard Data
13 KBD4 Input Bit 4 of Keyboard Data
14 IBF Output Input Buffer Full from Monitor
15 STB* Input
Strobe from Keyboard—
Data Latched on Rising Edge
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