16
Chapter 8 - Interface Operations
BCD Interface
Option BCD has a rear mounted 50 pin Amphenol connector providing data in a parallel binary-coded-
decimal (BCD) format. The outputs are TTL compatible and may drive 1 LS load. The summary of pin
functions is provided below and on the schematic number 2053-076 at the back of this manual.
Pin Number
Data
1
1
2
2
3
4
4
8
6
10
7
20
8
40
9
80
11
100
12
200
13
400
14
800
16
1000
17
2000
18
4000
19
8000
21
10000
22, 40
20000 (Over Range)
26
+5VDC Supply
50
0 VDC Common
35
End of Conversion on negative transition
(A high signifies "Busy")
45
Display Hold Line (+5V or open = Run; 0V = Hold)
The BCD outputs are fully compatible with the Valhalla Model 1248 BCD Comparator. When connecting
to the comparator using the standard IDC-2 interface cable, the end of the cable possessing the wire
break-outs is connected to the Model 1248.
