Microtel Series 250 - Manual (Page 11)

G. FAULT MONITORING INTERFACE CONNECTIONS
The dialer system is designed to accept up to four channels of dry (unpowered),
normally open or normally closed signal lines. The system provides a small, pulsed
sampling current to determine if the contact is open or closed. Leads from normally
open or normally closed switches may be routed through the conduit port at the lower
right side of the system. Connect each wire pair to its appropriate channel input
terminal pair on the Fault Input Terminal Strip. Shielded, twisted pair, 20 or 22 gauge
wire is recommended. Ground the shield at the sensor and leave the shield floating
(Disconnected) at the alarm dialer system.
Each channel may be configured to be either normally open or normally closed. A
channel will be normally open if the “no fault” (Green) condition consists of an open
circuit on that channel’s wire pair. A channel is normally closed if the “no fault” (Green)
condition consists of a closed circuit on that channel’s wire pair.
The programming section of this manual will provide details on how to program the
Mode (normally open or normally closed) of each channel as well as setting the Fault
Delay time for each channel.
Any unused channel should be left unconnected and programmed to a normally open
mode (Green)
.
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