9-12 Database Date Code 20010518
SEL-2020 Instruction Manual
Port Status Register
000000 0000000 000
└───┬──┘│││││││└─┬─┘
│ │││││││ │ ┌Device Type
│ │││││││ │ │000 = Unused Port
│ │││││││ │ │001 = Printer Port
│ │││││││ └───┤ 010 = Other IED Port
│ │││││││ │011 = SEL IED Port
│ │││││││ └100 = Master Port
│ │││││││
│ ││││││└───────┬ 0 = Not Transparently Connected
│ ││││││ └1 = Transparently Connected
│ ││││││
│ │││││└─────────┬ 0 = Port Active
│ │││││ └1 = Port Inactive
│ │││││
│ ││││└───────────┬ 0 = Auto-Configuration OK, if
│ ││││ │ applicable
│ ││││ └1 = Failed Power-Up Auto-
│ ││││ Configuration
│ ││││
│ │ │ │ └─────────────┬ 0 = Connected on Power-Up
│ │││ └1 = Inactive on Power-Up; Auto-
│ │││ Configuration Pending
│ │││
│ │ │ └───────────────┬ 0 = No Modem or Modem is
│││ │ Disconnected
│││ └1 = Modem is Remotely Connected
│││
│ │ └─────────────────┬ 0 = M Settings Running
││ └1 = M Settings Disabled
││
│ └───────────────────┬ 0 = Port Communications OK
│└1 = Unable to Communicate with
│ Connected Device
│
└───────────────────────── Unused
The “Port Inactive” bit indicates a communications problem. Once the SEL-2020 has completed
its power-up initialization, this bit sets whenever the connected device fails to respond correctly
during the data collection process. The bit is cleared as soon as the SEL-2020 communicates
successfully again with the device. The “Port Inactive” bit may be set and cleared regularly if
the communications link is noisy.
The “Unable to Communicate with Connected Device” bit is set only when the SEL-2020 fails
on 10 consecutive attempts to communicate with the connected device. The bit is cleared as
soon as the SEL-2020 communicates successfully with the device. This bit generally indicates a
major communications problem, as opposed to an intermittent problem.
See the STATUS command description for a more complete discussion of the various port status
possibilities.
To Next Page
Loading...
