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Extensive customer feedback has made us upgrade our bestseller A755 addSDI into Version 2. Now featuring 2 pulse inputs instead of one and two digital I/Os that allow status checks on equipment and even equipment control!
Here are a few examples:
Soil moisture monitoring:
Depending on the power consumption of your SDI-12 soil moisture sensor you can connect one, two, three or even four SDI-12 soil moisture sensors AND a water meter AND an irrigation gauge to check the proper flow and distribution of water. To see if your pump is ON or OFF A755 v2 also has 2 digital I/O ports for status signals and switching operations.
Most multi-parameter water quality probes available today rely on SDI-12 as their interface of choice. Many such probes even come with their own internal battery pack, so power consumption is not an issue. For some probes we recommend the use of our A917 Power Booster interface to get to the required levels of supply voltage.
Radar sensors are increasingly popular with civil protection agencies as they can easily be mounted on existing structures like bridges, thus reducing the cost of installation. One of the best selling products in this regard is the RLS radar sensor from OTT Germany, for which we have developed a little power booster interface to provide sufficient voltage from the RTUs internal battery. To improve on prediction quality you can also connect one or two rain gauges to the RTU.
Read the full article on the A755 addSDI GPRS RTU Version 2!
|Case||Aluminum, powder coated|
|160 x 60 x 80 mm (6.3 x 2.4 x 3.1 inch)
1200g (2.5 lb)
|Connectors for sensors and power||Made in Germany by Binder
IP-67 protection class
Sockets: brass, nickel plated, with gold plated socket contacts
2 x M9 female 7-pin
1 x M9 female 5-pin
|Antenna connector||TNC with external seal, water tight , Made in Germany|
|Mounting||Mast mounting bracket|
|Operating temperature||-20°C ... +65°C
Extended range: -30°C ... +75°C upon request
|Input Channels||44 total|
|Digital||40 x SDI-12 values|
|Counter Inputs||2 x for standard reed switches; electronical signal debouncing, e.g. for rain gauges; max. 30 pulses per second;
1 of the two counter inputs supports rain intensity measurement
|Digital I/Os||1 x 3V TTL
1 x 5V TTL
Both channels can be configured to work either as inputs or outputs.
|Sensor Power Supply||unregulated battery voltage 5.6V ... 7.5V|
|Memory||2MB for up to 500.000 readings (depending on types of sensors attached)|
|Frequency range||900 & 1800 MHz (Europe) and
850 & 1900 MHz (Americas)
Optional: UMTS frequencies
Optional: H24 7-band GPRS/3G modem
|SIM Card||small footprint|
|Security||SIM cards are PIN-code protected!|
|Connection types||GSM: CSD Circuit Switched Data
|GPRS Connect Frequency||User selectable:
- permanent connection
- connect from 1 x per minute to 1 x per day
|Antenna||Omni directional, quad band, 2dBi, with TNC connector|
|Power Supply||internal 6.2V battery, charged by solar panel or mains adaptor|
|Battery type||Panasonic High-Temperature Industrial Grade NiMH battery, 3100mAh|
|Approvals||FCC Part 15, R&TTE, CE, Industry Canada, ACMA Australia|