Hach SC1500 User Manual page 22

Figure 12 Connect a device
3.2.10 Connect to a cellular network
Connect the instrument to a cellular network with the USB connector in the USB box. Refer to the
illustrated steps that follow.
After the cover is installed, make sure that the screws are tight to keep the environmental rating.
3.2.11 Modbus TCP/IP expansion
Modbus TCP/IP is a standard for industrial communications. The Modbus TCP/IP protocol connects
computers to measurement and control systems that use the TCP/IP protocol for data transmission.
This type of data transmission is known as machine to machine (M2M) communication.
The Modbus TCP/IP software module enables the controller to be integrated directly in
programmable logic controller (PLC) systems. PLC systems record and process the controller
measured data. The data analysis and the procedures caused by the results are programmed in the
PLC system.
Note: To use the Modbus TCP/IP software module, make sure that there is no Modbus card installed on the
controller.
Connect the controller to the external USB box. Refer to the documentation supplied with the USB
box. It is possible to daisy chain controllers. Refer to Figure 13. When a modem or WiFi stick is
connected at the USB box, this channel connects the controller to the internet. Thus, it is not possible
to connect the controller with the modem to the internet and to operate Modbus TCP with WiFi at the
22 English