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7 controller pass-thru mode, 8 peripheral pass-thru mode – Measurement Computing Micro 488/EX rev.2.1 User Manual

Page 42

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Section 3

IEEE Operating Modes

3.8

LOCAL

Send Go To Local to selected devices.

LOCAL

LOCKOUT Prevent local (front-panel) control of bus devices.

CLEAR

Clear all or selected devices.

TRIGGER

Trigger selected devices.

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

UNCONFIGDisable the Parallel Poll response of all bus devices.

SEND

Send low-level bus sequences.

RESUME

Unassert Attention. Used to allow Peripheral-to- Peripheral
transfers.

3.7 Controller Pass-Thru Mode

This mode is intended to provide bi-directional data transparent conversion

between an RS-232/RS-422 host computer and an IEEE 488 peripheral, such as a
printer or a HPIB™ plotter. The operation of this mode is covered in Section 6 of this
manual.

3.8 Peripheral Pass-Thru Mode

This mode is intended to provide bi-directional data transparent conversion

between an IEEE 488 controller and a serial device. This Peripheral Pass-Thru mode
does not require the serial device to control data to it. The is no command line parser
and, therefore, requires no serial commands. This mode of operation is described in
Section 7 of this manual.