Radio Interface / Radio Modem E805U-D
For wireless connection of RS-232 and RS-485 interfaces

The E805U-D provides a wireless connection between serial RS-232 or RS-485 interfaces. It is a cost-effective wireless alternative for connections of SPS, data loggers and computers or other devices. The E805U-D was developed for the uncomplicated and easy application. The radio modem is compact and has a radio module, power supply and serial interfaces integrated in a robust industrial casing. The radio transmission takes place via a royalty-free 869 MHz radio frequency with a performance of 500 mW and a range of up to 5 km. The installation occurs easy and reliable on a top-hat rail according to German standard DIN. If there are any questions about this Radio Interface / Radio Modem E805U-D have a look at the technical specification below or call: UK customers +44(0) 23 809 870 30 / US customers +1-410-387-7703. Our technicians and engineers will gladly advise you in all data loggers and all products in the field of measuring instruments, regulation and control and scales.

- Wireless connection between RS-232 and
  RS-485 interfaces
- Cost-efficient alternative for wireless connection
  of SPS, data loggers, computers and other
  devices
- Royalty-free 869 MHz frequency range
- Up to 5 km reach
- Transparent transmission mode
- Flexible repeater function

Presentation of radio transmission with 2 PCE-E805U-D in principle.

Technical Specifications

Serial interface

Standard baud rate: 1,200 until 115,200 baud RS-232 and RS-485 interfaces are internal connected with the same serial port. The serial interfaces have an asynchronous NRZ format. Characters with 7 or 8 bits with different parity and with 1 or 2 stopbits will be supported.
- RS-232: full duplex as a DCE device with
  RTS/CTS hardware Handshaking. Connection
  via 9 contacts SUB-D-socket.
- RS-485: half-duplex for Twisted Pair Mulitdrop
  Networks.
Input and output buffer: 2 Kbyte

Transmitter / Receiver

Separated channel, synthesized transmitter / receiver
Frequency: 869.4 MHz, 250KHz channel, 500 mW, expected reach in visual contact, with aerial with unit reinforcement 5 km (19.2 baud), 10 % 
relative cut-in time.
Frequency: 869.4 MHz, 250 KHz channel, 500 mW, expected reach in visual connection, with aerial with unit reinforcement 1 km (19.2 baud), 100 % relative cut-in time.
- RSSI -60 until -120 dBm
- RF data transmission rate: 19,200, 38,400,
  76,800 baud
The reach can be expanded:
- up to 5 interconnected repeater in regulated
  mode
- unlimited number of repeaters in transparent
  mode
Corresponds to standard EN 300 220
Aerial connection is SEMA coaxial

Data transmission

Transparent mode: data will be transmitted with a system and group address. The data 
transmission starts, when serial data will be received, whereas the minimum data volume is 530 byte. All modules with a correct system address that receive data packages will put out the data. Error checking is optional.
Controlled mode: data will be transmitted in packages with a system, source and target address with up to 5 interconnected repeater addresses and a 16 bit CRC error checking. Will the package be received with correct error checking only the target device will put out the data and will send back a ACK report (confirmation). If the source module does not receive an ACK report it will repeat transmission up to 4 times. DCD provides state of communication.
More: an automatic connection mode and a mode for selection control are available. CTS/RTS flow 
control will be provided based on availability of input buffer.

Configuration and diagnosis

Configuration via free of charge Windows software or Hayes AT commands. The diagnosis of radio 
noise emissions, signal strength and bit error rate are included. The value of radio signal strength is online for the main device available.

Power supply

10 – 30VDC / 12 – 24 VAC
normal power consumption:
12VDC / 70 mA or 24 VDC / 50 mA
power consumption during transmission:
12VDC / 350 mA; 24 VDC / 250 mA
power consumption sleep mode
12 VDC / 20 mA; 24 VDC / 15 mA

Indicators

LED indicators for processor OK, radio TX and RX, serial TX and RX (interfaces OK).

Connection

Removable terminal strap for easy installation of cable cross sections of up to 2.5 mm2.

Operation temperature

-40 °C until +60 °C, 0 – 99 % humidity

Standards

EMC according to ETS 300 683

Casing

Industrial stable aluminium casing

Installation

easy installation on top-hat rail

Delivery content

1x Radio Interface E805U-D (2 pcs. E805U-D are needed), software, user’s manual

Equipment

869 MHz aerial with 5 m cable and fixing

Contact:
PCE Instruments UK Limited
Unit 11 Southpoint Business Park
Ensign Way, Southampton
United Kingdom, SO31 4RF
Phone: +44(0) 23 809 870 30
Fax: +44(0) 23 809 870 39

Contact:
PCE Americas Inc.
1201 Jupiter Park Drive, Suite 8
Jupiter 33458 FL
USA
Phone: +1-410-387-7703
Fax: +1-410-387-7714

Below you will find an overview of the different product groups of measuring instruments