home > scada radio telemetry systems > ruggedized wise 4-20 radio

Lower Cost DIN Rail 4-20mA Wireless I/O Radio - click here

Page 1 of 2
View Specs

Ruggedized WISE 4-20 Spread Spectrum Modbus Radio Modem with 4-20 mA Current Loop, Serial, Discrete, Pulse Counter and Modbus I/O

WISE 4-20 available at 50 MHz, 900 MHz and 2.4 GHz or VHF and UHF licensed frequency bands with up to 8 4-20 ma analogs (16 bit), 8 discretes, 1 pulse counter (for flowmeter applications) or 1 serial interface. WISE Host unit has identical I/O and is also available with a serial port, allowing remote site monitoring and control using Modbus.

WISE 4-20 is a comprehensive line of industrial grade, frequency hopping spread spectrum and remote radio telemetry modems with unified I/O features for industrial applications. Link a single sensor to your data acquisition network or use WISE 4-20 to build SCADA systems, long range links and regional wireless data acquisition and remote control networks.

  • High Speed - 220 Kbps @ 2.4 GHz - frequency hopping spread spectrum
  • High I/O Count - up to 8 4-20 mA analogs (16 bit / 24 bit internal), 8 discretes and 1 pulse counter interface, or 1 serial per remote unit
  • Industrial Grade - -40°C to +70°C, IP 65 water tight enclosure & connectors - surge, short circuit and RF filtering on all I/O
  • Five Radio Types - 50 MHz (FSK) or 900 MHz & 2.4 GHz (frequency hopping spread spectrum) and VHF or UHF (licensed) options
  • Flexible Networking - Modbus, serial, repeater versions - 1 Host services up to 253 remotes
  • High data security - license free, field-proven
    Frequency Hopping Spread Spectrum (FHSS) with 256AES encryption (900 MHz 1 watt version)
  • Long Range - up to 40 miles with 20 dB fade margin (900 MHz 1 watt radio or 5 watt licensed radio)
  • Low DC Power

available with Explosion Proof enclosures (not shown)

Lower Cost DIN Rail Mount Version - click here

Use Spread Spectrum or Telemetry Radio WISE for:
4-20mA loops - 16 bit precision (24 bit internal)
Contact closures
Flowmeter pulse counter
Serial RS232 links up to 220 kb/s
Serial RS485 links up to 220 kb/s
Local/regional Modbus networks

The WISE system is designed to reliably and securely replace cable in industrial applications. Each WISE remote accepts up to eight 4-20 mA analogs, eight discretes, 1 pulse counting or one RS232/485 input. All I/O is replicated at the WISE host - including analogs with full 16 bit precision. The link between remote and host is a secure, error-protected digital radio operating at 50 MHz, 900 MHz or 2.4 GHz, or a licensed 150 MHz or 450 MHz radio, at VHF or UHF.

WISE radios are shipped factory-configured and tested. There is no field configuration necessary. Typical installation involves simply mounting and powering the units and connecting the antennas and I/O.

Self Test /Verification
A convenient 'Test' button is provided on both remote and host units to allow verification of the radio.

Latest Frequency Hopping Spread Spectrum Technology
Both the 900 MHz and 2.4 GHz systems utilize frequency hopping spread spectrum with advanced protocols that greatly increase the communications reliability in high noise and interference environments.

Inside the WISE Remote
The WISE remote is located nearest the sensor(s) and includes 4-20 mA, discrete or digital serial interfaces, as well as the complete radio, antenna, optional battery and solar power sub-systems.  An optional sensor power supply sources 5 - 48 VDC. All is self-contained in the IP 65 cast aluminum enclosure, with three indicator LED's, two water-tight I/O connectors and a Test button - used to verify overall WISE system operation. There is absolutely nothing to calibrate or configure.

WISE Networking
Our engineers have created WISE I/O options that support a broad range of legacy industrial interfaces and protocols including Modbus. This flexibility allows very extensive data acquisition links and networks to be created from our product offerings.

For example, you can connect a WISE Host directly to RS-232, creating a wireless node capable of polling a large number of WISE remotes using Modbus protocol. The system can be constructed seamlessly using different WISE radio types, combining long range links with short range (area) coverage. Each WISE remote acquires analogs and discretes from the field, and can also be commanded to output analogs and relay closures. Essentially, each remote performs the role of a flawlessly integrated radio + PLC - without the associated cost.

WISE Repeaters are used whenever either distance or major obstructions cause the radio signals to be weak. We offer several versions, including one for each radio type, plus a high-speed repeater that uses the NEMA 2.4 GHz radios shown in the photo. Data is processed through all Repeaters in digital form so sensor reading accuracy is never affected.


Weather Tight 2.4 GHz Radio Mounts at Antenna
Long runs of coaxial cable at 2.4 GHz are expensive and lossy. The WISE NEMA 2.4 GHz radio module allows you to place the radio right at the antenna.



Signals and power are fed to the radio with an inexpensive Category 5 cable run, up to 150' long, terminated in a standard RJ-45 connector. On the ground, the connector mates with the standard WISE 'Black-Cube' which can be conveniently located near the sensor (4-20, etc.) interfaces. As with all WISE products, everything comes factory-configured and tested - no field configuration is required. -40°C to + 70°C operation - NEMA 4X rated.

Transmission Range Note:
Synetcom specifies a 40 mile (900 MHz 1 watt or VHF licensed 5 watt) range that includes a 20 dB margin (if the signal fades as much as 20 dB - a factor of 1/100 - the link continues to operate).

Obstructions in the line of sight path reduces range, depending on the type of obstruction.  Contact our factory for assistance.

Radio Choices:                       o For short range (<1000') indoor or outdoor applications, the low power 900 MHz system is recommended - lowest cost and robust over shorter distances, even with obstructions.

o For moderate range (1000' - 5 miles), choose the 900 MHz 1 watt radio for most applications, especially those that don't have line of sight.

o For longest range (5 - 40 miles), choose the 1 watt 900 MHz radio or 5 watt VHF/UHF radios.

o If the link must be secure or if long range is needed at 900 MHz, choose the 256 bit AES encrypted 1 watt 900 MHz radio (40 miles).

High Accuracy Analog Readings
The WISE Remote captures analog sensor readings with self-calibrating 24-bit sigma delta A/D technology. Sigma delta incorporates high sample rates and decimating digital filters to achieve excellent precision, accuracy and stability over temperature and time. The A/D features high frequency noise and hum suppression approaching 100 dB.

Lower Cost 4-20 mA DIN Rail Mount Version - click here

(310) 379-2000
23879 Madison Street
Torrance, CA 90505

home  services  customers  white papers  contact us