User manual

Chapter Three Operation
Page 31 March 2010
wireless data. The default setting is “None”.
Encryption Keys 1 to 4 These are the keys used to encrypt radio data to protect data from
unwanted eavesdroppers. These keys must be set the same for all
WI-MOD-9-E units in the same system. If encryption is not selected,
the Key values can be ignored.
These keys will be automatically generated by the System Generator
String - however the encryption keys can be manually changed. If
they are manually changed, you need to make the same change to all
modules in the system.
Each of the fields are 5 bytes in length for 64-bit encryption and 4
bytes for 128-bit AES encryption. These keys must be entered as
hexadecimal numbers separated by colons.
For example, 12:AB:EF:00:56. for 64bit encryption, and
12:AB:EF:00 for 128bit AES encryption
Encryption keys must not be all zeros, i.e. 00:00:00:00:00
64bit encryption uses each key alternatively for each radio packet.
128bit AES encryption combines these keys to form a single 128bit
key, used on all radio packets.
Save and Reboot. Save settings to non-volatile memory, and reboot WI-MOD-9-E.
3.6 Ethernet Data
All Ethernet devices are uniquely identified by a MAC Address that identifies the hardware
device. These addresses are factory-set and are six bytes in size and are expressed in
hexadecimal in the form xx:xx:xx:xx:xx:xx
Ethernet messages can be addressed to a single device (a point-to-point message) or can be
directed towards multiple destinations by using Multicast addresses and Broadcast addresses.
The broadcast address is used to send data to all devices. The broadcast address is
FF:FF:FF:FF:FF:FF.
Multicast addresses are used to direct data at a set of devices. Multicast addresses may be
recognized as they always have the least significant bit of the first byte of the MAC Address set.
For example, 01:00:5E:00:00:00 is a multicast address, 01:80:C2:00:00:00 is also a multicast
address.