There are a few things that have been brought up by those testing. I just wanted to point them out so others will know about them. These are things that I've been able to reproduce and explain.
1. When changing universes while powered on, the previously selected universe is still active.
Explanation: This is the designed behavior of the Ex/Rx. The universe change will not take effect until the Ex/Rx is powered off and back on again. The universe selection occurs during the Ex/Rx boot sequence.
Solution: When changing the universe setting on the DMX Tester, you must cycle the power off and back on again to the get the Ex/Rx to detect the new universe setting.
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2. When testing with the LE and setting it to wired while leaving the Ex/Rx in place, the data light shows DMX is being received, but no light output occurs.
Explanation: This is an LE issue. The same thing happens with any DMX source (dongle, DMX Tester, etc.). I have no idea if this issue is already known with the LE. In any case it's not a DMX Tester related issue.
Solution: If you're changing connectivity from wireless to wired, you'll have to remove the Ex/Rx from the LE. I can see where someone may want to use a cat-5 cable in a wireless environment to do some trouble-shooting using the tester. However, you'll just have to remember to pull the Ex/Rx in addition to putting the "Remove for wireless" jumper in place to interact with the LE in wired mode.
Update: This is confirmed by RJ as normal operation for the LE and has been posted a number of times throughout the forums. When using the LE in wired mode, the Ex/Rx MUST be removed.
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3. When pressing the "Mode" button on the LE with a high starting channel value while DMX data is flowing (either wired or wirelessly), the LE will lock up. Sometimes light output will continue, sometimes not. In all cases, the LE will not respond to the "Mode" button any more. This requires the power to be cycled on the LE to clear the lockup.
Explanation: I'm guessing this is some kind of DMX frame timing issue on the LE when a high starting address is set. I can re-create this using the dongle with Vixen as well. The problem only shows when using high start addresses (anywhere from about 380 and up). So this appears to be an LE issue only.
Solution: Regardless of your DMX data source, disconnect or pause the DMX data stream when using the "Mode" button where the LE has a high start address, or if you're setting it to a high start address.
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I will pass on any LE related issues we find to RJ. I can't speak for him, but I'm guessing these things won't be on any high-priority list since they're very obscure problems. If they were causing issues for everyone, they'd have been fixed a long time ago.
Testers, keep up the good work! I'm impressed that people are finding such things. That tells me you're working hard to find flaws. Excellent!