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© Carlo Gavazzi A/S
Simple Stand-alone Wiring
The below diagram example shows how to configure a simple stand-alone wiring�
The simple stand-alone system consists of two CPMs programmed as slave and master respectively�
The Parking Guidance System DMM provides power and Dupline
®
signal (1 Khz) on the L1 bus� The
standard DMM provides power and Dupline
®
signal for the L2 bus�
The L1 and L2 bus each has their own power supply because of the galvanic separation between the
two busses� The power supply on the right side of the diagram is for the display�
This simple stand-alone system can handle up to 120 sensors and send information on available
spaces either as
- RS485 Modbus information on the Parking Guidance System DMM, or
- RS485 on the slave CPM to a local display, or
- RS485 on the master CPM to a global display
The simple stand-alone example can be extended with many L1 buses monitoring up to 120 sensors
on each L1 bus�
It is possible to install an unlimited number of the CPM modules named “master monitor indicator”�
The function of the master monitor indicator is to show available spaces on the displays and nothing
else� The “master monitor” function does the same as the “master monitor indicator”, except that it
supplies also the entire L2 bus system with the multiplex signal� The multiplex signal is used to secure
that the number on the displays is counted and showed correctly�
The below diagram also shows a simple stand-alone Parking Guidance System but with 2 slave CPMs
(shows up to 240 spaces)� One master CPM and additionally one master CPM indicator module� Both
master modules are connected to displays� The master display shows the total number of available
spaces� The master CPM indicator only shows available spaces for one of the slave CPMs�
Fig. 67: Extended Carpark Wiring with Cabinet