9 Communication
Using the serial system bus interface, the TROVIS 5579 Heating and District Heating Control-
ler can communicate with a building control system. In combination with a suitable software
for process visualization and communication, a complete control system can be imple-
mented. The following communication settings are possible:
– Operation with a dial-up modem at the RS-232 system bus interface
Basically, communication is only established automatically when errors occur. The controller
works autonomously. Nevertheless, the modem can dial up to the controller at any time to
read data from it or otherwise influence it, if necessary. We recommend to use the modem
connecting cable (1400-7139).
– Operation with a leased line modem at the RS-232 system bus interface
Communication is established via a permanent connection between two leased line modems.
This setup is applied for long-distance transmissions or when different signal level converters
are used. The connection between controller and modem can also be established by the mo-
dem connecting cable (1400-7139).
– Operation at a four-wire or two-wire bus
To establish the link between controller and bus line, the signal level needs to be converted
by an appropriate converter (four-wire bus: SAMSON cable converter 1400-7308, two-wire
bus: SAMSON cable converter 1400-8800).
The TROVIS 5579 Controller is equipped with an RS-232 Modbus interface. Optionally, ca-
ble converters are available for operation with a four-wire (1400-7308) or two-wire bus
(1400-8800).
118 EB 5579 EN
Communication
RS232
RS485
RS232
RS485
RS232
RS485
RS 232C RS 232C
TROVIS 5579
TROVIS 5579
RS 485
GLT
Fig. 13 Network structure
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