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Reply to "Arduino TMCC signalling"

@Patentguy posted:

In addition to the voltages I sent a day or so ago that I took with the MAX converter in place, I disconnected the RS232 from the MAX and took measurements directly from the female end of the RS232 connector. The only significant voltage I found was +5V between pins 5 and 9. I then checked the DC voltage between Pin 5 and 3. When I pressed the 'Horn" button on the controller the reading went from 0.0 to 70mv while the horn was depressed.

Hi David -

If you have a Legacy base, the voltage between pins 5 and 3 should be about -7.5 VDC (I just checked on mine).  (True RS232 signaling holds the TX line at a negative voltage when idle.)

I am not sure where to go from here... there could be an issue with the cable you are using to connect to the Legacy base, as I mentioned above.

Do you have the Legacy Y-cable that came with your command base, or a SER2 module?  You could try the serial connector on one of those, but you ought to be able to read commands at least direct from the base,

Last edited by Professor Chaos
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