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@KEALgopher posted:

will RS 2.5 work on ERR  dc commander in TMCC?

Yes, it should be fine. Basically, just connect the serial line from the DC Commander to the appropriate pin on the RS2.5 board.

The wild card is if you're using it for steam, some versions of the RS 2.5 boards didn't get the chuff via the serial data and needed a direct chuff input.

Kinda/sorta, but maybe not really. Early RS2.5 systems (first two years or so) will not respond to chuffs on the serial line, that's true. They were only designed to chuff with a hall-effect sensor, cherry switch or reed switch attached. This is a limitation of the PIC chip installed on the board, not the board itself. (PIC chips below RS25S24 are generally the ones affected.)

Having said that, is there ANY case where the DC or AC Commanders encode the chuff on the serial line? I wasn't aware that was a function of those boards.

TRW

@PaperTRW posted:

Kinda/sorta, but maybe not really. Early RS2.5 systems (first two years or so) will not respond to chuffs on the serial line, that's true. They were only designed to chuff with a hall-effect sensor, cherry switch or reed switch attached. This is a limitation of the PIC chip installed on the board, not the board itself. (PIC chips below RS25S24 are generally the ones affected.)

I don't see where you're saying anything different than I did, "The wild card is if you're using it for steam, some versions of the RS 2.5 boards didn't get the chuff via the serial data and needed a direct chuff input."

I realize it's the chip that has the issue, but unless he's going to swap chips, it's a moot point.  

@PaperTRW posted:
Having said that, is there ANY case where the DC or AC Commanders encode the chuff on the serial line? I wasn't aware that was a function of those boards.

Every AC or DC Commander I've installed in steam has encoded the chuff on the serial line.  I just solder the chuff input to the back of the R2LC connector on pin 17.  The R2LC has always been able to encode the chuff, at least all the versions ever shipped with the ERR stuff.  It's true they didn't wire it to the screw connectors, but that's strictly a very minor inconvenience.

Yes, power and serial data are available on the ERR Commander boards and you can feed the RS 2.5 board directly with that power and serial data.

Here's the pinout of the RS 2.5 4-pin connector, note that the 5VDC line is an output and you won't be using it here.

The ERR Commander boards, AC, DC, Cruise, Cruise-Lite all have the same pinout of the 4-pin sound board connector..

  • Pin-1 - Center Rail
  • Pin-2 - Ground
  • Pin-3 - unused or logic horn/whistle
  • pin-4 - serial data out

Note that pin-3 won't be used here, it should be unconnected.

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