Page 36 DP6i Operators Manual
Appendix 3: Additional Information: General Purpose Interface
The GPI (General Purpose Interface) allows the recall of memories via an external
switch box, alleviating the need for a computer system when only memory changes
are needed.
This information is reproduces in the application note that accompanies the GPI kit
itself. The following parts are contained in the GPI Kit.
• One GPI Interface card;
• One 15pin D-type to 9pin D-type adaptor;
• One male 15pin D-type with hood;
• Software upgrade disk;
• One application note.
Hardware Installation.
Ensure that the unit is switched off and that the power cord is removed from the
mains supply!
Position the unit so that the front panel is facing you, remove the seven retaining
screws from the top cover and place the screws and cover to one side. Now locate
the RS232 card and remove the retaining bolts (5mm) from the rear of the unit and
unclip the connector from the main circuit board. The card can now be removed and
the GPI card put in its place. Be sure to tighten the retaining screws but be careful
not to strip the thread.
The installation of the card is now complete - please replace the top cover.
What can I do with the GPI interface?
The GPIP interface allows the recall of the first 7 memories in your DP6i via a
simple contact closure interface. The rules for what is recalled are simple: If you
have stored something in input memory number ‘N’ and x-over memory number ‘N’,
they will both be recalled when you select ‘N’. If only an input memory is stored at
number ‘N’ it will be recalled on its own, and similarly for the case of only a x-over
memory. Trying to recall a location where no memory is stored will not do anything.
What do I need to plug in to recall a memory?
On the following page there are two example circuit diagrams of GPI switches. The
first is a self powered version, that is it takes its power from the unit and is therefore
not fully isolated from the unit. The second diagram is a powered version, this gives
full isolation from the unit, it should be noted however that no more than 10v
should be used to activate the opto isolators as damage could occur.
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