•
Master
TheSCADA Master always sends addressed messages to Slaves. Addressing is different for each
SCADA protocol, so this is one of the main reasons why an individual Protocol server in each Unit
for each SCADA protocol has to be used.
○
Broadcast
List box: On, Off
Default = Off
Some Master SCADA units send broadcast messages to all Slave units. SCADA applications
typically use a specific address for such messages. RipEX (Protocol utility) converts such mes-
sages into a customized IP broadcast and broadcasts it to all RipEX units resp. to all SCADA
units within the network.
Note
Broadcasts in the GPRS/UMTS network are not possible, thus setting of broadcast
functionality is not allowed with M!DGE/MG102i units.
If
On
, the address for broadcast packets in the SCADA protocol has to be defined:
■
Broadcast address format
- List box Hex, Dec - format in which the 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 a
GPRS/UMTS mobile network, each SCADA unit is represented by an IP address (typically that
of the 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 the "Protocol address" and the IP address & UDP port pair has to be
done. It can be done either via Table or Mask.
Hence, a SCADA message received from the serial interface is encapsulated into a UDP/IP
datagram, where the destination IP address and the destination UDP port are defined according
to the settings of the Address translation.
■
Mask
Translation using the 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:
− SCADA devices on all sites have to be connected to the same interface
− only one SCADA device can be connected to one COM port
•
Base IP
Default = IP address of the ETH interface
When creating the IP destination address of UDP datagram, in which the serial SCADA
message received from COM is encapsulated, thi is created, this Base IP is taken as the
basis and only the part defined by the Mask is replaced by the 'Protocol address'.
•
Mask
Default = 255.255.255.0
A part of the Base IP address defined by this Mask is replaced by the 'Protocol address'.
The SCADA protocol address is typically 1 byte, so Mask 255.255.255.0 is most frequently
used.
•
UDP port (Interface)
List box: COM, Manual
51
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Web Configuration
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