Re: Apple II to 4-20ma |
Author: Michael J. Mahon Date: 22 Jul 2014 11:25 pm Ref: 1 |
Do you only need digital output (just two states), or do you need
continuous control (analog) over the 4-20ma range?
Digital is easy, and can be done with an annunciator output, an emitter
follower, and a current limiting resistor.
Analog is also possible, but will require either a hardware D/A converter
or, if the Apple can be monopolized during signal generation, a software
DAC (for relatively slowly changing signals).
If you need analog, what resolution and bandwidth do you require?
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-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon