Connect the Modem
Modem types
The RTU may be equipped with various modem types, depending on the application. Four
RS232 serial ports can be connected to an external modem.
Note! Before selecting the modem, always consult Xylem.
Table 11: This table gives an overview of the modem interfaces and functions.
Function COM 1 COM 2 COM 3 COM 4
Dialed up connection
GSM modem
X - X X
Dialed up connection
external modem
X - X X
Radio
communication,
polled system
X - X X
Dedicated line
modem
X - X X
Dedicated line
RS232/RS485
converter
X - X X
Service
- X - -
Ethernet adapter
X - X X
General instruction
Follow these steps to connect the modem.
Table 12
Step
Action
1 Connect the modem to COM port 1, 3 or 4.
2 Connect the modem power supply.
Reference: See respective modem manual for more information on how to connect the specific
modem.
Connect the Modem
Hardware for APP700 and APX700 Installation 17
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