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IO Channels Relay Board

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2 replies to this topic

#1 Dane

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Posted 19 June 2015 - 04:47 AM

I'm attempting to use the UE3 to trigger a SainSmart 16 channel
12 volt relay board through the CB15. The current draw is too
much to use the PS12DC.

The relays can be triggered when pulling the FIO4-7 channels low

but does not respond to the channels (EIO0-7 CIO0-3) on the CB15

attached to the same UE3.  Is there a difference between the U3 FIOs

and the I/Os present on the CB15?


#2 LabJack Support

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Posted 19 June 2015 - 08:45 AM

Yes there is a difference, but actually the difference is that the EIO/CIO have less source resistance (~180 ohms) than the FIO (~550 ohms) and thus can sink/source more current:








#3 Dane

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Posted 20 June 2015 - 12:21 AM

That's interesting. You'd think the extra current capacity would be

more likely to trigger the relay.



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