Walkaround jack interface

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I would like to build a circuit that I can plug into my MRC Command 2000's walkaround throttle connection. I would then connect this circuit to my computer, and be able to drive 2 trains from the computer. So far I have not been able to find any specs on this walkaround throttle connection. I am guessing that there must be some type of serial data interface. I know higher end DCC systems (ie digitrax) suppport direct computer control. However I just got my Command 2000, and don't want to upgrade just yet. What I am hoping to find is someone who knows the pinout of the walkaround controller connection, and any information on the data sent from the walkaround throttle to the Command 2000. Thanks - Jim

-- Jim Pyle (pyle@empire.net), March 27, 2000


The MRC walkaround throttle only uses resistors and diodes to create a variable voltage. The throttles adjust the voltage between 2.5 and about 3.6 volts. The buttons short the output across a variable number of diodes to create 0, .6, or 1.2 volts.

I built a prototype circuit with a DA converter I was able to control 2 trains. Rather than persue this, I think I am going to get a Digitrax system and use the MS-100 pc interface.

Rather thanI think I am

-- Jim Pyle (pyle@empire.net), June 27, 2000.

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