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SATELLINE-EASy Pro

User Guide v.1.5

11 MESSAGE ROUTING

11.1 Introduction to Message Routing

Message Routing is an exciting feature in SATELLINE-EASy Pro. This feature allows messages from

terminal devices to be automatically routed over the radio modem network to a specified recipient

terminal.

In brief, the Message Routing works as follows:

 First, a radio modem reads any message coming from the terminal(s) attached to it.

 The radio modem detects the terminal address of the recipient, by seeking a pre-set

position inside the message for the address.

 The radio modem checks its internal route table to see, if there is route information

corresponding the address it has just found.

 The radio modem transmits a radio frame, which includes

 network id (see later)

 route information

 original user message encapsulated

 redundant information such as checksums for error checking etc.

 The radio modems along the route relay the frame over the network to the radio modem

at the destination.

 The radio modem at the destination first checks the validity of the received radio frame,

then extracts the original user message, and finally outputs it the terminal device attached

to it.

The figure left illustrates a possible structure of a

radio modem network.

M = Master station (Central station)

R = Repeater station

S = Slave station

T = Terminal device

Mob = Mobile terminal

Terminals are usually PLC devices that send and

receive messages according to a specific user

protocol.

Note: The term repeater used in the context of the Message Routing should not be mixed with the

Repeater Mode, which is a feature independent from the Message Routing.

R R

Mob

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Satel SATELLINE-EASy Betriebsanweisung Seite 80