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245U-E Wireless Ethernet Modem User Manual
7
Rev Version 2.24
Chapter 1 - INTRODUCTION
The 245U-E Wireless Ethernet Modem and Device Server is an industrial 802.11-compliant module that
provides wireless connections between Ethernet devices and/or Ethernet wired networks (LANs). The
245U-E is available in two models with different RF power and frequency options suitable for your country’s
local radio regulations. The models comply with their relevant IEEE 802.11 standard.
245U-E-G
802.11 b/g 400 mW max power
245U-E-G1
802.11 b/g 60 mW max power
245U-E-A
802.11 a 400 mW max power
245U-E-A1
802.11 a 630 mW max power
The 245U-E-G and 245U-E-A have the same functionality, but use a different radio to communicate. The
two types of radios do not communicate with each other, that is, a 245U-E-G will not communicate with
a 245U-E-A or an A1. Only modules of the same type are able to communicate wirelessly with each other.
Throughout this manual, any reference to 245U-E refers to one of the above models.
The 245U-E-G model uses a 2.4-GHz direct sequence spread spectrum (DSSS) wireless transceiver. Users
pick a 20-MHz channel with 5-MHz channel spacing from the available 13 channels, starting with the
first channel centered on 2.412 GHz. There are some limitations depending on country. See “Appendix C
- CHANNELS” for channel selections. Note that regulations in North America permit 11 x 2.4 GHz channels
and Europe permits 13 x 2.4 GHz channels.
The 245U-E-A uses a 5-GHz DSSS wireless transceiver, and users must select appropriate channel and
transmit power allowable in their country. Check with your ELPRO representative for the permitted channel
usage in your country. See “Appendix C - CHANNELS” for channels selections.
The 245U-E unit also provides two serial connections in addition to the Ethernet connections. It is possible
to use all three data connections concurrently, allowing the 245U-E to act as a device server. Wireless
connections can be made between serial devices and Ethernet devices. The 245U-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 245U-E has a standard RJ45 Ethernet connection that will operate at up to 100 Mbit/sec. The module
will transmit the Ethernet messages on the wireless band at rates between 1 and 54 Mbit/sec and 6 and 54
Mbit/sec, depending on model, band, encryption methods, and radio paths.
1.0 Network Topology
The 245U-E is an Ethernet device, and must be configured as part of an Ethernet network. Each 245U-E
must be configured as an:
• Access Point or Sta, Station, Client
• Bridge or Router
You can also connect to the 245U-E via a RS232 or RS485 serial port using serial server or Point-to-Point
(PPP) protocol. PPP allows the 245U-E to connect serial communications into the Ethernet network.
