GalileoSky GLONASS User Manual
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GalileoSky GLONASS/GPS v5.1 (223) User’s ManualGalileoSky Ltd Page 137. Terminal units performance7.1 Discrete-analog inputs (DAI)To attach external sensors the terminal has 8 discrete-analog inputs which are pulse-frequency at the sametime. Each input’s function is set in the Terminal settings (sections Discrete-analog inputs setting andInputs/outputs). In section Contacts description inputs are designated as IN0, IN1, IN2, IN3, IN4, IN5, IN6,IN7.Each input saves its values to the nonvolatile memory, i.e. in case if the channel is set to be a pulse one, thepulse number value will be restored after resetting the device.Feature ValueMaximum measured voltage 33 VAnalog inputs resolution 33 mVMaximum transmitted signal frequency 4 kHz (synchronous measuring at 1 input)3.5 kHz (synchronous measuring at 2 inputs)1.5 kHz (measuring at 4 inputs)DAI have the following settings:Parameter ExplanationFilter type (inputfunction)0 - arithmetical average (discrete input state is also generated);1 - pulse count;2 - frequency input;3 - pulse count from two synchronously connected sensors.Filter length tocalculate the meanvalueThe greater this parameter, the more slowly the device responds to the input signalchange. With filter length equal to 1 - averaging does not happen.Set this parameter to 1 for frequency inputs.It is necessary to set this parameter to 1 for pulse inputs. If the Terminal countsextra pulses, the filter length should be increased by one and accuracy estimated.Ranges forresponse/nonresponse areas(logical 1 and 0)To process discrete signals, discrete signal response/nonresponse range should beset where signals equal to one and zero. Discrete inputs states should be seen inthe Status Of Inputs field, but not in the Input voltage fields (Table 2. GalileoSkyprotocol tags).While counting pulses or frequency, it is necessary to put the value equal to halfthe pulse value into all the fields of the given group (example: the pulses' amplitudeis 5000 mV, so all the fields must take the value 2500 mV)While counting pulses from 2 synchronously connected sensors, response zonelimits must be the same and equal to half of pulse value at response of one of thesensors. Non-response zone limits are equal to half of pulse value at two sensorssimultaneous response. |
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