User manual

905U-G Wireless Gateway User Manual
Page 9©September 2004
Chapter 1 INTRODUCTION
1.1 905G Overview
The 905U-G Wireless Gateway products provide a wireless interface between various
fieldbus protocols used in process and automation
applications. The 905U-G includes an integral
900MHz license-free radio transceiver, and
transfers transducer and control signals (I/O) using
a highly secure and highly reliable radio protocol.
The 905U radio protocol is designed for very
efficient radio band usage, with event reporting
communications, automatic acknowledgment and
error-correction, peer to peer addressing, multiple
path routing, and frequency encoding and data
encryption for system security.
Application types include:
• The 905U-G interfaces between 905U wireless
I/O and various fieldbus protocols. Connect
wireless I/O to PLC’s, DCS, SCADA or
Internet.
• Wireless extension of factory automation buses
such as Profibus.
• Wireless interconnectivity between different
fieldbuses - Ethernet to Profibus to Modbus to
DF1.
• Combined networks of the above.
The 905U-G has eight on-board discrete I/O. Each
I/O point can be configured individually as a contact input signal, or a discrete output signal.
Input signals can sent via its fieldbus connection to a host device (PLC, DCS etc) or be
transmitted by radio to other 905U units. The output signals can be driven by a host device,
or linked to inputs on remote 905U units.
This document assumes the reader is familiar with the operation of the 905U I/O modules -
for further information, please refer to the User Manuals for these products.
Profibus
Ethernet
Modbus
DF1
Internet
905U I/O
905U I/O
Direct I/O
905U-G
Direct I/O
905U-G
Profibus
905U-G
Profibus
905U-G
Profibus
Ethernet
905U I/O
905U I/O
Direct I/O
905U-G
Direct I/O
Profibus
Modbus
905U-G
905U-G
905U-G
Modbus
905U-G
Ethernet
905U-G
Profibus