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Author Topic: Male connector for GuruPlug UART/JTAG ports  (Read 8245 times)
nocnokneo
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« on: July 27, 2010, 05:31:29 AM »

I didn't pay for the overpriced JTAG box that Globalscales sells as an option with the GuruPlug. Now I'm trying to get serial console access to the 4-pin 3.3V UART connector. Has any one been successful in finding a male connector for this port (e.g. on Digikey)? If anyone has a hi-res photo of the actual UART connector that comes on the official JTAG breakout box, that would be very helpful!
« Last Edit: July 27, 2010, 06:13:12 AM by nocnokneo » Logged

two9er
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« Reply #1 on: July 27, 2010, 07:51:30 AM »

Resolution to 1/100 inch:


* guru_serial_connector.jpg (71.96 KB, 890x1046 - viewed 3082 times.)

* guru_serial_connector_2.jpg (92.46 KB, 1374x1260 - viewed 3111 times.)
« Last Edit: July 27, 2010, 08:15:06 AM by two9er » Logged

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nocnokneo
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« Reply #2 on: August 01, 2010, 08:05:09 PM »

Thanks for the photos! I think I found what I was looking for on Digikey. I'll report back.

2-pin plug - $0.32:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=WM1720-ND

4-pin plug - $0.46:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=WM1722-ND

8-pin plug - $0.70:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=WM1726-ND

Crimp sockets for 28-32 AWG wire - $0.59 for 10:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=WM1775-ND

If you look at the datasheet for the (expensive!) crimp tool, there's a detailed view of how a crimped socket is supposed to look:
http://www.molex.com/pdm_docs/ats/ATS-638190400.pdf
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jkpeters_37
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« Reply #3 on: August 12, 2010, 03:33:09 AM »

Did this work for you?  From the pictures it looks to me like the pitch is 1.0 mm not 1.25 mm.
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nocnokneo
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« Reply #4 on: September 09, 2010, 06:16:40 AM »

Yep, this connector worked for me and UART connection is up and running!
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robertut
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« Reply #5 on: October 30, 2010, 11:27:58 AM »

Yep, this connector worked for me and UART connection is up and running!
Hello!

How did you do it, what adapter did you use?

I found a Russian blog describing how to make a UART connection to the GuruPlug with a Nokia CA-42, or DKU-5 cable
http://habrahabr.ru/blogs/DIY/101990/
(based on http://buffalo.nas-central.org/wiki/Use_a_Nokia_Serial_Cable_on_an_ARM9_Linkstation)
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nocnokneo
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« Reply #6 on: October 30, 2010, 12:26:39 PM »

We used the 4-position female housing connector:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=WM1722-ND

with these connection terminals:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=WM1775-ND

Here is the way overpriced hand crimp tool that we did NOT buy:

http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=63819-0400

We just looked at the datasheet for the crimper which shows in detail how the connectors should be crimped and carefully copied that by bending the connectors with tiny flat blade screwdrivers and hemostats. Good luck!
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robertut
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« Reply #7 on: October 30, 2010, 12:37:39 PM »

Thank you. But my question is: what JTAG adapter did you use to connect it to the PC? There are hundreds of JTAG boards out there, even with the same chip as the one sold Globalscale Technologies, Inc. overpriced. Do you use a cheaper model? Can you share the connection schematic?

Million thanks in advance.
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nocnokneo
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« Reply #8 on: October 30, 2010, 12:40:50 PM »

It sounds like we have different goals. I just wanted access to the TTL-level UART signals TX, RX, and GND. If you want access to the JTAG signals you will have to go to a lot of hassle to *maybe* save $10 over the official JTAG connector that Global Scale offers.
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robertut
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« Reply #9 on: October 30, 2010, 12:50:23 PM »

What did you use for the TTL-level UART signals, and how? Did you connect it to a serial port?
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robertut
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« Reply #10 on: October 30, 2010, 12:55:52 PM »

*maybe* save $10 over
Unfortunately it's not a 'maybe'. Shipping doubles the price.
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nocnokneo
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« Reply #11 on: October 30, 2010, 01:15:57 PM »

We used a FTDI USB-Serial chip (like what you find at sparkfun.com). It accepts 3.3-level UART so there was nothing else needed.
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corecode
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« Reply #12 on: December 11, 2010, 04:57:48 PM »

I can confirm nocnokneo.

It seems that the header on the board is a Molex PicoBlade [1], the header for UART is likely [2], and for JTAG [3].  I'll let you know once I get the plugs.

[1] http://www.molex.com/molex/products/family?key=picoblade&channel=products&chanName=family&pageTitle=Introduction
[2] http://www.molex.com/molex/products/datasheet.jsp?part=active/0510210400_CRIMP_HOUSINGS.xml&channel=Products
[3] http://www.molex.com/molex/products/datasheet.jsp?part=active/0510210800_CRIMP_HOUSINGS.xml&channel=Products
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