ProSoft RadioLinx FH Series, User Manual, Page: 24 / 151

RLX-FHE, RLX-FHES, RLX-FHS ♦ RadioLinx FH Radio Networks
Frequency-Hopping Industrial Radio
Page 24 of 151 ProSoft Technology, Inc.
November 25, 2008
An Ethernet wireless network allows two or more computers to communicate and
share data stored on each computer without having the traditional Ethernet
cabling between them. For example, one Master radio is connected to an
Ethernet device and a Remote radio is connected to another Ethernet device.
(The Master and Remote radios may or may not communicate through Repeater
radios.) The devices that can be connected include Ethernet hubs and switches.
Modbus TCP Network
Modbus is a serial protocol that has been an industrial communications standard
used in many applications over the years. It is a communications protocol that
was designed to communicate on serial RS-232 and RS485/422.
Recently, there has been a push to standardize on Ethernet as a new industrial
communications standard. Modbus has followed along with the standardization of
Ethernet by adapting an encapsulation of the serial Modbus protocol into a
TCP/IP packet.
The RadioLinx RLX-FHES has a Modbus TCP/IP server built into the radio. The
serial port on the radio becomes a data port that within the radio will encapsulate
a Modbus RTU packet into a Modbus TCP/IP packet. The radio will handle all the
translation between the serial slave device and the master/host device.