HP Advanced Communications Controllers (ACC) Guía de usuario descargar pdf (Pagina 34)

100

101

ZCOM Message Handling

Terminal State

Chapter 234

Terminal State

Within the ZCOM subsystem, the terminal state may be either enabled

or disabled, activated or deactivated. For normal I/O operations, a

terminal ZLU must be both enabled and activated. If a terminal is

disabled (regardless of whether it is activated), then no messages can be

sent to it or received from it.

If a terminal is enabled but deactivated, then messages can be sent to

the terminal, but none can be received. The following table illustrates

the different combinations.

NOTE A terminal state of disabled overrides the activated/deactivated status.

For some protocols (such as the NCR 301 protocol), the protocol handler

automatically deactivates the terminal when a valid message is received

and until it has been processed. Each time a message is received, the

terminal must be reactivated by the receiving program, using the zcntl

command with the ‘activate’ request code (request code 9,

ZCOM_MRQCODE_ACT).

Terminal State SEND RECV

Enabled/Activated Yes Yes

Enabled/Deactivated Yes No

Disabled/Activated No No

Disabled/Deactivated No No

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