Interface connections | 215
E&M Signalling types
The Q4EM E&M signalling leads are optically isolated, bi-directional lines which can be externally
referenced to meet any of the EIA-464 connection types I, II,IV or V (as shown below).
The M1 lead associated with the M wire detector can be externally referenced to earth or battery as
required.
The E1 lead associated with the E wire output can be externally referenced to earth or battery as
required.
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