Router Mode - RACOM RipEX User Manual

2. Parallel repeaters
Repeater2
Centre
Repeater1
Remote1
GOOD

2.3. Router mode

RipEX works as a standard IP router with 2 independent interfaces: Radio and ETH. Each interface
has its own MAC address, IP address and mask.
IP packets are processed according to routing table rules. You can also set the router's default gateway
(applies to both interfaces) in the routing table.
The COM ports are treated as standard host devices, messages can be delivered to them as UDP
datagrams to selected port numbers. The destination IP address of a COM port is either the IP of ETH
or the IP of a radio interface. The source IP address of outgoing packets from COM ports is always the
IP of the ETH interface.
The additional Virtual COM ports and Terminal server can act as other IP router ports. This enables
Serial and TCP based RTUs to be combined in one network.
Two different Radio protocols are available in the Router mode: Flexible and Base driven.
• Flexible
Suitable for master or even multi master-slave polling and report by exception from remotes concur-
rently. No limits in network design – each radio can work as base station, a repeater, a remote, or
all of these simultaneously
• Base driven
This protocol is optimized for TCP/IP traffic and/or 'hidden' Remotes in report-by-exception networks,
when a Remote is not be heard by other Remotes and/or different Rx and Tx frequencies are used.
It is suitable for a star network topology with up to 255 Remotes under one Base station, where
each Remote can simultaneously work as a Repeater for one or more additional Remotes.
© RACOM s.r.o. – RipEX Radio modem & Router
Remote2 WRONG
CEN
RPT2
CEN
RPT1
REM2
RPT2
RPT1
REM1
X
COLLISION!
REM2
REM1
RipEX in detail
Improperly designed network:
- RipEX REM1 is within the range
of two repeaters (RPT1 and RPT2).
The repeaters receive a packet (1)
from the centre (CEN) and repeat
it at the same time (2) causing a
collision at REM1.
Well-designed network:
- A remote is only in the range of a
single repeater (REM1-RPT1,
REM2-RPT2).
There is always only one repeater
where the centre and remote cov-
erage areas overlap.
19