Chapter Three: Hardware Overview
Rear Panel
37
Pinout of the I/O Connector Pinout
Pin Number
Assignment
Pin Number
Assignment
1
Trip Point A NC
20
Trip Point A Common
2
Trip Point A NO
21
Trip Point B Common
3
Trip Point B NC
22
Trip Point B NO
4
Digital Ground
23
x1 Range ID
5
x0.1 Select
24
x0.01 Select
6
Special
25
1
7
10
26
100
8
1K
27
10K
9
Latch TP B
28
Select Channel 2 *
10
Latch TP A
29
Select Channel 1 *
11
Reserved
30
+15 V
12
Remote Zero
31
-15 V
13
Reserved
32
Power Ground
14
Channel 3 ID
33
Reserved
15
Channel 2 ID
34
Reserved
16
Channel 1 ID
35
Analog Ground
17
Reserved
36
Pressure Output
18
x0.01 Range ID
37
Reserved
19
x0.1 Range ID
NC = Normally Closed NO = Normally Open
* The 274 multiplexer uses these pins select the active channel. Both pins 28 and 29 high when
Channel 3 is the active channel.
Table 9: Pinout of the I/O Connector
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