Gilderflukeco Quad Piggyback Digital to Analog converter Manual de usuario descargar pdf (Pagina 3)

The first two channels are used and connected (if the data isnÕt being used as a

source for an analog signal) just like any other standard 1/4 J6.

The TTL level test data is fed to the test inputs on the Quad Piggyback D/A card.

Standard 1/4 J6 output data from a programming console, Togglodyte, or other

source must not be fed directly into this input. A TTL BUFFER must be used to convert the

relatively high voltages (15 to 24) found on a standard 1/4 J6 to TTL levels (5 volt). If the

Quad Piggyback D/A cards are being installed in a card cage, the eight data bits for this

channel (wires 22 through 29) should be bussed down the backplane to connect all of

the slots with Quad Piggyback D/AÕs in them. A single TTL BUFFER can then be permanently

connected to this buss to send test data to any Quad Piggyback D/A card in the cage.

Using the test function:

When TTL level data is being sent to the test inputs on a Quad Piggyback D/A, any

analog channel can be told to use this data as a source by simply turning on the

appropriate dipswitch on the Quad Piggyback D/A card. Any number of these can be

switched on at the same time, and all of them will follow the command signals coming

down the TTL level Test Buss.

If the function an analog output is attached to can be damaged by sudden

movements, it is a good idea to write down the normal ÔparkedÕ command position it so

that the test command levels can be matched when you switch in to or out of test mode.

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Gilderflukeco Quad Piggyback Digital to Analog converter Manual de usuario Pagina 3