Agilent Technologies 7820A

190
Agilent 7820 GC Service
Power connection table
Black wires, that are not part of twisted pairs, are GROUND for
pin 2 of the associated EPC.
Red wires, that are not part of twisted pairs, supply + 24 VDC to
pin 1 of the associated EPC module.
Power connector
pin
Wire
color
Signal
EPC (pin)
1
Red
+ 24 VDC
EPC 1 (1)
8
Black
GROUND
EPC 1 (2)
2
Red
+ 24 VDC
EPC 2 (1)
9
Black
GROUND
EPC 2 (2)
3
Red
+ 24 VDC
EPC 3 (1)
10
Black
GROUND
EPC 3 (2)
4
Red
+ 24 VDC
EPC 4 (1)
11
Black
GROUND
EPC 4 21)
6
Red
+ 24 VDC
B DET (1)
13
Black
GROUND
B DET (2)
7
Red
+ 24 VDC
F DET (1)
14
Black
GROUND
F DET (2)
5
Red
12
Black
Data communication table
Data are transmitted to and from the EPC modules on twisted
pairs of wires.
Comm Bus connector
pin
Wire color
Twisted
pair?
EPC (pin)
1
White
Yes
EPC 1 (3)
2
Black
EPC 1 (4)
3
White
Yes
EPC 2 (3)
4
Brown
EPC 2 (4)
5
White
Yes
EPC 3 (3)
6
Red
EPC 3 (4)
7
White
Yes
EPC 4 (3)
8
Orange
EPC 4 (4)
17
White
Yes
B DET (3)
18
Grey
B DET (4)
19
White
F DET (3)