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Low Frequency Multiplexer Switch Modules 4
34980A User’s Guide 131
34925A D-Sub Connectors for Two- or Four-Wire Mode
Bank 1
Bank 2
For orientation, the D-sub connector
end of the module is facing you.
Bank 1
Bank 2
17L
34 35
36 37
38 39 40
41
42 43 44 45 46 47 48 49
50
18
19 20
21 22
23
24
25 26
27 28 29 30 31 32
33
GND 6H 6L 16H 16L 12H 12L 8H 8L 18H 18L 10H 10L
NC NC NC NC
Reserved 11H 11L 7H 7L 17H 13H 13L 9H 9L 19H 19L 15H 15L Interlock 1
12 3 4 5 6 7 891011121314151617
Interlock11H 1L 2H 2L 3H 3L
COM
1H
COM
1L
4H 4L 14H 14L 5H 5L 20H 20L
Description Pin Description Pin Description Pin Description Pin Description Pin
1H 1 6H 35 11H 19 16H 37 COM1 H 7
1L 2 6L 36 11L 20 16L 38 COM1 L 8
2H 3 7H 21 12H 39 17H 23 Interlock 1 17
2L 4 7L 22 12L 40 17L 24 Interlock 1 33
3H 5 8H 41 13H 25 18H 43 Reserved 18
3L 6 8L 42 13L 26 18L 44 GND 34
4H 9 9H 27 14H 11 19H 29 No Connect 47
4L 10 9L 28 14L 12 19L 30 No Connect 48
5H 13 10H 45 15H 31 20H 15 No Connect 49
5L 14 10L 46 15L 32 20L 16 No Connect 50
WARNING: As a safety
feature, interlock 1 pins
(17 and 33) on Bank 1
must be shorted to enable
the Bank 1 Analog Bus
relays to close. The
optional 34925T-001 (for
2-wire) terminal block
shorts these pins for you.
This feature protects
inadvertent routing of
high voltages from the
Analog Bus to the D-sub
connector of the module.
WARNING
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
GND 26H 26L 36H 36L 32H 32L 28H 28L 38H 38L 30H 30L
NC NC NC NC
37L
18 19
20
21
22
23 24 25 26 27 28 29 30 31 32 33
Reserved 31H 31L 27H 27L 37H 33H 33L 29H 29L 39H 39L 35H 35L Interlock 2
1 2 3 4 5 6 7 8 91011121314151617
23L Interlock 221H 21L 22H 22L 23H
COM
2H
COM
2L
24H 24L 34H 34L 25H 25L 40H 40L
Description Pin Description Pin Description Pin Description Pin Description Pin
21H 1 26H 35 31H 19 36H 37 COM2 H 7
21L 2 26L 36 31L 20 36L 38 COM2 L 8
22H 3 27H 21 32H 39 37H 23 Interlock 2 17
22L 4 27L 22 32L 40 37L 24 Interlock 2 33
23H 5 28H 41 33H 25 38H 43 Reserved 18
23L 6 28L 42 33L 26 38L 44 GND 34
24H 9 29H 27 34H 11 39H 29 No Connect 47
24L 10 29L 28 34L 12 39L 30 No Connect 48
25H 13 30H 45 35H 31 40H 15 No Connect 49
25L 14 30L 46 35L 32 40L 16 No Connect 50
WARNING:: As a safety
feature, interlock 2 pins
(17 and 33) on Bank 2
must be shorted to enable
the Bank 2 Analog Bus
relays to close. The
optional 34925T-001 (for
2-wire) terminal block
shorts these pins for you.
This feature protects
inadvertent routing of
high voltages from the
Analog Buses to the
D-sub connector of the
WARNING