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A total of three Modbus clients can be connected to the Modbus
TCP port of CIU 262 and communicate simultaneously. Each
connection, called a socket connection, is handled independently.
If all three sockets are used simultaneously, a "Silence timeout" of
only one minute is used to prevent a complete occupation for a
long time.
"Static" IP
address
PC Tool, etc.
Mobile phone
Setup, status
and control
commands via
SMS
Fig. 22 Data connection from a PC to the CIU 262 directly
Clients
LAN
SCADA system
GRE router
PC Tool, etc.
Fig. 23 Cellular connection via VPN tunnel
42
Cellular network
Base station APN
"Static" IP
address
Cellular
CIU 262
with CIM
260 and
SIM card
VPN tunnel
Internet
Cellular operator
Cellular network
Base station APN
GRE router
Mobile phone
Cellular
Setup, status
and control
commands via
SMS
"Static" IP
address
CIU 262 with
CIM 260 module
and SIM card
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