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Thread: how long is your serial extenision for xenarc 7in ts?

  1. #1
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    how long is your serial extenision for xenarc 7in ts?

    Any of you Xenarc 7in TouchScreen owners using an extension for the serial touchscreen?

    How long is it?

    I have a 25Ft routed under the carpet in my car now, but it seems to be giving me a few problems (possibly signal degradation). I may step down to a shorter length, or try a usb adapter or rj45 extension.

  2. #2
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    25ft? You drive a school bus?

    I am running a 16ft (10+6) on my touchscreen with out issue. I did try 26ft (10+10+6) for just a couple hours and it did work but that was in the house and not incar near power lines.

    USB seems to be a good option. I tried it and it did work partially, I was just having driver issues that made me decide to go with straight serial.
    Do you plan to run serial over the rj45 (wouldn't think that was possible with only 8 wires) or do you use one of those units with the converters on each end?

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    No, I drive a stretch hummer.

    Not!

    25Ft was overkill. My thinking was plenty to spare If I want to move the system around later and only pennies more. Now, I wish I chose the 15ft cable.

    The problem I'm having is stability. It does work, but sometime causes windows to fail when loading drivers. It doesn't fail gracefully, like touchscreen not found error, but instead causes a blue screen or keeps windows from loading altogether.

    That gives me 3 options:
    1. Shorter Serial Cable (15ft)
    2. USB to Serial Adapter and 10-15ft USB Extension
    3. RJ45 Adapters and 15ft cable

    mtmsol suggested this RJ45 adapter http://www.startech.com/ststore/item...ar=topbara.htm

    I guess I was hoping somebody else was running a 25ft or longer extension, and that they knew some magical solution to make it work. Time to price out the above options instead.

    Thanks. If you got 20ft to work, I hope a 15ft cable will do the trick for me. It is close to a power cable and vga cables, so I may need something with good shielding.

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    I got my cables from CCT. Dirt cheap stuff and I have it next to a lot VGA and power cable for the whole 15ft without issue. I was also surprised that it is pretty good quality cable. Minimum order of $5.

    10Ft $1.50

    6Ft $1.00

    But the RJ45 option looks very good as well, crimp your own cable and if you ever move it you can just make a new one with exact length. I don't know how RJ45's twisted pair approach compares to serial cable's actual shielding when you are transferring serial data. I thought that the reason RJ45 works so well over distance was because of the twised pairs and how network traffic is sent, I don't know if you would get the twisted pair benefit if you are sending serial data over it. Hope that made sense.

    Either way, good luck.

  5. #5
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    I have about a 15-20 ft extension for the touchscreen but it uses telephone wire and there are only 2 wires required to connect the touchscreen to the computer so it really only uses 2 of 4 telephone wires. Works perfectly every time! I also use telephone wire to extend the USB connection on the D-Link USB radio over the same distance.

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    The quickest solution eluded me.

    I chopped off about 7-8Ft of the serial cable. So far so good, but only time will tell if the problem is solved.

  7. #7
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    Originally posted by Moose
    I don't know how RJ45's twisted pair approach compares to serial cable's actual shielding when you are transferring serial data. I thought that the reason RJ45 works so well over distance was because of the twised pairs and how network traffic is sent, I don't know if you would get the twisted pair benefit if you are sending serial data over it.
    Twisted pair cable is for differential signalling. The noise is induced equally in both cables, and the differential amplifiers at each end remove the noise. You can't get this benefit from standard RS232. You'd have to move to something like RS422 or RS485.


    Rob
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

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    Unfortunately, even after chopping the cable, the problem persists. I tried an old 10ft serial modem cable, but it still fails to boot occasionally.

    Moose uses a 10ft extension, so I don't see why it won't work for me. I thought it might be drivers, so I reinstalled them. But, its still no go.

    Possibly a defective touch screen controller or could the touchscreen controller be failing due to heat?

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    Has it every worked? Have you been able to get it to work in the house on a cool night? Good luck.

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    Yes, it does work in the car at times flawlessly and always worked fine inside the house without the extension.

    I've tried switching back to the older driver that came with the screen instead of the one posted on the website. Its working atm with the 10ft serial extension. But because the problem is sporadic, its hard to tell if the problem is fixed. I will only know the next time it fails...

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