SDS Series
19
* The analog output of the moisture
sensors are calibrated. The set-points
can be programmed at the controller.
Programming intro.
The SDS-50 controller has a two-wire output that supplies electrical power and a communica-
tion protocol to operate up to 48 DataValves™ and up to 12 DataNodes™. In addition it is
supplied with a pump start PumpNode™. The default address for this device is set at 49. The
controller can operate an auxiliary pump which is typically used for chemical or fertiliser dos-
ing. The default address for this is 50. If more pumps are in use they should be programmed
at a lower number.
TWO-WIRE DEVICES:
DataNodes™ have 12 addresses and are numbered as such (1-12) in the TWO-WIRE menu.
Three variations of DataNodes™ are used. There inputs are: N/O contact (SW), Counter
(CN), Moisture (AN). DataNodes™ can have the following functions assigned to them at the
controller:
Moisture * (AN)
Pause (SW)
Rain on/off (SW)
Stop program (SW)
Water Meter (CN)
KWH meter (CN)
Frost (SW)
After the functions have been assigned they are connected to the programming port.
The menu prompts for the TW-device number. After it is selected and entered the settings are
downloaded to it. Caution: Once disconnected from the port the setting is permanent.
Moisture sensors are programmed in the same manner.
Pause sensors, N/O contact input. When activated (closed contact) the program/s the sen-
sor is assigned to will suspend irrigation until the sensor de-activates, then resume again.
Rain on/off, N/O contact input, stops irrigation until next start time.
Stop program sensor, N/O contact will stop active program/s that have been activated by
the Start Program sensor input at the controller.
Water meters are assigned to programs, pulse resolutions supported are 1 X 1L, 1 X 10L, 1
X 100L and 1 X 1000L. Maximum pulse rate is 1 pulse every 4 seconds.
KHW resolution is 1 x 1KWH
Frost Sensor (1) & (2) two programs are available for frost. Sensor (1) will activate pro-
gram 7 and sensor (2) will activate program 8.
DataValves™ are programmed by entering its number (address) at the controller. After the
address is selected it is then connected to the programming port and downloaded.
PumpNodes have a 2.9 VDC output, they activate 24VAC pump-start relays (65mA max’)
and are optimised for Omron LY 24VAC series relays. The address number at each of the 8
programs is set at default 49 for Master pump and 50 for Auxiliary pump. In the program
menu an option is displayed for the pump address which can be selected to a different num-
ber and therefore have different pumps per program. After a number (address) is selected
the TW-Device (PumpNode) is then connected to the programming port for downloading of its
setting.
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