UARTs

Location of UART connectors

The MR-CANHUBK3 contains 4 UART connectors (P2, P5, P24, P25)

UART Connectors

P2 and P5 follow the Dronecode 6-pin UART standard. Pin 1 is able to supply limited 5V power to an external device such as a GPS module or sensor.

Connectors P2 and P4:

Pin #	Signal	Specification
1	5V	(Optional) Limited 5V Output
2	TX	3.3V
3	RX	3.3V
4	CTS	3.3V
5	RTS	3.3V
6	GND	0V (GND)

Connectors P24 and P25 are also 6-pin JST-GH. However, they are not fully compliant with the Dronecode standard since pins 4 and 5 are repurposed to be a second UART channel instead of the handshaking lines RTS/CTS. The pinouts are shown below.

Connector P24 (UART9/10):

Pin #	Signal	Specification
1	5V	Limited 5V Output (Optional)
2	TX (UART9)	3.3V
3	RX (UART9)	3.3V
4	TX (UART10)	3.3V
5	RX (UART10)	3.3V
6	GND	0V (GND)

Connector P25 (UART13/14:

Pin #	Signal	Specification
1	5V	Limited 5V Output (Optional)
2	TX (UART13)	3.3V
3	RX (UART13)	3.3V
4	TX (UART14)	3.3V
5	RX (UART14)	3.3V
6	GND	0V (GND)