H-424MS Spread Spectrum SDI-12 Radio Bridge
The WaterLOG® H-424MS is a spread spectrum SDI-12 radio bridge. Each unit contains a microprocessor control board and a spread spectrum telemetry radio. Spread spectrum technology is highly secure and has good interference immunity. The radio operates in the license-free 900 MHz ISM Band eliminating the need for any FCC licensing.
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The radio link is easy to use and works with any SDI-12 data recorder or sensor
- Radio link provides transparent, SDI-12 compliant communication between your data recorder and one or more remote sites
- All SDI-12 commands are supported, including manufacturer specific extended commands
- Each remote site can have multiple SDI-12 sensors
- The system uses modern direct sequence spread spectrum telemetry radios
| DATA INPUT | |||
| Protocol | Master |
SDI-12 |
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| Slave | SDI-12 | ||
| Type | Transparent SDI-12. Works with all SDI-12 commands including extended and V1.2 Commands | ||
| Requirements | Data logger must support mulitple (3/3) SDI-12 breaks with retries. | ||
| Radio | Frequency Range | 902.5 to 927.5 MHZ | |
| Line of Site | 5 plus miles - depending on antenna and site conditions. | ||
| RF Connector | Reverse Type - TNC | ||
| Transmission Power | 500 mW (=27dBm) | ||
| Receive Sensitivity | -100 dBm | ||
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| DATA OUTPUT | |||
| SDI-Output | Baud Rate | 1200 | |
| Protocal | SDI-12, 7-bit even parity, 1 stop bit | ||
| Output Voltage Levels | Minimum high level | 3.5 Volts | |
| Maximum low level | 0.8 Volts | ||
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| MECHANICAL INPUT | |||
| Physical | Enclosure | Fiberglass, NEMA 4 | |
| Size | 8 in. x 6 in. with hinged screw cover | ||
| Connectors | H-424 | Switchcraft EN3P4M (4-pin female) | |
| Mate | Switchcraft EN3C4F (4-pin female) | ||
| Power | Input Voltage (ASI only) | 9.6 to 18.0 Volts DC | |
| Power Control | Remote station uses programmable sleep/wake up to detect carrier. | ||
| Current | Standby | 510a (sleep) | |
| Receive | 135 mA | ||
| Transmit | 800 mA | ||
| Average with Power Control | Less than 2.0 mA | ||
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| ENVIRONMENT | |||
| Temperature | Operating | -40 to + 60 C | |
| Storage | -50 to +70 C | ||
| Humidity | 0 to 100% | ||
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| MISCELLANEOUS | |||
| Warranty | The WaterLOG® H-424MS is warranted against defects in materials and workmanship for two years from date of shipment. | ||
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| Specifications subject to change without prior notice due to ongoing commitment to product testing and improvement. LR February 25, 2011 D11 0211. | |||