Page 56 DP226 Operators Manual
How Do I Trigger a Memory Recall?
As can be seen from the schematic diagrams, the ‘Simple’ mode of operation just
involves connecting a single pin of the socket to a positive supply, derived either from
the unit (non-isolated – ground must also be connected from pin 5 to pin 9), or from
an external supply. In the case of the external supply, its ground must be connected
to pin 9 to complete the circuit. In both cases, only a momentary action switch is
required, but latching ones may be used if a physical indication of the remote memory
selected is required.
For the remote recall of more than the first 7 memories, the ‘Complex’ mode must
be used. This involves presenting a 5-bit binary number on the pins originally used for
initiating individual memories in ‘Simple’ mode. Use the ‘lowest’ five pins (for
memories 01 to 05 in ‘Simple’ mode. The following table details how to recall
memories in ‘Complex’ mode. A ‘1’ below a pin number corresponds to a positive
voltage (at least 2.5V, but no more than 10v) on that pin; a ‘0’ means ground (or open
circuit). So, for example, to recall memory 13 pins 8, 10, and 3 need to be ‘pulled
high’ with a positive voltage. As with the ‘Simple’ mode, this need only be a
momentary action, but may be latched (permanent) if some form of remote static
indication is required.
15-Pin Interface Connections
Memory Number Pin13 Pin10 Pin8 Pin4 Pin3
01 0 0 0 0 1
02 0 0 0 1 0
03 0 0 0 1 1
04 0 0 1 0 0
05 0 0 1 0 1
06 0 0 1 1 0
07 0 0 1 1 1
08 0 1 0 0 0
09 0 1 0 0 1
10 0 1 0 1 0
11 0 1 0 1 1
12 0 1 1 0 0
13 0 1 1 0 1
14 0 1 1 1 0
15 0 1 1 1 1
16 1 0 0 0 0
17 1 0 0 0 1
18 1 0 0 1 0
19 1 0 0 1 1
20 1 0 1 0 0
21 1 0 1 0 1
22 1 0 1 1 0
23 1 0 1 1 1
24 1 1 0 0 0
25 1 1 0 0 1
26 1 1 0 1 0
27 1 1 0 1 1
28 1 1 1 0 0
29 1 1 1 0 1
30 1 1 1 1 0
31 1 1 1 1 1
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