On Wed, 18 Oct 2017, Drew Plaster wrote:

        MASTER SYSTEM

        nut.conf
MODE=netserver

        ups.conf
[TOPAPC]
    driver = usbhid-ups
      port = auto
     pollonly
     serial = "IS1309002707"
     desc = "TOPAPC"
[MIDAPC]
      driver = usbhid-ups
        port = auto
       pollonly
       serial = "IS1309001233"
       desc = "MIDAPC"
[BOTAPC]
      driver = usbhid-ups
        port = auto
       pollonly
       serial = "IS1309001213"
       desc = "BOTAPC"

Just to be sure that I understand your topology:

UPS TOPAPC, Data link to master, Power supply to master UPS MIDAPC, Data link to master, Power supply to slave1 UPS BOTAPC, Data link to master, Power supply to slave2

Shutdown plan: When wall power fails for any one of the three UPS units, they continue powering the master and the two slaves. When any one of the three UPS units reaches the status [OB LB]. the two slaves are shut down, and then the master is shutdown.

Is this correct? Roger

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