My new Remote Control box for the F7, Tender, NB1, and Mikado (in Push mode).
Wired versions have a 4-wire full-duplex UART interface operating at 9600 baud.
Note: Some switches are dual function. So 8 switches provide 12 inputs.
And this is a radio version of the same. But notice it is upside down compared
to the wired box shown above. This is because it is from a newer vintage.
Internally there is a stack of two circuit boards. The switch/LED board,
and a cheap CPLD board that provides the logic functions.
Radio versions include an RFM69 radio module missing from this board as well as
You can see how the application board joins to the generic CPLD board with 4 headers.
The switch/radio board simply plugs onto the CPLD board.
And here is yet another version. This is a "UART" version. It is used inside
a locomotive and has no user controls. It communicates with the locomotive's
Notice that this one is smaller and has less connectors from the previous.
The Apply/Release and the Forward/Reverse switches are momentary center-off.
The Headlight switch is center-off and in the low position operates the Mars light.
LEDs are Red, Orange, Yellow, Green, Blue, and Violet, and indicate
Note: The ribbon wire seen here is only conveying 4 lines: +3.3v, GND, RX, and TX.
The CPLD board can be purchased from places like Amazon.