Aux 2 Serial Port issues on Octopus Pro

[timothyz]

Hi,
I am having issues with the AUX 2 serial not loading right with board.txt with an octopus pro. Here is my baord.txt (with 3.5.3)

board.txt:
//Config for BTT Octopus Pro v1.0 F429 Version
serial.aux.rxTxPins = { PA_10, PA_9 }
serial.aux2.rxTxPins = { PD_6, PD_5 }

Here is where the error is in config,g:
M575 P1 S1 B57600 //This works fine, using for CNC pendant, works great actually.
M575 P2 S7 C"RS485" B9600 // Error in console: Error in start-up file macro line 49: in file macro line 49: M575: parameter 'P' too high

Any hints on what could be the issue, I searched here and the Team Gloomy Discord and could not find anything wrong with my config.

[timothyz]

@timothyz
Ok, well, I just found the answer:
A list of the UART ports are here https://teamgloomy.github.io/board_txt_stm32.html#uart-useable-pins---stm32h7-based-boards
Board.txt Configurables Applicable to STM32 | RepRapFirmware for LP...
Details of each item that can be configured in Board.txt and which build they are applicable to
However in 3.5 and below we only support 2 UART connections. 1 for a WiFi module and 1 for a screen or other device
In 3.6 this has been increased to 3. 1 for WiFi and 2 for other devices
Looks like PB6 and PB7 are available on the EXP headers

[jay_s_uk]

@timothyz rs485 is also only available in 3.6