Posted: 4/7/2017 1:39:37 PM EDT
| Anybody else work with rfids and have much working knowledge of EPC2? I'm here in northern Africa right now, and had about 1000 active tags get shut off during shipment from Turkey to Egypt. The access codes on the p400 passives was stored in an unusual place in the user memory (by design) and when reviewing in taglab, they weren't wiped to 0000s, but restored to default. So I'm at a loss. What the hell could return a bunch of gen 2 EPC2 chips to default? Never seen anything like this before. As a fun side note, I was forced to come up with a field activation kit, and field engineering is always fun. |
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What class of gen 2 chips?
Was it verified correct prior to shipment? (Nobody checked if verified after write) Was it locked to prevent accidental changes? From an issue I heard about on Gen 2 class 4 some have had unintentional resets iirc By no means an expert. Wife still uses them in current role in Africa and I did in past as well. (Sub-Saharan) |
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Default in the user memory space, or default in the ID space?
I haven't dealt with them much, just playing around at hobby level. I know the new ones come with a few kilobytes of storage, is that what you are referring to? Either way, if all of them (how many?) were reset, I'd contact the manufacturer and see what they know, they might want a sample if it was a deliberate re-write if password was unknown. |
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Quoted:
What class of gen 2 chips? Was it verified correct prior to shipment? (Nobody checked if verified after write) Was it locked to prevent accidental changes? From an issue I heard about on Gen 2 class 4 some have had unintentional resets iirc By no means an expert. Wife still uses them in current role in Africa and I did in past as well. (Sub-Saharan) |
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Quoted:
Default in the user memory space, or default in the ID space? I haven't dealt with them much, just playing around at hobby level. I know the new ones come with a few kilobytes of storage, is that what you are referring to? Either way, if all of them (how many?) were reset, I'd contact the manufacturer and see what they know, they might want a sample if it was a deliberate re-write if password was unknown. |
