905U-1,2,3,4 Wireless I/O

Key Features:

The ELPRO 905U Wireless Multi-I/O is designed to enable extending communications to sensors and actuators in local, remote, or difficult to reach locations.With a long range, license-free or licensed wireless transceiver, the ELPRO 905U module provides a simple to deploy solution to transfer process I/O signals reliably over long distances or within an industrial plant.

• 865–867 MHz/902–928 MHz frequency and 1W RF power
• Link I/O inputs to single or multiple I/O outputs (peer to peer)
•Reliable point–to–multi-point two-way communications combining exception reporting, self-checking and data encryption
• Multi-hop repeater function provides increased communication distance
• Multiple I/O channels for monitoring and controlling field devices with set-point, pulse count, and rate available. Additional internal I/O points provided for health monitoring
• Communication failure notification and diagnostics, including radio path measurement, communications logging, and verification of I/O values
• Built-in low voltage AC/DC/battery power options, UPS battery charger and solar regulator
•User-friendly configuration software

Product Details

Transmitter and Receiver


 865–867 MHz

902–928 MHz

915–928 MHz

Transmit power 1W

Transmission Frequency hopping spread spectrum (FHSS)

Modulation Frequency shift keying

Receiver sensitivity

–106 dBm @ 19.2 kbps

Channel spacing 50 x 250 kHz

Data rate 19.2 kbps

Range (LoS)

20 miles (32 km) @ 4W ERIP d

9.3 miles (15 km) @ 1W EIRP (other countries)

Antenna connector 1 x female SMA standard polarity

Input and Output

Digital input Voltage free/NPN, wetting current 0.5 mA

Surge protected (non-isolated)

905U-1: 4

905U-2: 4

905U-3: 0

905U-4: 4–16 inputs e

Digital output

905U-1: 4 relay contacts, AC 50V: 5 AC/DC 30V: 2A

905U-2: 1 FET output 30 Vdc/500 mA

905U-3: 8 FET output 30 Vdc/500 mA

905U-4: 4–16 FET outputs e

Analog input

Floating differential inputs, common mode voltage 27V

24 Vdc for external loops provided, digital filtering 1 second

905U-1: 2 current, 4–20 mA, 15-bit resolution, 0.1% accuracy, over range indication 2–25 mA

905U-2: 6 current, 0–20 mA, 12-bit resolution, 0.1% accuracy, over range indication 0–25 mA

Analog output Current sink to common, max loop voltage 27V, max. loop resistance 1000 Ohms

905U-1: 2 current, 4–20 mA, 15-bit resolution, 0.1% accuracy, over range indication 0.5–25 mA

905U-3: 8 current, 0–20 mA, 12-bit resolution, 0.1% accuracy, over range indication 0–20.5 mA

Pulse input

As per digital input specifications above

Max. pulse rate 1000 Hz, pulse width min. 5 ms

905U-1: 1 pulse input, terminated at DI 1

905U-2: 4 pulse inputs, terminated at DI 1–4

905U-2: first DI/PI max. 1000 Hz, pulse width min. 0.5 ms

905U-2: DI/PI 2, 3, 4 max. 100 Hz, pulse width 5 ms

905U-4: 4 pulse inputs, terminated at DI 1–4

905U-4: first digital inputs/pulse inputs max 1000 Hz, pulse width min. 0.5 ms. 2, 3, 4 DI/PIs max 100 Hz, pulse width 5 ms

Pulse output

As per FET digital outputs specifications above

FET DO/PO 30 Vdc/500 mA, max pulse rate 100 Hz

905U-1: 1 pulse output

905U-3: 4 pulse outputs, terminated at DO 1–4

905U-4: 4 pulse outputs, terminated at DO 1–4

Serial Port

RS-232 9-pin DB-9 female connector (for programming use only)

RS-485 2-pin terminal block f, serial expansion 4000′ (1.2 km)

Data rate (bps) 9600

Serial settings 7/8 data bits, no parity, 1 stop bit

Protocols and Configuration

System address Configurable system address

Protocols supported ELPRO WIBnet™ auto acknowledgement up to 4 retries, CRC error checking

User configuration E-series configuration utility

Configurable parameters

Individual I/O mappings, analog and digital debounce, update time, analog set points and sensitivities, output reset times

Security 64-bit encryption on radio and serial

LED Indication and Diagnostics

LED indication Power/OK, I/O status, OK/module OK, TX, RX.

Reported diagnostics RSSI, comms logging, I/O status

Power Supply

Nominal supply 12–24 Vac/15–30 Vdc: over-voltage/reverse power protected

Average current draw

At 12 Vdc: 85 mA

+10 mA per active digital input

+25 mA per active digital output

2 x per analog I/O loop (mA)

Transmit current draw 350 mA @13.8 Vdc, 250 mA @ 24 Vdc

Battery supply 11.5–15.0 Vdc (battery supply volts internal I/O value)

Battery charging circuit

1.2–12 Ah battery: max. charge current 0.7A @ >12V

Solar regulator Direct connection solar panel (to 30W)/solar battery 100 Ah

Loop supply Internal DC/DC converter: 24 Vdc/150 mA current limited


EMC FCC Part 15

RF (radio) FCC Part 15.247, RSS 210, AS/NZS4268

Hazardous area CSA Class I, Division 2

Safety EN 60950


Temperature rating –40 to +140°F (–40 to +60°C)

Humidity rating 0–99%RH noncondensing