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13
BCD Option
13.10 6 DIGIT AT A TIME CARD ADDRESS
Jumpers S2A and S4A are removed for full parallel (6-digit output).
If jumper S3A is installed, the outputs are enabled by line P8-L20 ALONE: a
low level enables the outputs when jumper S5C is installed, and a high or
open level does the job if S5C is removed.
When jumper S3A is removed, the outputs are enabled only when the
selected 4-line address is applied to P8-U19, L19, U20 and L20. Each of
these four is exclusive-OR'd with its jumper, and the following four outputs
are AND'd to create a 1 of 16 enable code.
If jumper S5A is installed, P8-U20 must be LOW to enable the card (BIT 2).
If jumper S5C is installed, P8-L20 must be LOW to enable the card (BIT 1).
If jumper S5E is installed, P8-U19 must be LOW to enable the card (BIT 8).
If jumper S5G is installed, P8-L19 must be LOW to complete enabling the
card outputs (BIT 4).
Figure 13-3. Address Programming Chart for 4 -line Address
NOTE: "X" in chart indicates jumper that must be installed.
Note
EXAMPLE: For a positive true address of 03, install jumpers S5-G and
S5-E.
If any of these jumpers are removed, the corresponding line must go HIGH
or OPEN to assist the card enable; if all four jumpers are missing, for
example, the card outputs are enabled ONLY when all four lines are HIGH or
OPEN, a ground on any of the four input lines causes the outputs to go the
high impedance state.
13-5
BINARY BIT
1
JUMPER S5–
C
00
X
01
02
X
03
04
X
05
06
X
07
2
4
8
A
G
E
X
X
X
08
X
X
X
09
X
X
10
X
X
11
X
X
12
X
X
13
X
14
X
15
1
2
4
8
C
A
G
E
X
X
X
X
X
X
X
X
X
X
X
X
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