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Beginner
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UART cable pin-out

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Hi,

As far as I know the way to interact with the embedded Linux is using a cable connected to the minijack UART port. Does anyone have an schematic of this cable or could point me to somewhere to buy it?

Thanks in advance,

César


Accepted Solutions
Employee
178 Views

We use two parts to make the cable:

 

1. for USB to RS232

http://www.startech.com/Cards-Adapters/Serial-Cards-Adapters/USB-to-Null-Modem-RS232-DB9-Serial-Adap... http://www.startech.com/Cards-Adapters/Serial-Cards-Adapters/USB-to-Null-Modem-RS232-DB9-Serial-Adap...

 

2. and RS232 to 3.5mm jack - RapidRun # 87087

http://www.extak.com/product/3662/C2G-0.5m-RapidRun-RS-232-to-3.5mm-Adapte http://www.extak.com/product/3662/C2G-0.5m-RapidRun-RS-232-to-3.5mm-Adapte

You may find cheaper alternatives or make you own solutions, just ensure the audio jack is pinned like below , and RS232 not TTL (see here for difference https://www.sparkfun.com/tutorials/215 https://www.sparkfun.com/tutorials/215)

The spec is included in the open source schematic (pg17/28)

For a 3 pin audio jack, the connections are as follows:

  • Sleeve = Ground
  • Ring = RXD (Input to Clanton)
  • Tip = TXD (Output from Clanton)

 

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6 Replies
Beginner
178 Views

The serial cable used with the older TiVo boxes should work although I do not have a Galileo board yet to confirm this.

Originally this cable was used to communicate with satellite boxes but it could also be used to get access to the TiVo Linux serial console when you are working with a hacked TiVo.

Cables can be ordered from TiVo here:

https://www.tivo.com/shop/detail/serial-cable https://www.tivo.com/shop/detail/serial-cable

Around $16 including shipping.

I see a few of these cables on eBay as well for about $10 including shipping.

Search for "tivo serial cable"

Here is the pinout of the TiVo cable if someone can confirm this is the same as what is needed for the Galileo board:

http://www.dellanave.com/projects/tivo/tivocable.jpg http://www.dellanave.com/projects/tivo/tivocable.jpg

Beginner
178 Views

Here is my post that confirm OregonDude2U answer:

http://hobbyst.it/intel-galileo/ http://hobbyst.it/intel-galileo/

Employee
179 Views

We use two parts to make the cable:

 

1. for USB to RS232

http://www.startech.com/Cards-Adapters/Serial-Cards-Adapters/USB-to-Null-Modem-RS232-DB9-Serial-Adap... http://www.startech.com/Cards-Adapters/Serial-Cards-Adapters/USB-to-Null-Modem-RS232-DB9-Serial-Adap...

 

2. and RS232 to 3.5mm jack - RapidRun # 87087

http://www.extak.com/product/3662/C2G-0.5m-RapidRun-RS-232-to-3.5mm-Adapte http://www.extak.com/product/3662/C2G-0.5m-RapidRun-RS-232-to-3.5mm-Adapte

You may find cheaper alternatives or make you own solutions, just ensure the audio jack is pinned like below , and RS232 not TTL (see here for difference https://www.sparkfun.com/tutorials/215 https://www.sparkfun.com/tutorials/215)

The spec is included in the open source schematic (pg17/28)

For a 3 pin audio jack, the connections are as follows:

  • Sleeve = Ground
  • Ring = RXD (Input to Clanton)
  • Tip = TXD (Output from Clanton)

 

View solution in original post

Employee
178 Views

here is a nice way to get access to the linux prompt by using an ethernet cable

Beginner
178 Views

Here is a diagram of a cable I made.

It works fine.

The extra connections between pins 4 and 6, and between 7 and 8

make it more independent from the serial port settings.

Novice
178 Views

Hey,

I followed your diagram and couple more from other sources. When I connect RX and TX the console receives everything but cannot transmit. When I plug in the GND, the console freezes not output or input. Any ideas?

I have checked my connections with a multimeter and it seems perfect.

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