Page 46 May 2014 – TD 293 OPERATING MANUAL – SmartGuard 5100/5120/5300/5320
6.4
Digital sensors
Open
Digital Sensors
in the
Device
Layout
.
Press
Add
below the list of sensors, refer
Figure 6-12, and enter sensor
information.
Digital signals are connected through the
Digital 1 and Digital 2 connectors on the
Basic and Extended parts of SmartGuard
respectively. Refer Appendix 1 for
connector pin out details.
•
Digital 1 is non-insulated. It reads 0 when input voltage is < 1V and 1 when > 3V and has an input
frequency range of 1 to 5000 Hz, ±1.5Hz or 0.1% whichever is larger.
•
Digital 2 is opto-insulated. It reads 0 when input voltage is < 0.5V and 1 when > 3V and has an input
frequency range of 1 to 500 Hz, ±1.5Hz or 0.1% whichever is larger.
Each digital channel has the capability to be:
•
Digital Logical
input
•
Pulse Rain Fall
sensor which is a tipping bucket counter input
•
Frequency
input in the range as valid for the selected channel
The frequency input can be scaled and linearized using a 3
rd
order polynomial in the User Maintenance
section below. Coefficients are provided by the sensor manufacturer or equal calibration. The raw value is in
Hz, pulses pr second.
The Logical parameters are:
•
Level which is 1 (true) for high level input signal
•
Low Edge which is 1 (true) when the last transition detected is from low to high (0V to 10V)
•
High Edge which is 1 (true) when the last transition detected is from high to low (10V to 0V)
The Pulse Rainfall input is scaled by typing the factor in User Maintenance. The scaling factor is provided by
the sensor manufacturer or equal calibration. The raw value is pulse count accumulated over a user
selectable interval of either 10 minutes, 1 hour, or 24 hours. The accumulated value is zeroed at start of
each interval. For the 24 hours interval the default time reset value is 06:00 (AM) but may be changed by the
user.
Figure 6-12 Digital Sensors.
