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9 Communication
Using the serial system bus interface, the TROVIS 5179 District Heating Controller can commu
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nicate with a building control system. In combination with a suitable software for process visual
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ization and communication, a complete control system can be implemented.
The following communication settings are possible:
– Operation with a dial-up modem at the RS-232-C 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 connect
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ing cable (1400-7139).
– Operation with a leased line modem at the RS-232-C 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 via the mo-
dem connecting cable (1400-7139).
– Operation at a four-wire bus
To establish the link between controller and bus line, the signal level needs to be converted by a
converter (SAMSON’s cable converter 1400-7308).
The TROVIS 5179 District Heating Controller is fitted with a Modbus interface RS-232. Op
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tionally, a cable converter for four-wire bus (1400-7308) is available.
76 EB 5179 EN
Communication
RS232
RS485
RS232
RS485
RS232
RS485
RS 232C RS 232C
TROVIS 5179
TROVIS 5179
RS 485
GLT
Fig. 7 · Network structure