The ELPRO 905U-L Wireless I/O Installation Manual provides step‑by‑step instructions, safety information, and specifications for installing and configuring…
This Installation Manual explains how to install, configure, and test the ELPRO 905U-L Wireless I/O system. It covers safety requirements, antenna selection, power‑supply wiring, and detailed wiring of digital, analog, and thermocouple inputs and outputs.
Key sections include safety information, unit components and connections, antenna installation, power‑supply installation, input/output configuration, unit configuration and testing, and full technical specifications for both transmitter and receiver units. Ancillary hardware such as the RS‑232 serial cable is also documented.
| Digital inputs (transmitter) | 2 dry‑contact inputs, slow‑pulsed at 10 Hz |
|---|---|
| Status outputs (transmitter) | 2 separate System OK and Setpoint Status outputs |
| Analog input (transmitter) | 0‑20 mA differential, 16‑bit resolution, 0.1 % accuracy, 10 Ω impedance |
| Thermocouple input (transmitter) | J, K or T type with on‑board cold‑junction compensation |
| Power supply (transmitter) | 9‑30 VDC, 0.6 A |
| Transmitter frequency | 902‑928 MHz (FHSS) |
| Digital outputs (receiver) | 3 voltage‑free contacts, 250 VAC, 1 A, 30 VDC rating |
| Analog output (receiver) | 16‑bit resolution, 0.1 % accuracy, single‑ended source |
| Power supply (receiver) | 9‑30 VDC, 0.25 A |
| Radio receiver sensitivity | -110 dBm at 8 % PER |
The manual requires reading the safety information section, which warns about incorrect power‑wire termination, RF exposure limits, and FCC compliance before powering the unit.
The transmitter unit provides two dry‑contact digital inputs that are slow‑pulsed at 10 Hz.
The transmitter operates in the 902‑928 MHz frequency band using FHSS technology.