Taranis IO ports
- left - battery connector
- middle - SD card slot
- right - serial port connector
Pins from left to right:
| name | function | PC connection |
|---|---|---|
| GND | ground | connect to pin 5 of PC serial port (ground) |
| VMAIN | Battery voltage (software switched) | |
| UART_T | transmit line from Taranis | connect to pin 2 of PC serial port (RX line) |
| UART_R | receive line of Taranis | connect to pin 3 of PC serial port (TX line) |
Serial port connector is a JST PH Series connector (it uses 2mm pitch). It can be found here:
- Female PHR-4 https://www.digikey.ca/products/en?mpart=PHR-4&v=455
- Male S4B-PH https://www.digikey.ca/products/en?PPV=1812-3-608606
All modes use 8 data bits, 1 stop bit, no parity and no flow control. The baud rate depends on what the serial port is set to. Radios menus HARDWARE screen, Serial port setting:
| setting | speed [bps] | description |
|---|---|---|
| S-Port-Mirror | 57600 | outputs all SPort received telemetry |
| Telemetry | 9600 | receives telemetry stream on this port, output none |
| Debug | 115200 | only enabled in OpenTX debug builds - debug output |
Taranis serial port uses RS-232 polarity for RX and TX signals, but it won't output full RS-232 voltage levels (from -15V to +15V) on TX line. The RX input is RS-232 tolerant. Still it will work with most standard serial adapters (even USB serial adapters).
| logical level | RS-232 standard | Taranis level |
|---|---|---|
| 0 | 15V | 3.3V |
| 1 | -15V | 0V |
Pins from top to bottom (corner):
| Name | Function |
|---|---|
| OUT | PPM/PXX/DSM2/DSMX/SBUS/Serial control signal |
| HEARTBEAT | SBUS/CPPM trainer input |
| BATT | Battery voltage (software switched) |
| GND | Ground |
| SPORT | Telemetry in/out (common with internal module on non 2019 models), Crossfire control and telemetry |
The OUT, HEARTBEAT and BATT pins are at the same voltage as the transmitter battery. The output current for the OUT and BATT pins are limited by a 10 kΩ resistor. Read more here...