The NceCabBus library allows you to interface to a NCE Cab Bus via an RS485 Interface and provides examples that implement the following devices:
- Throttle with a 128x32 Pixel OLED Display, a 4x4 Keypad and a Potentiometer Speed knob
- Auxiliary Input Unit (AIU)
- FastClock that outputs the time to the Arduino Serial Port.
The library does not provide the actual RS485 interface - it only provides the logic to process NCE Cab Bus messages, however the examples show a simple connection to a common RS485 chip and drive the TX Enable directly.
ASCII schematic of connecting a half-duplex RS485 transceiver e.g. MAX487CSA+ to a microcontroller. Note: the /RE & TE pins on the RS485 chip are connected together and connect to the Arduino pin defined by RS485_TX_ENABLE_PIN in the examples
----+
|
AVR | /|
| / | A
| / +-------+
| RO / | |
RX +-------------+ | |
| \ | B |
| /RE o o---+ *-------------- RS485 A/+ Cab Bus Pin 3
| |\ | | |
| | \| | |
TE +---------------* | |
| | | |
| |\| | |
| | + TE | |
| | \ B | |
| DI | o----*---|-------------- RS485 B/- Cab Bus Pin 4
TX +-------------+ \ |
| | + |
| | / A |
| | +--------+
| | /
| |/
|
GND +--------------------------------------------------- Cab Bus Pin 2
|
----+
