XTA DP226, Operator'S Manual

Page: 53 / 59

DP226 Operators Manual Page 53
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.
To recall more than the first 7 memories, ‘Complex’ mode must be used. Details of
the operation of this mode are covered in the next section.
Note that either individual momentary action or latching switches may be used.
Additionally, a rotary switch may be used for the ‘Simple’ mode, but this will mean
that the seven memories will only be accessible in a linear fashion. Individual switches
allows “Random Access” of the memories in any order which might be more useful.
The type of switch used to build a remote interface is not crucial, but XTA suggest
the following as suitable.
Farnell Components Order Code 176-477 (Momentary Push-button Variety)
Farnell Components Order Code 176-478 (Latching Push-button Variety)
Farnell Components Order Code 176-487 (Mounting Bracket for Interlocking Set)
Farnell Components Order Code 176-516 (Interlocking Cam)
Farnell Components Order Code 176-491 (Round Caps)
Farnell Components Order Code 176-492 (Rectangular Caps)
For a rotary switch we suggest:
Farnell Components Order Code 422-381 (Rotary Non-Shorting)
Note that the rotary switch must be a ‘break before make’ variety, or unpredictable
operation may occur.