USB-to-UART adapter specifications

[Carlos Prieto López]

Hi,

I'm looking for a USB-to-UART adapter for mi gnubee. I found one that specifies

FTDI FT232RL USB to UART TTL

it has two possible voltages: 3.3 and 5V, and two possible configurations, stated as follows:

Tip-TXD, Ring-RXD

Tip-RXD, Ring-TXD

Can anyone tell me if one of these is suitable for the gnubee?

Thanks in advance.

[Miles Raymond]

Is this for the 3.5mm jack? You can also use the UART pins and plug into them directly. I believe only 3.3V is necessary, as the UART I use is only 3.3V.

[Carlos Prieto López]

Yes, it is for the 3mm jack.

If I used the UART pins, what would be the connection order?

Thanks.

[Miles Raymond]

The documentation is really spread out all over the place.

http://gnubee.org/USB_to_UART/README.html on the official site seems to be out of date

https://github.com/gnubee-git/GnuBee_Docs/tree/master/USB_to_UART seems to be the (newer) source for the site but still incomplete

https://github.com/gnubee-git/GnuBee_Docs/blob/master/GB-PCx/Assembly/PC2/2.png shows the pin header near the 3.5mm port

https://github.com/gnubee-git/GnuBee_Docs/blob/master/GB-PCx/Documents/Silk-Screen_B.pdf shows GND nearest the 3.5mm port, followed by TX, then RX

GND is most important to connect, then using the settings 'Baud Rate: 57600 / Data Bits: 8 / Parity Control: NO / Stop Bits: 1 / Handshake: NO' to connect, connect the RX/TX of from the USB-serial adapter and see if you get any output, or swap the RX/TX and then see if you get any output.