Appendix C: BCD Option
General Information
41
Appendix C: BCD Option
General Information
This option provides a latched and buffered BCD output at the rear panel. The panel meter’s BCD
information is enabled or disabled by six control lines. When these lines are tied together and
connected to digital ground all of the BCD information is present at the rear connector and can be
read when the DATA READY goes high. When these lines are open all of the panel meter’s BCD
lines are open. This is done so that several meters can be connected to a common bus and strobed
for a reading by grounding the appropriate control lines. The BCD outputs can be interfaced to a
computer or digital printer. The pinout of the rear panel connector is shown in Table 11.
Note
Decimal information from the main board is not tri-stated and should not
be connected to a common bus.
BCD Connector Pinout
BCD Data
Pin Number
BCD Data
Pin Number
1
8
10000
5
2 DIGIT 1
36
PO)
27
4
38
OVERRANGE
26
8
40
ENABLE DIGIT 5
31
ENABLE DIGIT 1
17
ENABLE REMAINDER
34
10
16
3
20 DIGIT 2
14
DIGIT COMMON
28
40
12
DIGIT COMMON
4
80
35
DIGIT COMMON
3
ENABLE DIGIT 2
7
DATA READY
30
Table 11: BCD Connector Pinout
(Continued on next page)
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