Hach-Lange SC 1000 Controller Enhanced Communications - Manual (Page 30)

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Installation
3.9 GPRS connection via fixed IP service and VPN server of the mobile
network operator
There are often problems associated with connecting to a company's own private
network. For this reason, fixed IP providers usually also offer this service.
The mobile network operator connects the user to the fixed IP provider via a private VPN
tunnel. The sc1000 controller does not require its own VPN client in this case. The user
requires VPN client software on his/her PC in order to connect to the fixed IP provider.
3.10 Optional Modbus TCP expansion
Modbus TCP is a standard for industrial communication. Through Modbus TCP,
computers can be connected to measurement and control systems that use the TCP/IP
protocol for data transmission. This form of data transmission is termed M2M
communication (M2M = machine to machine).
Note: In order to use the Modbus TCP software module, NO Modbus card must be installed in the
sc1000 controller.
The Modbus TCP software module enables the sc1000 controller to be integrated directly
in PLC systems (PLC = programmable logic controller). PLC systems record data
measured by the sc1000 controller and process this data further. Analysis of the data
received and the resulting actions are programmed in the PLC system.
3.10.1 Requirements associated with Modbus TCP
The Modbus TCP software module must be activated/licensed for use in the sc1000
controller.
Figure 23 GPRS connection via fixed IP service and VPN server of the mobile network operator