Multiple U12 connections
Posted 28 May 2013 - 06:09 PM
Posted 29 May 2013 - 03:32 PM
Posted 30 May 2013 - 12:22 AM
USB is specified for 127 devices per host, so using 50 U12s is possible. The most we have tested with on a single host is about a dozen, and we had no problems. USB is a serial bus, so you would talk to them sequentially.
Also consider the U3 rather than the U12.
Another possibility is using a smaller number of LabJacks to control a bunch of I/O expander chips such as the MCP23S17.
What type of relays are they? 5V control and 24V output? Solid-state or mechanical?
Realys are mechanical having a coil excitation of 24V Dc. I choose U12 since the digital output high level is 5V, since i will be using
an opto isolator which works on 5V and switches the 24VD.C to the relay.
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