Operating instructions

Alarm Parameters Raise conditions Clear conditions
1892 1335 - Orion Radio Modem Operating Instructions - v2.9 / Aug 2009 17
Comms Poll period time
(0=off) (ATS183)
and tolerable
number n of
missing
messages
(ATS184)
Ack is not received to n
polls (Base) or poll is not
received within poll time
+ 3s for n consecutive
periods (Outstation)
Next poll is received
Number of
message
attempts (alarm,
spontaneous or
poll) (ATS185)
Acknowledgement is not
received to the set
number of consecutive
attempts to send a
message to unit n.
A message is received
from unit n.
Power
(ATS172)
High level (0=off)
High dwell time
Low level (0=off)
Low dwell time
External supply voltage
exceeds either limit for
applicable dwell time.
External supply comes
back within limits for
applicable dwell time.
The Alert output can be set to respond to telemetry alarms, housekeeping alarms or both, or
switched off entirely (ATS337). The time for which it latches on can be set from 0 to just over
10 minutes in 10ms increments (AT336). Alert output and permission to transmit an alarm
message are independently controlled.
Failsafe Feature
In the event of a housekeeping alarm (Comms Alarm or Low/High Supply Alarm), telemetry
outputs can be made to take on failsafe values until normal operation is resumed. The failsafe
values may be individually programmed, and failsafe behaviour turned on and off using a
master setting.
Master Failsafe
control (ATS188)
Enables or disables Failsafe behaviour for the whole unit.
Digital outputs
(ATS318n where
n is input number
1-4)
Each digital output can be programmed with:
Failsafe/no failsafe
Failsafe behaviour:
Stay as you are (default)
Go low
Go high
Analogue outputs
(ATS305n where
n is input number
1-4)
Each analogue output can be programmed with:
Failsafe/no failsafe
Failsafe behaviour:
Stay as you are (default)
Go to the specified level 1-1023