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#1
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Re: Fried Ethernet Ports
2077 had a physical port failure in competition this weekend, followed by complete control system failure which we presume, but haven't proved, was related.
In setting up for our next-to-last match one of the ports broke (we use both, one for field and one for a dashboard/video feed to a laptop). They finished the match OK, minus the laptop connection. We didn't have time to swap in a backup for the next match, so we ran it the same way. This time nothing, as in "robot didn't move at all". The odd thing is that when we brought it back to the pits and tethered, everything seemed fine. It was a real downer to end the competition on this note, but more troublesome is having an undiagnosed major major system failure with another competition coming up soon. The plan now is just to get another DS and hope that fixes it (the broken unit is in the crate and on its way), but it would be great if someone could help us make sense of the situation. Any advice? |
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#2
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Re: Fried Ethernet Ports
The HALO TG110-S055N2RL part is available from Future Electronics for $4.70 each, http://www.futureelectronics.com, order online and have it a week later. Prior to voiding the warrantee by opening the case I suggest contacting FIRST to see if they will replace under warrantee. Based on what I saw on one of our damaged units (both ports) the HALO isolation transformers are getting damaged as the signal activity on either side of the 1:1 transformer is different. It is unclear whether the damage propagates beyond the HALO part to the Davidcom chip, but things looked promising at the Davidcom to HALO interfaces.
In the case of no waranntee replacement, I would spend the $5 or $10 to try the repair and then have a non-competition DS (better than a paperweight ). The part is 16 lead Surface Mount and can be replaced by someone with a little skill who is careful not to lift the copper pads.We implemented a practice of always connecting a wire with series 1 MOhm resistor between the cRio case and the DS case prior to connecting the Ethernet line. The wire connection is maintained at all times during tethered operation and removed only after the Ethernet cable is unplugged. Prior to this we blew 3 DS Ethernet ports, since none. |
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#3
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Re: Fried Ethernet Ports
Quote:
When you are faced with "it doesn't work at all", the best thing you can do is to isolate the potential problem. In this case, I would suspect your second DS port is on the way out (probably loose in the board). When you get your hands on the DS again, connect it up to a PC with an appropriate IP address and see if the Eth light blinks rapidly. Check if the PC can "ping" the DS. See if the light drops in and out if you GENTLY move the ethernet port. Regardless of that type of diagnostic, and given that your team is using two ports anyway for your dashboard, at your next competition I would get over to Spare Parts and try to get a loaner DS. |
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#4
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Re: Fried Ethernet Ports
We broke both of the ports off of our first DS. Between tethering the robot and connecting to the field, the connectors had just had it. From what I can see, the plastic housing over the ports doesn't seem to be connected anywhere but board itself, and could probably use a bit of strain relief.
Our short term solution is a couple of short cat5 cables with F/F adapters on the end. Does anyone have insight on whether that would be competition legal? Or should I go to the Q&A with this? Last edited by Tom Bottiglieri : 16-03-2009 at 10:53. |
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#5
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Re: Fried Ethernet Ports
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We've got a thread over here: http://www.chiefdelphi.com/forums/sh...threadid=75281 And Bob is saying no, it's not legal. |
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#6
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Re: Fried Ethernet Ports
Quote:
Also appears to be some amount of epoxy, but that won't cut it as we are seeing. Quote:
If you do not use both connectors on the field one potential solution is to leave a secured cable connected to one of the ports and use that to interface to a small switch. When not on field, connect this to a 5-port switch/hub (use the kit one with wireless disabled if you want) and plug your robot and programming or debugging laptop in to that switch. This will cut out any non-match wear on the ports, and has the side benefit of some limited ESD protection for the ethernet port. |
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