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3. Communication Configuration:
Supervising the FG-SYS Digital Units using TOPSurveillance™ Software
3.1. General
The supervision of the FG-SYS Digital Unit is achieved using the JBUS/MODBUS protocol and the
serial link RS232C or RS422/485.
These JBUS and MODBUS master-slave type protocols have been developed to allow monitoring of
multiple security systems (slaves) by a master supervisor, via a single cable (or other physical media);
these security systems are identified by a unique slave number.
The communication is always point-to-point, type question-answer, with only one device using the
connexion line at a time.
The user of our FG-SYS Digital Unit could configure slave numbers from 1 to 99 and thus the
simultaneous connexion of several central units to existing communication line is easy and very simple
to do.
The TOPSurveillance™ is a supervisor software developed especially for the liquid leaks detection
and location FG-SYS Digital Unit. This software is installed on a PC or another Microsoft Windows-
compatible workstation. The physical connection between the PC and the FG-SYS detection digital
unit(s) is achieved via a serial cable, connected to the serial port on the PC and on one of the two
serial terminal blocks available on the circuit of the digital unit(s).
The use of the JBUS (MODBUS) protocol permits downloading all the useful information from the
central units to the PC and the association of the digital data about the liquid leaks with a pin-pointing
representation of the alarms on the map of the supervised area.
For one central unit and for short serial link (up to 100 m), it is recommended to use the RS232C
interface implemented on both the PC and the FG-SYS central units.
To connect multiple digital units, and for distances exceeding 100 m, it is imperative to use the RS422
or RS485 interface, available from the SERIAL 1 or SERIAL 2 connectors of the FG-SYS digital units.
The serial ports on the PC are usually RS232. Therefore, it is also necessary to connect an RS422
(RS485)-RS232C adapter between the JBUS connecting cable and the serial port on the PC. The
connecting cable must have a characteristic impedance close to 120 ohms and the maximum length of
this cable between the PC and the most remote digital unit must be less than 1200 m.
(™) FROG-SYS and TOPSurveillance are trademarks of TTK S.A.S..
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