Satel SATELLINE-EASy Guide de l'utilisateur télécharger pdf (Page 81)

SATELLINE-EASy Pro

User Guide v.1.5

11.1.1 Features of Message Routing

The Message Routing feature of the SATELLINE-EASy Pro is designed to be a fast and transparent

to fit real time systems. The features include:

 Transparent to user protocols.

 Easy construction of a network containing several repeaters.

 Any radio modem may operate as a repeater, i.e. dedicated repeaters are not usually

needed thus cutting down on costs.

 Large areas of coverage may be implemented by using only one radio channel.

 The use of mobile substations is also possible to some extent.

 The system will be fully deterministic i.e. the transmission delays are predictable. Because

of that, the principle of Message Routing is connectionless.

 Added redundancy, as a failing radio modem can be, in certain cases, bypassed with

another radio modem positioned in the same coverage area.

 Message Routing is intended mainly for the protocols based on polling scheme and a

single master station.

11.1.2 Limitations of Message Routing

 It is assumed that the position of the address field in the user messages is fixed. However

some special protocols are supported:

o IEC 60870-5-101 is a protocol commonly used in control applications of power

lines.

o RP570 protocol

 The message cannot end to the address; there must be at least one character after the

address.

 It is assumed that there is only one message at a time inside the network simultaneous

messages could cause collisions.

 The max number of the routes depends on the actual hardware and the Firmware version.

 Operation of the Tx / Rx addresses is automatically blocked in the case of switching the

“Message Routing” function on.

11.1.3 Getting started with Message Routing

The design of any radio modem system requires very precise planning. Once the choices between

devices, their location, installation, maintenance etc. are clear, the Message Routing for the

system can be implemented.

Planning your Message Routing System

1. Decide which mode of the Message Routing suits the system - Source Mode or Virtual Mode.

See the following paragraphs for details.

2. Design a layout of the system describing the settings such as protocol, addresses of the

terminal equipment, radio frequencies and so on.

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Satel SATELLINE-EASy Guide de l'utilisateur Page 81