Herelink connections to a Matek H743 SIM V3

Could I please check with the experts the correct wiring when connecting a Herelink to a Matek H743 Slim V3 as I’m not having much success?

Herelink UART connector

Herelink RXD to the H743 TX1 (Serial 2)

Herelink TXD to the H743 RX1 (Serial 2)

Set SERIAL2_PROTOCOL= 2

Any spare UART should work.

Herelink SBUS

Herelink S Bus out 1 to H743 TX6 (Serial 7)

Herelink GRD to a H743 GRN

SERIAL7_PROTOCOL=23 (RCIN)

SERIAL7_OPTIONS=3 (SwapTXRX) – don’t understand this one???

Any help will be appreciated!!

This works.

Herelink SBUS

Herelink ‘S Bus out 1’ to H743 RX6 (Serial 7)

Herelink GRD to a H743 GRN

SERIAL7_PROTOCOL=23 (RCIN)

SERIAL7_OPTIONS=3 (SwapTXRX - RX6 becomes TX6).

Herelink UART connector

Herelink RXD to the H743 TX1 (Serial 2)

Herelink TXD to the H743 RX1 (Serial 2)

Set SERIAL2_PROTOCOL= 2