A755 addSDI GPRS V2
A755 addSDI GPRS V2
The A755 addSDI GPRS RTU in its version 2 was developed to provide users of SDI-12 sensors with an inexpensive means to log and transmit up to 40 SDI-12 values of environmental data, while at the same time providing 2 pulse inputs, e.g. for water meters and rain gauges, and 2 digital TTL ports which are custom configurable either as in- or as outputs.
- Remote Transmission Unit
- IP-67 ;Ultra low power design ;Cost effective solution in case of using digital sensors (SDI-12 / Modbus), digital I/O's and counters ;Large integrated memory (2MB equals 6 months of data for usual 15 minute interval values)
- GPRS, 3G
- 2 pulse counter (2x 30Hz counters): 2 digital I/O (expandable with A553 up to 14 digital I/O's): 40 SDI-12 values: Modbus support via adapter
Should the GSM network go down or the GPRS connection be interrupted no data will be lost as the A755 features plenty of internal memory. Example: 15-minute data from a multi-parameter water quality sonde with 8 parameters will be stored for about 4 months. All functions can be remotely configured through the A850 Gateway. A quad-band GSM/GPRS modem from Telit (formerly Motorola) and a powerful NiMH battery are built-in. The rugged aluminum case has stainless IP-67 connectors and an integrated mast mounting bracket.
Power is supplied by means of a solar panel or an external power supply.
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| Mechanics: | |
| Case | Aluminum, powder coated |
| Protection class | IP-67 |
| Dimensions and weight | 160 x 60 x 80 mm / 6.3 x 2.4 x 3.1 inches 1150g / 2.4lb. |
| Connectors for sensors and power | 2 x M9 female 7-pin to sensor 1 x M9 female 5-pin to power Made in Germany by Binder IP-67 protection class Sockets: brass, nickel plated, with gold plated socket contacts Protective cap |
| Antenna connector | TNC with external seal, water tight , Made in Germany |
| Mounting | Mast mounting bracket integrated |
| Operating temperature | -20°C ... +65°C / -4°F ... 149°F -30°C ... +75°C / -22°F ... 167°F extended temp. range upon request |
| Logger: | |
| SDI-12 | Up to 40 values can be addressed |
| Modbus | optional; via internal interface board |
| Counter Inputs | 2 for standard reed contacts; electronically debounced, e.g. for rain gauges; max frequency up to 50 pulses per second; min. pulse length 10ms, min. break time 10ms |
| Digital I/O ports | 1 x 3V TTL and 1 x 5V TTL Both I/Os configurable as either inputs or outputs |
| Data Memory | 2MB for up to 500.000 readings; 4MB: optional - up to 1 Mio readings; this is not a retrofit, but needs to be installed ex factory |
| Data transmission: | |
| Frequencies | 900 & 1800 MHz (Europe) and 850 & 1900 MHz (Americas) |
| Modem | Telit G24 Telit H24 upon request |
| SIM-Cards | small footprint |
| Security | SIM-Cards are PIN-Code protected |
| Connection types | - GSM: CSD Circuit Switched Data - GPRS - UMTS: optional |
| GPRS Connection Frequency | User selectable: - permanent connection - connect from 1 x per minute to 1 x per day |
| Antenna | Omnidirectional, +2dBi, TNC, waterproof |
| General: | |
| Power supply | internal 6.2V battery, charged by solar panel or mains adaptor; optional: non-rechargeable Lithium-Thionyl battery (to operate the RTU w/o solar panel) |
| Battery | Panasonic high-temperature industrial grade NiMH battery, 3.300mAh |
| Type approvals | FCC, R&TTE, CE, Industry Canada, ACMA Australia |