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# Terminal / Host ISO Async

Carrier

Clocking

Driver Type

Initial State

NAU Name

Pause

Physical Line

Reply Timeout

Retry Count

RS-232 Protocol Type

Signal Control

Slow poll Timer

Speed

  Some of these parameters are specific only to Terminal operation.

NAU Name

  This optional field enables you to assign a name to the port. NAU names must be unique to the unit.
  Range: Up to eight alphanumeric characters

Initial State

  This option defines the port's state at system startup. If disabled, an operator must manually enable the port.
  Range: Enabled or Disabled

Carrier

  This selects the type of carrier used by the port.
  Range: Switched (modem), or Constant

Clocking

  This option determines whether the port supplies or receives the clocking signal.
  Range: Internal (supplies) or External (receives)

Speed

  This value determines the speed at which the port operates. If the port is externally clocked, the speed is determined by the clocking device, providing it doesn't exceed the maximum rate.
  Range: Dependent upon the attached devices

Signal Control

  This parameter enables you to control signals on the line.

Physical Line

  This parameter defines the physical line type.
  Range: DCE (internally clocked) or DTE (externally clocked)

Slow poll Timer

  This parameter defines how often a TISO port will poll a device when the TISO port has determined that a device is not responding. The TISO port determines that a device is not responding when the device does not respond for the amount of time configured in the response timer (RTI) times the number of retries configured in the retry count value (RET).
  Range: 1 -- 99 seconds

Pause

  This value defines the elapse time between each polling cycle. If the total poll/response time for all PUs on the line is less than the remaining pause value, there will be a pause of the remaining time. During this pause, the line falls into a poll-wait state. If the total poll/response time for all PUs on the line is equal to or greater than the pause value, the next polling cycle begins immediately.
  The pause value is configured in seconds from 0 to 25.5 seconds in 0.05 increments.
  Range: 0 -- 25.5 seconds (in .05 increments)

RS-232 Protocol Type

  This value defines how signals are brought up when the port is activated. Constant brings signals up immediately, Activated brings signals up when incoming required signals are detected, and Two Wire brings up signals immediately and ignores incoming required signals.
  Range: Constant, Activated, or Two-Wire

R eply Timeout

  This value defines the time that is allowed to lapse between a link control command and receipt of a response.
  Range: 1 -- 255 (1/20 of a second)

Retry Count

  This value defines the number of timeouts a device can have before the terminal port determines that the device is not responding and starts slow poll mode for the device.
  Range: 1 -- 8 times

Driver Type

  This value defines which physical layer mode is used.
  Range: ISO (isochronous), or ASY (asynchronous)