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Supply Voltage and Communications Issues

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I am using a V120-22-T2C.

It is communicating on Comm2 by way of RS485 to a single slave.

The distance is very short (less than a foot) and terminating resistors are enabled on both ends.

It has been working fine (flawlessly) on 24vdc. I had to switch to 12Vdc power, and now the comms will not work.

Even if I put it back on the same power supply, an go off the 12VDC taps instead of the 24VDC taps, it will not communicate. It only works properly on 24VDC.

Why will the RS485 not function properly on 12VDC?

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