RS422

wolftec

As anyone been able to use the RS422?
RS232 works great even with RTS but, after setting RS-422 on the bios, i'm onçy able to receive but not transmit.
Using ubuntu, with ver 1.0 bios, and minicom.

wolftec

After further investigation with a logic probe, noting is being sent out for the tx on the transceiver when i select RS-422 and hardware handshake. Also the DTR pin is not set. If i select RS-232 on bios with hardware handshake everything works ok and all signals are ok.

Wilbert

Hi Sir,

Can you provide your Ubuntu version? Kernel version?
I will arrange a test to confirm this problem as soon as possible.

Best Regards,
Wilbert Lee

wolftec

Hello Wilbert,

I've tried both of these:
Ubuntu 20.04 with the kernel 5.4.0 modification as instruted on the wiki
Ubuntu 22.04 with kernel 5.15.0

Thanks for your help

Wilbert

Hi Sir,

Thank you very much for the details, we have reproduced the issue.
The problem is currently being clarified, if there is an update, we will notify you as soon as possible.

Best Regards,
Wilbert Lee

Wilbert

Hi Sir,

Sorry for taking so long to update.
We expect to fix this issue with an official BIOS release next week.

Best Regards,
Wilbert Lee.

Wilbert

Hi Sir,

Thanks for your patience and sorry for the late update.
Attach the updated BIOS, which has been confirmed by AE test first, and can use RS422 mode

Change the BIOS to RS422 mode, test with Ubuntu 22.04, use the tool Minicom, change the Hardware flow control to No, and it can be used.

Best Regards,
Wilbert Lee.

pna

Hello @Wilbert

I see in the BIOS you linked that it is also a change on enabling support for RS485. Which port will support RS485? Is it the port on the HAT-connector or the port on the CN11 (RS-232/422)? Will there be an official release of the BIOS version you linked above?

Thanks.

Wilbert

Hi Sir,

At CN11.
The official version is undergoing an internal validation process, and an update will be released upon completion.

Best Regards,
Wilbert Lee.