Westermo RedFox Series - Manual (Page 948)

Westermo OS Management Guide
Version 4.17.0-0
41.1.1 Introduction to MicroLok and the WeOS MicroLok Gateway
The MicroLok II Peer Protocol[ 3 ] provides a service where multiple communication
sessions between MicroLok Stations can be multiplexed over serial lines. The
WeOS MicroLok Gateway can be used to extend the MicroLok network over an
IP network, by encapsulation the data packets from the serial side into IP/UDP
packets. The packets will be received by a remote MicroLok Gateway, which will
decapsulate the IP/UDP packets before forwarding on its serial side.
Microlok
"Concentrator"
Sta1
Sta2
Sta3
StaN
Sta1
Sta2
Sta3
StaN
Microlok
"Concentrator"
Microlok
GW
(WeOS)
Microlok
GW
(WeOS)
Digout
Serial
Serial
(Diagnostics)
Serial
Serial
(Diagnostics)
Intranet/
Internet
Figure 41.1: Use of MicroLok Gateways to extend a MicroLok network.
MicroLok Diagnostic data is assumed to use the WeOS Serial Over IP service (see
chapter 39 ) on a different serial port or a different WeOS unit, and is not cov-
ered by the MicroLok Gateway functionality specified here. (The dashed lines in
Fig. 41.1 illustrates the use of a separate serial port for diagnostic data.)
The WeOS MicroLok gateway listens for MicroLok packets on its serial interface,
and forwards them as IP/UDP packets to a remote MicroLok Gateway if a match
is found in its MicroLok Address Table. Similarly, the gateway listens for MicroLok
IP/UDP packets, and forwards them on its serial port. General MicroLok settings
for IP interface and UDP port, etc., is described further in
section 41.1.1.1 .
The example topology in fig. 41.1 can be extended to use more than two MicroLok
gateways. And WeOS units with more than one serial port is able to connect local
MicroLok stations on all its serial ports. Further information on connecting local
and remote MicroLok stations is given in
section 41.1.1.2 when describing the
address lookup table.
The MicroLok gateway will keeps track of initialised MicroLok sessions, and will
drop MicroLok packets not being part of an established session. The gateway will
also monitor established sessions, and is able to signal an alarm if one or more
sessions are determined down, see
section 41.1.2 .
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