The Elpro 805U-D radio modem provides RS232 or RS485 connections by radio.
It is a low cost wireless alternative for linking PLC’s, data loggers, supervisory computers and intelligent transducers.
The 805U-D has been designed to be easy to use and simple to install. It uses a low power 868MHz radio which does not require a radio licence in most European countries or South Africa.
The module is fully integrated with radio, power supply, serial ports and microprocessor controller housed in a strong industrial aluminium case.
- Licence-free 868MHz radio band (Europe/South Africa)
- Wireless data up to 76.8Kbps
- Typical line of sight 5km (@ 500mW)
- Configuration by Hayes AT commands or Windows Configuration software
- Radio data rate up to 76 800 bits/sec
- Seperate RS232 / RS485 ports up to 115.2Kbps
- Single hop distance 5 km line-of-sight
- Repeater function for longer distances, unlimited repeater hops
- Forward error correction, CRC error checking with ARQ
- Turn-around time 5 msec
- Radio signal strength and BER indication
- Transparent broadcast mode, peer to peer
- Addressed mode, multipoint and point-to-point
- Low power mode with DTR control
- On-line "dial-up" control using AT commands
- Repeater functionality in all units
- Repeater routing via address selection
- Security against cross-talk between systems
Indicative Applications
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Elpro 805U-D Frequency Options
| Frequency | Frequency Band | TX Power | Channel Spacing |
| 869MHz | 868.525MHz | 500mW | 250KHz |
Note: Specifications subject to change.
General Specifications
| Temperature | -40°C to +60°C |
| Humidity | 0-99%RH Non-Condensing |
| Housing | Aluminium: 115 x 165 x 32mm |
| Mounting | DIN rail mounting |
| Terminal strip | Removable: up to 2.5mm2 (12 gauge AWG wires) |
| Compliances • EMC • Radio • Safety |
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System Configuration Parameters
| System/group address | Configurable 8 bit value (0-25) |
| Configurable parameters | Broadcast mode, addressed mode, optimum path routing mode, baud rate (14.4 - 76.8Kbps); serial port 1.2 - 115.2Kbps |
| User configuration | Via serial port |
Power Supply Specifications
| Nominal Supply | 11 to 30VDCC; under/over voltage protection |
| Quiescent current draw | Normal: 70mA @ 12VDC: 50mA 24VDC Power saving mode: 20mA @ 12VDC: 15mA 24VDC |
| Transmission current draw | 350mA @ 24VDC; 250mA @ 24VDC (1W) |
Radio Specifications
| Modulation/band(s) | DSFK*, 868.525 MHZ |
| Transmit power | 868.525MHZ: 500mW |
| Receiver sensitivity | -111dBm |
| Data rate | Up to 115.2 Kbps |
| Line of sight range max** | 500mW - 5km out of plant: 1km in obstructed environments |
| Antenna connector | SMA female (Surge diverter: CSD-SMA-2500) |
Note: Specifications subject to change.
• *DSFK - Digital Frequency Shift Key
• **As with all distances quoted, these are dependant on local terrain/obstacles