Westermo EDW-120 - Manual (Page 11)

11 6616-2211
On the network side the EDW-120 has two serial server applications implemented at
each RS-232 port. The servers listen at different local TCP ports. Each serial server
application allows remote clients to connect. When a connection is established any
data sent to the server are transmitted at the corresponding serial interface. CH1 or
CH2. Vice versa data received at CH1 or CH2 are packed into a frame and sent to the
remote client. The serial channels are possible to configure individually (e.g. individual
packing algorithm and data format).
It is also possible to direct the two serial servers to the same serial channel, useful for
redundant SCADA.
TCP/IP
TCP/IP
Controller 1
(remote client 1)
Primary SCADA
controller 1
Secundary SCADA
controller 1
Secundary SCADA
controller 2
Primary
SCADA
controller 2
Communicating
with controller 1
Communicating
with controller 2
Communicating
with controller 1
Communicating
with controller 2
Controller 2
(remote client 2)
CH 1
CH 1
CH 2
CH 2