SRTU-121 wireless p2p
This product has been discontinued. This web page is provided so current customers using the product can have a quick reference for specifications. Please contact Automation Electronics for current products that may meet your needs.
When you need to transfer a handful of digitals or a couple of analogs from one location to another, our wireless point to point controllers are ideal. Automation and Electronics SRTU-121 is designed to transfer control and monitoring signals from one point to another. It is a complete, off-the-shelf package, designed to operate with either 2.4 GHz or 902-928 MHz spread spectrum radios. Analog and digital signals can be transmitted up to 20 miles point-to-point without a license.
The SRTU-121 is designed with our "Simple RTU" board. The SRTU-121 transmits analog and digital data in both directions. In the event of a communication failure, it provides a communication failure output at each end of the loop. The SRTU-121 is expandable up to 16 digital inputs, 16 digital outputs, 4 analog inputs, and 4 analog outputs.
Features
The basic unit transmits to its companion unit:
- Six digital inputs and
- Two 4-20 mA analog inputs
receiving in return:
- Four digital outputs,
- Two high current relay outputs, and
- Two 4-20 mA isolated analog outputs
General
- Low cost
- Low power
- Expandable
- 12 bit A/D and D/A converters
- 12 A relay outputs
- Industrial temperature rating
- Non licensed spread spectrum radio
- MODBUS protocol
Applications
- Wire line replacement
- Water well monitoring/control
- Lift station monitoring/control
- Pressure reducing valve control
- Point to multi-point SCADA systems
- Pump control systems
- Irrigation monitoring/control
- Wireless 4-20 mA loops
- Waste water plants
Options
- RPM: 110 VAC / 12 VDC battery backed power supply
- DC24: 12 VDC /24 VDC @ 200 mA converter for 24 VDC analog loop supply
- SRAO-2: Two 12-bit isolated analog out
- EXP-164: 16 digital inputs, 16 digital outputs, 4 analog inputs, 4 analog outputs expansion module
- DIF-16: 16 digital input field terminal board
- PRO-8: 8 relay output board
- SP1210: 12 V @ 10 AH per day solar supply with 5 days backup
- SROAM 1200 bps, RS-232 radio modem for use with licensed analog radios
- Radios: Spread spectrum 902-928 MHz 1 watt; range up to 20 miles with high gain antennas; UHF/VHF data radios quoted by application.
- Antennas: Contact factory for available options.
Specifications
| Mechanical | |
|---|---|
| Enclosure: | 12" x 10" x 6" NEMA 4X, 13.3" x 11.29" x 5.58" actual |
| Environmental | |
| Operating temperature: | -40 to +140 deg. F (-40 to +60 deg. C) |
| Power requirements | |
| Typical: | 30 VA @ 110 VAC, less than 5 W at 12 VDC |
| Input/Output | |
| Digital Inputs: | Six optically isolated (12 VDC @ 10 mA) |
| Digital Outputs: | Four optically isolated 100 mA driver outputs |
| Relay Outputs: | Two 12 A resistive @ 120 VAC form A |
| Analog Inputs: | Two 12-bit 4-20 mA |
| Analog Outputs: | Two 12-bit (isolated 4-20 mA) optional |
| Expansion I/O: | 16 digital inputs, 16 digital relay outputs, 4 12-bit 4-20 mA A/Ds, 4 12-bit (isolated 4-20 mA) D/As |
| Communications | |
| Ports: | One RS-232/RS-485 port for communication |
| One RS-232 port for configuration | |
| Protocol: | MODBUS RTU |
| Radio | |
| Type: | Spread spectrum 2.4 GHz frequency hopping 10 to 600 mW standard |
| Range: | Up to 1.5 miles with 4 dBi Omni; up to 10 miles with high gain antennas |
