GM862 serial port question on the EVK V3 board...

Wireless & IoT
1

I have a weird issue with the GM862.

I have a python script running which gives me a command line like:

READY:

If I use a terminal program I can send it commands like :

status

and it sends me back info.

NOW, if I hook up the serial port to my Axis SBC, and have IT send the same command, I see the echoed characters, but it NEVER responds!

I’ve verified the is sent, and that the SBC is sending exactly the correct string…

One hint, when I re-hookup the terminal program, and press enter, it triggers a response, and I can see a lot of ‘pent up’ commands sitting on the GM862 side…

Is this a RTS/CTS issue?

Note I have the GM862 send a ‘Hello!’ message every 2 seconds, and my SBC DOES receive this!! It just never gets its command executed!

Are there RTS/CTS issues with the EVK V3 board?

Driving me crazy!

Thanks

2

Ealbears,

I had similar issues with the evaluation board and it was found that the RTS and CTS lines were routed incorrectly. To fix it, remove the solder jumpers on the RTS and CTS traces and cross-wire them. The hardware flow control should then work.

Cheers!

Greg

3

Well, I have a V3 board, and it has X’ed jumpers at the bottom left labled RTS/CTS, so it looks crossed already