Product Guide VESDA ECO Detector by Xtralis
26 Principles of Operation 17898_05
RS485 Interface Connection
A number of ECO Detectors may be connected in a system and information
exchange occurs via a single Master controller which manages the interrogation of
the individual elements making up the monitoring system. This communication
allows remote setup, configuration and monitoring, including the communication of
alarms. (See section Event Logging
Communication between detectors and a PC or a customer’s existing data
acquisition system, is made using the RS485 4-wire bus interface or a USB
interface. The software protocol is the same in each case.
• The USB connection can only be made from one Master to one Slave unit at
a time;
• The RS485 connection can connect a single master to multiple slaves at one
time.
Xtralis VSC can connect to the ECO Detector using both mechanisms – USB and
RS485.
In order for a PC running VSC to be connected to an ECO, the PC will need to have
the correct interface drivers installed. Refer to Appendix B on page 86 for software
installation instructions.
The USB connection will only communicate with the one unit to which it is directly
connected. In this configuration the Modbus Address and protocol settings are
ignored. This allows Xtralis VSC to configure any ECO unit without prior knowledge
of its Modbus address or its serial interface settings.
Before adding an ECO Detector to a system connected by the RS485
communications bus, it needs to be assigned a unique Modbus address using a
suitable configuration tool such as Xtralis VSC.
When connected to an ECO via the USB interface it is possible to set the Modbus
Address that is used in other connectivity options as this “one-to-one” connection
allows communication independent of the Modbus Address.
Modbus Interface
The implementation of the Modbus interface for the ECO detector is integrated into
Xtralis VSC and Xtralis VSM4. Where a 3rd party control application is to be used
instead, the installer should refer to the ECO Modbus Interface specification,
document number 17887, available from your distributor or local Xtralis sales
representative.
USB Configuration
The USB configuration is not able to be altered by the user – once the driver is
installed on the PC the process is automatic. To determine the port number for
connection refer to Appendix B – Software Installation on page 86.
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