www.cooperbussmann.com/BussmannWirelessResources 7
Cooper Bussmann BU-245U-E Wireless Ethernet & Device Server User Manual
CHAPTER 1 INTRODUCTION
The BU-245U-E Industrial 802.11 Wireless Ethernet module provide wireless connections between Ethernet devices and/or Ethernet wired
networks (LAN’s).They each comply with their relevant IEEE 802.11 standard.
The BU-245U-E is available in a range of different models with different RF power and frequency options suitable for your country’s local radio
regulations.
BU-245U-E-G 802.11 b/g 400mW max power
BU-245U-E-A 802.11 a 400mW max power
The above models have the same functionality but use a different radio to communicate.The different radios do not communicate with each other,
e.g. a BU-245U-E-G will not communicate with a BU-245U-E-A.Only modules of the same type are able to communicate wirelessly to each other.
Throughout this manual, any reference to “BU-245U-E”refers to one of the above models.
The BU-245U-E-G model uses a 2.4GHz Direct Sequence Spread Spectrum (DSSS) wireless transceiver.Users pick a 20MHz channel with 5MHz
channel spacing from the available 13 starting with the first channel centered on 2.412GHz. Some limitations depending on country see Appendix
C for channel selections.
Note that regulations in North America permit 11 x 2.4GHz channels and Europe permits 13 x 2.4GHz channels.
The BU-245U-E-A uses a 5GHz Direct Sequence Spread Spectrum (DSSS) wireless transceiver and users must select appropriate channel,
transmit power,etc allowable in that country.
Please check with your Cooper Bussmann representative for the permitted channel usage in your country.
See Appendix C for channels selections.
The BU-245U-E unit also provides two serial connections as well as the Ethernet connections. It is possible to use all three data connections con-
currently,allowing the BU-245U-E to act as a Device Server. Wireless connections can be made between serial devices and Ethernet devices. The
BU-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 BU-245U-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,encr yption methods and
radio paths.

1.1 Network Topology

The BU-245U-E is an Ethernet device, and must be configured as part
of an Ethernet network. Each BU-245U-E must be configured as an:
• “Access Point” or “Sta”, “Station”, ”Client”
• “Bridge” or “Router”
You can also connect to the BU-245U-E via a RS232 or RS485 serial
port using serial server or PPP (point-to-point) protocol. PPP allows
the BU-245U-E to connect serial communications into the Ethernet
network.
3A1576Rev1.6