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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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HP Advanced Communications Controllers (ACC) Guia do Utilizador Página 34