6100 MPS-B Programming Manual

6100 MPS-B LINK MANAGEMENT

POLL State

A line is in POLL state immediately following a READ request

made by the application.

Transitions to POLL State

The following request causes a line to be in POLL state:

• The application makes a READ request. The state changes from

CONTROL to POLL. Subsequently, the specified station is

polled.

Transitions from POLL State

The following events leave a line in some other state (Figure 2-4

shows various state transitions):

• The polled station responds with text. The state changes from

POLL to READ.

• The polled station responds with NAK. The state changes from

POLL to CONTROL.

• The polled station does not respond within the amount of time

permitted (timeout). The state changes from POLL to CONTROL.

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