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A755 V2

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!

Applications for A755 V2

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.

Water quality monitoring:

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.

Water level monitoring - flood warning

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!

Technical Specifications

Technical Specifications - Mechanics

Case Aluminum, powder coated
Protection type IP-67
& weight
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
Protective caps
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


Technical Specifications - Logger

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)


Technical Specifications - Data Transmission

Frequency range 900 & 1800 MHz (Europe) and
850 & 1900 MHz (Americas)
Optional: UMTS frequencies
Modem Motorola G24L
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


Technical Specifications - General

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

Ordering Information

100.755.010 A755 GSM/GPRS SDI-12
100.755.011 A755 UMTS SDI-12
200.733.522 540mA Solar Panel, 9V, 50cm cable
with male Binder connector 5-pin
800.000.277 Internal Lithium Battery 13Ah
200.720.560 Activation Switch for use with Lithium Batteries
FaLang translation system by Faboba

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Adcon Telemetry, Inkustrasse 24, A-3400 Klosterneuburg, Austria, Europe
Tel.: +43 2243 38280-0 Fax.: +43 2243 38280-6 e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Adcon Telemetry is a business unit of Ott Hydromet GmbH in Germany.