used, e.g. multi-master polling and/or spontaneous communication from remote units and/or parallel
communication between remote units etc.
Note:
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.
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.
Note:
For SCADA Master set Master, for SCADA Slave set Slave.
•
Master
SCADA Master always sends addressed messages to Slaves. The way of addressing is different
from SCADA protocol to SCADA protocol, so this is one of the main reasons why an individual
Protocol utility in RipEX for each SCADA protocol has to be used.
○
Broadcast
List box: On, Off
Default = Off
Some Master SCADA units sends broadcast messages to all Slave units. SCADA application
typically uses a specific address for such messages. RipEX (Protocol utility) converts such
message to an IP broadcast and broadcasts it to all RipEX units resp. to all SCADA units within
the network.
If
On
, the address for broadcast packets in SCADA protocol has to be defined:
■
Broadcast address format
- List box Hex, Dec - format in which broadcast address is
defined.
■
Broadcast address
- address in the defined format (Hex, Dec)
○
Address translation
List box: Table, Mask
Default = Mask
In a SCADA protocol, each SCADA unit has a unique address, a "Protocol address". In RipEX
Radio network, each SCADA unit is represented by an IP address (typically that of ETH interface)
and a UDP port (that of the protocol daemon or the COM port server to which the SCADA device
is connected via serial interface).
A translation between "Protocol address" and the IP address & UDP port pair has to be done.
It can be done either via Table or via Mask.
So SCADA message received from serial interface is encapsulated into a UDP/IP datagram,
where destination IP address and destination UDP port are defined according the settings of
Address translation.
■
Mask
Translation using Mask is simpler to set, however it has some limitations:
− all IP addresses used have to be within the same network, which is defined by this Mask
− the same UDP port is used for all the SCADA units, which results in the following limitations:
− SCADA devices on all sites have to be connected to the same interface (COM1 or COM2)
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© RACOM s.r.o. – RipEX Radio modem & Router
Advanced Configuration
