805U-D Wireless Serial Modem

Key Features:

The ELPRO 805U-D Wireless Serial Modem is a robust, license-free serial transceiver capable of long-range communications .Operating at 869 MHz and up to 500 mW, the ELPRO 805U-D provides high-speed RS-232 and RS-485 connectivity up to 76.8 kbps while providing robust and secure two-way wireless serial communications in challenging environments typical of industrial monitoring and control applications.

• 869.525 MHz frequency at 500 mW RF power
• 869.875 MHz frequency at 5 mW RF power
• Radio data rate up to 76.8 kbps
• High-speed RS-232 and RS-485 data rate to 115 kbps
• Transparent/simultaneous broadcast and addressable device messaging
• LOS distance to 6 miles (10 kms) in a single hop; unlimited repeatability
•Low-power consumption mode with DTR control
• Forward error correction communications (CRC error checking with ARQ)
• Simplistic configuration for AT Hayes commands or Windows software
•Helpful diagnostics include radio signal strength and BER indication applications

Product Details

Transmitter and Receiver

Frequency 869.525 MHz, 869.875 MHz

Transmit power 500 mW, 5 mW

Transmission Direct frequency shift keying (DFSK)

Modulation Frequency shift keying

Receiver sensitivity

–106 dBm @ 14.4 kbps, –105 dBm @ 38.4 kbps

–103 dBm @ 76.8 kbps (1% FER)

Channel spacing Single 250 kHz channel

Data rate

14.4–76.8 kbps

Range (LoS)

6 miles (10 kms) @ 500 mW a

Antenna connector 1 x female SMA standard polarity

Serial Port

RS-232 DB9 female DCE; RTS/CTS/DTR/DCD (hardware  signals provided)

RS-485 2-pin terminal block (max. distance 4000′ (1.2 km), nonisolated)

Data rate (bps) 1.2 kbps to 115.2 kbps, configurable

Serial settings 7/8 data bits, stop/start/parity, configurable

Protocols and Configuration

System address Configurable 8-bit value (0–255)

Protocols supported Operating mode, radio, and serial settings

User configuration Windows software or AT Hayes commands via serial port

LED Indicators and Diagnostics

LED indicators Power/OK, radio TX/RX, serial TX/RX, DCD

Reported diagnostics RSSI measurements (dBm), bit error ratio (BER)


EMC EN 301 489-3

RF (radio) EN 300 220-2

Hazardous area ATEX Zone 2

Safety EN60950-1


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

Humidity rating 0–99% RH noncondensing

Power Supply

Nominal supply 10–30 Vdc, under/over voltage protection

Average current draw 70 mA @ 12V (idle), 50 mA @ 24V (idle)

Transmit current draw 350 mA @ 12V (1W), 250 mA @ 24V (1W)