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VOTER DIAGNOSTICS MODULE (VDM)
15-2
15.2.2 JUMPER PLACEMENT
15.2.3 VDM BACKPLANE EXTERNAL
CONTACTS
See the Backplane Section 23 for pinouts on the
shelf backplane and wire harness pinouts.
15.3 VDM ALIGNMENT SPECIFICATIONS
No alignment is required for the VDM. The
setup procedures are to make the proper switch
settings and connections.
Figure 15-2 VDM I/O CONNECTIONS
Table 15-1 VDM SWITCH SETTINGS
Switch Open Sections Close Sections
Digital Communication Using Secondary
Lines.
S1
S3
S4
S5
1
1
-
-
2
2
-
-
-
-
3
-
4
-
4
-
-
-
1
1
-
-
2
2
3
3
-
3
-
4
-
4
Table 15-2 VDM BOARD JUMPER
PLACEMENT
JU Pin Description
J24 1 to 2
2 to 3*
Selects 27512 EPROM operation
Selects 27256 EPROM operation
J27 1 to 2
2 to 3*
Not Used
Normal Operation
P33 1 to 2*
3 to 4*
5
6
No personality card attached
No personality card attached
open
open
J36 1 only*
1 to 2
2 to 3
Not used
-48V E-lead operation
-15V E-lead operation
J14
J15
J21
J22
Jumper pin 1 to 2 for high impedance ground path
for split 600 ohm inputs and outputs. Leave open if
no ground path desired.
*Setting for Normal operation.
Table 15-3 BACKPLANE PINOUTS
Backplane
P34 to P45
Description
Wire Harness
J1,3,5,7
pin 27
pin 28
pin 29
pin 30
pin 31
pin 32
Sec Rx +
Sec Rx -
EA lead
EB lead
Pri Rx Audio+
Pri Rx Audio-
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6
Signal
Ground
J2,4,6,8
pin 59
pin 60
pin 61
pin 62
pin 63
pin 64
Sec Tx +
Sec Tx -
MA lead
MB lead
Pri Tx Audio+
Pri Tx Audio-
Signal
Ground
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6