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How do I find the MAC address and CRC on my 7847i internet communicator? By Petra Paulson The MAC and CRC numbers can be found on the 7847i's box. The twelve-digit number starting with 00-D0-2d... is your MAC address. The CRC number should be printed there as well, which How Do I Install a 7847i on a Vista-20P Security System? By Petra Paulson To install your 7847i internet communicator... Open its enclosure by pushing in the tabs located at the bottom of the 7847i. Then connect the 7847i to your Vista 20P control How does the 7847i Internet communicator connect to a Honeywell Security System keypad bus? By Petra Paulson The 7847i Internet Communicator lets users send full event data to central station. Make sure your system works with ECP communication before installing the 7847i. The ECP terminals