Instruction manual
025-9209 7
OPERATION
GENERAL OPERATION
The Model 1708 and Model 1716 Remote Terminal Units (RTUs) perform two basic tasks:
1. RTUs report changes in input/output to the Controller
2. RTUs respond to commands from the Controller.
Analog and digital inputs may be configured to report changes as they occur without being
polled by the Controller (report by exception). When the RTU recognizes an alarm condition,
it will check to see if the radio channel is busy. If the channel is busy, the RTU will wait for
the channel to clear. If the channel is not busy, the RTU will transmit its data and wait for a
reply from the Controller indicating that the alarm was received. If the RTU has not received
a reply within 15 seconds, it will re-send the packet and wait for a reply. In all cases, the
RTU will continue attempting to complete the transmission sequence until it receives the
correct response.
Each RTU can be configured differently so that the user can customize operation to match
the requirements of the application.