+5V (Device Supply Voltage)
Display supply voltage pin. This pin supplies the MatesBUS with 5VDC from the Raspberry Pi.
GND (Module Ground)
Device ground pin.
TX (Serial UART Transmit – MatesBUS)
TX of the MatesBUS connects to RX of the Raspberry Pi, this is the 3.3V Asynchronous Serial UART Transmit for communications between the device connected to the MatesBUS headers and the Raspberry Pi.
RX (Serial UART Receive – MatesBUS)
RX of the MatesBUS connects to TX of the Raspberry Pi, this is the 3.3V Asynchronous Serial UART Receive for communications between the device connected to the MatesBUS headers and the Raspberry Pi.
RESET (MatesBUS Reset)
This pin is primarily connected to the BBM-Prog header, for programming the connected MatesBUS device, such as the TIMI-96. Is it also connected to the Raspberry Pi via a 680ohm resistor to Pin7 (GPIO_4), making it possible for the Raspberry Pi to initiate a reset of the MatesBUS device as required.
NC (Not connected)
These pins are not connected or used on the MatesBUS by the Raspberry Pi.