Western Telematic PLS-345 - Manual (Page 45)

9. Application Examples
9.1. Monitoring Signal Drop
and/or Power Loss
In this application, the PLS-345 will monitor the DTR signal
from a data device. If the signal drops or the data device loses
power for more than one minute, the unit will automatically
switch circuits 2 and 3 to the "B" line.
1. Connect Line from Data Device: Connect a line from the
Data Device to the Monitor Input Connector as shown in
Figure 9.1.
2. Set Monitor Selector Switch: Locate the Monitor
Selector Switch on the PLS back panel. Slide the switch to
the "RS232" position.
9-1
Figure 9.1: Monitoring Signal Drop