Weidmuller WI-MOD-945-E: 900Mhz Wireless Ethernet & Device Server v2.16 - Manual (Page 9)

Weidmuller Wireless Ethernet Modem & Device Server WI-MOD-945-E User Manual
Page 9 www.weidmuller.com Rev 2.136
CHAPTER 1 - INTRODUCTION
The WI-MOD-945-E Industrial 802.11 Wireless Ethernet module provide wireless connections between Ethernet devices
and/
or Ethernet wired networks (LAN’s) and complies with relevant IEEE 802.11 standard.
WI-MOD-945-E 802.11 630mW max power
WI-MOD-945-E-H 802.11 1000mW max power
The WI-MOD-945-E is a Direct Sequence Spread Spectrum (DSSS) wireless transceiver that utilizes the un-licensed 900
MHz frequency band for communications. There are various channels and bandwidths available depending on the country
and their radio regulations. If operating in the North America you can choose from the following 9 x 1.25MHz, 9 x 2.5 MHz,
4 x 5 MHz, 4 x 10 MHz or 2 x 20 MHz channels. If operating in Australia you can choose from 4 x 1.25 MHz, 4 x 2.5 MHz,
3 x 5 MHz or 1 10 MHz channels, etc. For a more information see section 3.1 -
“Selecting a Channel”
The WI-MOD-945-E unit also provides two serial connections as well as the Ethernet connections. It is possible to use all
three data connections concurrently, allowing the WI-MOD-945-E to act as a Device Server. Wireless connections can be
made between serial devices and Ethernet devices. The WI-MOD-945-E provides connection functionality between serial
“Modbus RTU” devices and Ethernet “Modbus TCP” devices. Appropriate driver applications will be required in the host
devices to handle other protocols.
The modem is VLAN compliant and capable of passing VLAN tagged frames by default. VLAN bridging and Routing
Modes are also available which will facilitate a number of different VLAN topologies.
The WI-MOD-945-E has a standard RJ45 Ethernet connection which will operate at up to 100Mbit/sec. The module will
transmit the Ethernet messages on the wireless band at rates between 1 and 54 Mbit/sec & 6 and 54 Mbit/sec depending
on model, band, encryption methods, and radio paths.
1.0 - Network Topology
The WI-MOD-945-E is an Ethernet device, and must be configured as part of an Ethernet network. Each WI-MOD-945-E
must be configured as an:
 “Access Point” or “Sta”, “Station”, Client”
Also needs to be configured as a:
 “Bridge” or “Router”.
You can also connect to the WI-MOD-945-E via a RS232
or RS485 serial port using serial server or PPP (point-to-
point) protocol. PPP allows the WI-MOD-945-E to connect
serial communications into the Ethernet network.
Access Point vs Client
The Access Point unit acts as the “wireless master” unit. The Access Point accepts and authorises links initiated but client
units, and controls the wireless communications.
Clients (Stations) are slave units and when connected to the
Access Point becomes transparent Ethernet link.
The first diagram shows a connection between two Ethernet
devices using WI-MOD-945-E Ethernet modems. In this
example one WI-MOD-945-E is configured as an Access Point
and the other as a Client - the Access Point can be connected.
Client
Ethernet
Device
Access
Point
Client Bridge Access Point
Bridge
LAN
192.168.0.73
192.168.0.72
192.168.0.71
A B
C D
E
192.168.0.69 192.168.0.70