Garmin GPS 18X 5Hz to Jetson Tx2 Connection

[Tyagi]

Hello again,

Thanks for helping me out with the Motor Controller problem. I got it working well using the usb.

Now I am working on getting the Garmin GPS 18x 5 Hz connected to the Jetson. Do I need an RS232 to tty adapter for this one as well? Do I connect the input Voltage to 5V from J21 expansion? or the 3.3V connector? of the J17 expansion on the Jetson Tx2 dev kit.

Thank you.

Tyagi

[SuperDroid]

Hey Tyagi,

Glad to hear you were able to get the RoboteQ interface working. The Garmin 18x is powered with 5V and pulls around 100mA. For communication, you will need to convert the RS232 to the Jetson’s TTL serial interface. See the Garmin 18x datasheet for more info.

[Tyagi]

Hello,

Thanks for getting back. So can I hook up the wires accordingly to my Jetson straight up or do I need a converter? Since the Jetson has a 5V pin on the J21 expansion port. I looked up the data sheet for the wire connections and it seems pretty straight forward. I just want to know if I can directly interface or need an adapter?

Thanks a lot!

Tyagi

[SuperDroid]

It can’t be a direct connection for the communication. You will need to convert RS232 to 3.3V TTL. You can find some of our converters/adapters on our website.

[Tyagi]

Hi,

Thanks for the clarification. So would something like this work? https://www.amazon.com/Qunqi-CP2102-Module-Download-Converter/dp/B014PBYER4
or this one from SDR https://www.superdroidrobots.com/shop/item.aspx/usb-to-ttl-serial-cable-ftdi-3-3v-ttl/1232/? They are both very similar.

Tyagi

[SuperDroid]

I’m not familiar with the first converter and the second link is actually a 3.3V TTL to USB cable. I was referring to something like this: https://www.superdroidrobots.com/shop/item.aspx/rs232-3-5v-ttl-type-2-serial-converter-cable/337/

[Tyagi]

Thanks for the clarification. Do you recommend something like https://www.superdroidrobots.com/shop/item.aspx/db15-male-solder-cup-connector/1914/ to solder the gps wires to the female rs232 connector?

So there is no way to convert the rs232 signals to work with a USB input? I am having difficulty detecting, sending or receiving signals to sensors from my Jetson’s J21 and J17 expansion ports.

Thanks a lot.

Tyagi

[SuperDroid]

You would actually need the DB9 variant (https://www.superdroidrobots.com/shop/item.aspx/db9-solder-cup-connector/1836/).

If you would rather use USB, we have a RS232 to USB cable as well (https://www.superdroidrobots.com/shop/item.aspx/usb-to-serial-rs232-adapter-ftdi-chipset-cable/1330/). Note that you’ll need the DB9 female solder cup connector here.

[Tyagi]

Thanks a lot for the information. I will purchase the two items from SDR and test it out. I am having trouble getting my serial ports to communicate with devices so resorting to USBs. I am running into that issue with my Pololu Minimu v5 right now. Does it need some kind of converter as well?

Tyagi

[SuperDroid]

No problem. That IMU is actually I2C and should be a direct connection to the Jetson’s I2C bus.

[Tyagi]

Yep, Just got it to work! just needed to get the permissions setup by running it with sudo.

Thanks a lot for all your help.

Tyagi

[Author]

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