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Answer Posted / carl_ellis
24Vdc is the DC power supply voltage.
For 2 wire loop powered instruments, the DC power supply is
in series in the loop.
For 3 wire instruments, the DC power supply common (-)
shares a terminal with the receiver's common (-),
but has a separate (+) terminal.
For 4 wire instruments, there separate wiring terminals for
both the power supply (+) and (-).
Carl Ellis
Measure First
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