Operating instructions

50 1892 1335 - Orion Radio Modem Operating Instructions - v2.9 / Aug 2009
Analogue Alarms
Figure 19 - Analogue Alarms tab on lower set
Each input can transmit an alarm message back to the Base if certain conditions are met or
exceeded. To generate an alarm, the level must go above or below (depending on the
Trigger setting) the level entered into the Trip Level box for at least the time entered into the
Dwell Time box. Dwell time is in units of 10ms, so for example one minute is represented by
100. Conversely, to clear the alarm and transmit a message back to Base, the level must go
back into the normal zone for at least the Dwell Time.
Digital Configuration
Figure 20 - Digital Config tab on lower set
Digital In Usage checkboxes select normal digital or pulse count inputs for Mode E. Pulse
counting is not available in Mode I because there is no way to output or reset it, and this
feature is greyed. Note that, even if alarms are not used, pulse polarity and minimum duration
need to be set up on the Digital Alarms tab.
Digital In PTT (Test) allows any one of the digital inputs to act as PTT - that is, carrier is
transmitted for as long as the input is held to 0V. This is intended for purposes such as lining
up antennas. Only one checkbox can be selected at one time. Requires Level 2 password.
Digital Out Port State determines whether the output is high (open circuit) or low (connected
to 0V) at power-up.
Digital Out Failsafe sets the behaviour in a Failsafe situation (a comms or power supply
failure). The output will go high or low, as selected by the checkboxes, if Failsafe On is ticked
for the port and the Failsafe master switch is enabled (see p.48).