Instruction manual

Glossary
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Exception Report
Channel
The communications method used by a device for
exception reports to a Controller. The choices are Radio,
Phone, and Direct Serial.
Exception reporting
The ability of an RTU or Controller to report changes in
I/O status to the master without being polled.
Form C relay
Relay with both normally open and normally closed
contacts.
Group Call Address
An additional address assigned to an RTU (besides its own
device address) to which the RTU responds. All RTUs with
the same Group Call Address respond to messages with this
address.
High Threshold
A value used with analog inputs or outputs to determine
when to report an exception or log data.
Holding register
MODBUS term for transferring special data, such as analog
outputs or accumulators.
Hysteresis
For analog inputs, outputs, and accumulators, a method of
preventing multiple exception reports or data log entries as
the signal crosses the threshold value. The value represents
fluctuations above or below the threshold that will not
cause an exception report or data logging.
Inbound Address Offset
Parameter used for store and forward radio
communications.
Inbound Address Range
High
Parameter used for store and forward radio
communications.
Inbound Address Range
Low
Parameter used for store and forward radio
communications.
Initial Retry Interval
The time interval to wait before attempting to establish
communications through the Exception Report Channel
after the first failure.
Input register
MODBUS term for transferring analog input data.
Inter-Packet Delay
The minimum delay between the time the radio is keyed
down at the end of a transmission and the beginning of a
key up sequence for the next transmission.