H-S81-HS Installation & Operation Manual — P/N LS10114-000HI-E:A 2/24/2015 23Communication Network Between Control Panels General Description1.6 Communication Network Between Control PanelsBy using CPU Ethernet interface, the logic status of the rules (Checked/Not checked) can beexchanged between several control panels. Control panels are divided into two categories: Master(receiving) and Slave (transmitting). Each control panel in the network can be indifferently slaveonly, master only or slave/master. Slave control panels send to Master ones all the sate changes ofthe rules set as remote in master control panel. For every panel can be imported up to 999 remoterules and can be exported up to 250 local rule. A maximum of 32 control panels can be connectedto each other in a network. Master control panels receive and process the sate changes sent fromslave control panels, and cyclically check the connection with the Slave control panels connected tothem. When the system is switched on, Master control panels request the IP address from the Slaveones existing in the configuration. Therefore, they send them the message identification code (IDcode). This code is generated random and is dynamically changed every minute and compared withthe one included in the messages from the Slave control panel for message validation. If the code ofa received message is not valid, the message is rejected. Master control panels make a new sub-scribe to Slave control panels every hour, for checking the existence of any configuration changes.If Slave control panel response is correct, the Master control panel will wait for the status changesfrom Slave control panels. During operation, the Master control panel cyclically tests the efficiencyof the connection to Slave control panels, and, in case of disconnection, signals it on the display.Signal propagation time between the various control panels may vary according to network traffic.However, in case of dedicated networks it will not exceed two seconds. Control panel network canbe made of copper or optical fiber by using the proper converters allowing a redundant loop con-nection able to support a possible failure or fiber break.Figure 1.8 Communication Network Between Control Panels
