American Fibertek MT-88 - Manual (Page 3)

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af i
american fibertek
CONTACT CLOSURE INPUT CONNECTIONS
Contact closure input connections are made via terminal blocks attached to the right side of the unit.
Please note that the two Channel 1 inputs begin at the second terminal screw closest to the fiber
connection on each of the two nine pin terminal strips. Channels 2 through 8 connections continue
down the terminal strip. For optimum performance the copper cables carrying the contact closure signal
should be the shortest length of wire practical.
The supervised input is accomplished with a
series 1K Ohms resister and a Normally Open
contact. When the contact is closed, the receiver
contact closes. The receiver contact will open if
the input contact is open or if the Tx input is
opened or shorted. The receiver may be set to
open its contact if the Tx losses power. See the
receiver instruction manual for the DIP switch
setting.