Wood and Douglas 1335, Operating Instructions Manual

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1892 1335 - Orion Radio Modem Operating Instructions - v2.9 / Aug 2009
TELEMETRY CONFIGURATION
There are three basic telemetry modes, MI, ME and ML, with variations as explained on
pages 10 to 13. This section looks at the parameters which are common to several modes,
and the parameters which are mode-dependent.
Common Parameters (MI and ME)
Analogue input scaling (four inputs,
individually set)
(ATS300 n )
0-2.5V, 0-5V, 0-10V, 0-20mA*
Digital input
Low = closing contact or 0V
High = open circuit or 3.3V to 12V No configuration required
Digital input type (four inputs, individually
set)
(ATS312 n )
Logic input or pulse counter
Analogue output scaling (four outputs,
individually set)
(ATS305 n )
0-2.5V, 0-5V, 0-10V, 0-20mA*
Digital outputs
High = open circuit
Low = open drain closure to 0V No configuration required
Copy RSSI to an analogue output (ATI2) 0 (none) or number of output 1-4
Make one input PTT (transmit carrier
continuously when held at 0V)
(ATS316 )
0 (none) or number of input 1-4
v n as the last digit of an AT command indicates the input or output number .
*Note: 0-20mA ports will typically be used in the range 4-20mA to interface with standard
current loop equipment.
See page 16 for information about configuring Alarms and Alerts.
Mode I Parameters
Spontaneous
Trigger Levels
(ATS312 n )
If Mode I is used to transmit changes spontaneously, then to prevent
nuisance levels of traffic, the minimum change which will trigger a
report must be specified.
A digital input must change and remain for a dwell time. The dwell
time is the same as for alarms, and is part of the input configuration.
An analogue input must change by more than a specified amount
(the dead band) and stay outside it for a dwell time. This parameter
is set independently of any others.
Trigger Level parameters are set for each input individually.