Measurement-computing Micro 488/EX rev.2.1 Uživatelský manuál stáhnout pdf (Strana 38)

Section 3 IEEE Operating Modes

3.4

ENTER

Receive data from a bus device.

OUTPUT

Send data to bus devices.

PASS

CONTROL

Give up control to another device which becomes the Active

Controller.

SPOLL

Serial Poll a bus device, or check the Service Request state.

PPOLL

Parallel Poll the bus.

PPOLL

CONFIG

Configure Parallel Poll responses.

PPOLL

DISABLE

Disable the Parallel Poll response of selected bus devices.

PPOLL

UNCONFIG

Disable the Parallel Poll response of all bus devices.

SEND Send low-level bus sequences.

RESUME

Unassert Attention. Used to allow Peripheral-to- Peripheral

transfers.

3.4 System Controller, Not Active Controller Mode

After Passing Control to another device, the System Controller is no longer the

Active Controller. It acts as a Peripheral to the new Active Controller, and the allowed

bus commands and their actions are modified accordingly. However, it still maintains

control of the Interface Clear and Remote Enable lines. The available bus commands

and their actions are:

ABORT

Pulse Interface Clear.

LOCAL Unassert Remote Enable.

REMOTE

Assert Remote Enable.

ENTER

Receive data from a bus device as directed by the Active

Controller.

OUTPUT

Send data to bus devices as directed by the Active

Controller.

REQUEST Set own Serial Poll request (including Service Request)

status.

SPOLL

Get own Serial Poll request status.

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