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Chapter 8 Interface Operations
General
The 4100 Series of ohmmeters is now available with a choice of two data outputs. The standard
output provides data in a binary-coded-decimal format. The latest data output available is a parallel
printer port for connecting directly to a Centronics compatible printer. Both interfaces are described
below.
BCD Interface
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 (overrange)
26 +5 VDC 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.
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General