Appendix 4 - Modbus Protocol - janitza SVG Series User Manual

SVG 50/100
Appendix 4 – Modbus protocol
The Janitza SVG supports the Modbus protocol. The RS-485 interface of the SVG can
accommodate connection to an external USB port or a serial interface (via a 485/USB
converter or a 485/232 converter).
• LCD module: Connection to an external USB interface or a serial interface via the signal
interfaces 485P+ and 485P- (Figures 1 and 2).
• Module without display:Connection to an external USB interface or a serial interface
via the signal interfaces 485+ and 485- of the central monitoring module (Figures 3 and
4).
The Modbus communication protocol can be used for the acquisition and process
monitoring of all types of data; information on voltage, current, power, harmonics analysis,
I/O status and temperature are captured and evaluated.
The alarm information of the SVG is also captured via the Modbus protocol.
DIP switch
Figure 1 Connection of the 485 communication interface and the USB interface of external
devices
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Monitoring interface
485/USB
USB interface of the
converter
external device