8-12 Qualitek mR Owner’s Guide
8.6 Standard I/O Operation
Operation of the standard I/O is as follows:
The inputs are opto-isolators requiring 24VDC power with respect to pin 19
(INRTN). The outputs are dry contact relays. If desired, it is possible to supply
24VDC to the (-) side of each of the outputs, and then when the output is asserted,
there would be a 24VDC signal present on the (+) side.
See "I/O Port Pinout" on page 8-13.
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