Inside the Type 146 Unit Cha
ter Three: Overview
66
General I/O Connector Pinout (Continued)
Pin Number Assignment
20 Reserved
21 Reserved
22 Analog 1 Common (Single Ground)
23 Relay A Normally Open
24 Relay A Common
25 Relay A Normally Closed
Table 21: General I/O Connector Pinout
Remote Zero Line Function with Ion Gauges
The Remote Zero lines on the General I/O connector act as an On/Off toggle switch for ion
gauges. A high to low transition on the Remote Zero line turns the ion gauge off. A low to high
transition turns the ion gauge on. This feature is supported for both hot cathode and cold cathode
gauges.
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