Varian 948, Operation And Service Manual

Page: 43 / 176

Models 947, 948 and 960 Leak Detectors Operations and Service Manual
2-7
2.3.2 BCD J121 Outputs
Table 2-3 provides the J121 output connections.
23 Ready Active High Active when system is operating
(inverse of “Not Ready”).
25 Ground return for J120 only
27, 28 +24 VDC for Output Sourcing
Table 2-3 J121 Output Summary
Pin on
J121
Signal Name Momentary
or Level
Description
1, 2 Ground for J121
3 LSD A Active High BCD Leak Rate
4 LSD B Active High BCD Leak Rate
5 LSD C Active High BCD Leak Rate
6 LSD D Active High BCD Leak Rate
7 MSD A Active High BCD Leak Rate
8 MSD B Active High BCD Leak Rate
9 MSD C Active High BCD Leak Rate
10 MSD D Active High BCD Leak Rate
11 LSD A Active High BCD Leak Rate
12 LSD B Active High BCD Leak Rate
13 LSD C Active High BCD Leak Rate
14 LSD D Active High BCD Leak Rate
15 MSD A Active High BCD Leak Rate
16 MSD B Active High BCD Leak Rate
17 MSD C Active High BCD Leak Rate
18 MSD D Active High BCD Leak Rate
20, 21 +24 VDC for Output Sourcing
24, 25 Ground for J121
Table 2-2 J120 Input Connections (Continued)
Pin on
J120
Input Name Momentary or Level
Description