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RipEX radio network works in IP environment, so the basic task for Protocol interface utility is to
convert SCADA serial packets to UDP datagrams. The Address translation settings are used to
define the destination IP address and UDP port. Then these UDP datagrams are sent to RipEX
router, processed there and they are typically forwarded as unicasts to Radio channel to their des-
tination. When the gateway defined in the Routing table belongs to the Ethernet LAN, UDP datagrams
are rather forwarded to the Ethernet interface. After reaching the gateway (typically a RipEX router
again), the datagram is forwarded according to the Routing table.
Note
Even if UDP datagrams, they can be acknowledged on the Radio channel (ACK para-
meter of Router mode), however they are not acknowledged on Ethernet.
When the UDP datagram reaches its final IP destination, it should be in a RipEX router again (either
its ETH or Radio interface). It is processed further according its UDP port. It can be delivered to
COM1(2) port daemon, where the datagram is decapsulated and the data received on the serial
interface of the source unit are forwarded to COM1(2). The UDP port can also be that of a Terminal
server or any other special protocol daemon on Ethernet like Modbus TCP etc. The datagram is
then processed accordingly to the respective settings.
RipEX uses a unique, sophisticated protocol on Radio channel. This protocol ensures high probab-
ility of data delivery. It also guarantees data integrity even under heavy interference or weak signal
conditions due to the 32 bit CRC used, minimises the probability of collision and retransmits frame
when a collision happens, etc., etc. These features allow for the most efficient SCADA application
arrangements to be used, e.g. multi-master polling and/or spontaneous communication from remote
units and/or parallel communication between remote units etc.
Note
1.
These Radio protocol features are available only in the Router mode. The Bridge
mode is suitable for simple Master-Slave arrangement with a polling-type application
protocol.
2.
All timeouts in parameters described below are calculated from time, when packet
is sent into COM driver, i.e. it includes the transfer time of the packet. Take it into
account especially when there is a low Baud rate set in COM settings.
■
Common parameters
The parameters described in this section are typical for most protocols.
There is only a link to them in description of the respective Protocol.
Mode of Connected device
List box: Master, Slave
Default = Master
Typical SCADA application follows Master-Slave scheme, where the structure of the message is
different for Master and Slave SCADA units. Because of that it is necessary to set which type of
SCADA unit is connected to the RipEX.
Important
For SCADA Master set Master, for SCADA Slave set Slave.
Master
RipEX Radio modem & Router – © RACOM s.r.o.
146
Advanced Configuration
Содержание RipEX
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