Operating instructions

1892 1335 - Orion Radio Modem Operating Instructions - v2.9 / Aug 2009 49
Analogue In/Out Configuration
v These tabs apply to Modes I and E only.
Figure 17 - Mode E Analogue Config tab on lower set
Figure 18 - Mode I Analogue Config tab on lower set
The Analogue Configuration tab sets the configuration of the four analogue input ports (ADC)
and output ports (DAC).
Range: The analogue input and output ports can be configured for 0-20mA, 0-2.5V, 0-5V or
0-10V, selected in an individual dropdown box for each port.
Mimic dead band and dwell time: These parameters are only present in I-mode
(Spontaneous) operation, when they are valid for both Base and Outstation. In order for a
spontaneous report to be generated, the level must exceed the previous reading transmitted
by more than the dead band (plus or minus), and must remain outside the dead band for at
least the dwell time. Dead band is in ADC bits 1-255, and dwell time in tens of milliseconds.
DAC value: This specifies the output voltage or current of the analogue output ports in volts or
milliamps, according to the range chosen.
Failsafe: If loss of radio contact or low/high supply alarm is detected, a failsafe value can be
selected for the analogue output ports, if Failsafe On is ticked for the port and the Failsafe
master switch is enabled (see p.48). Units are volts or milliamps, as for DAC value.
RSSI output: The radio RSSI value can be selected to be output at one of the analogue
output ports.