Measurement-computing Digital488/80A Manuel d'utilisateur télécharger pdf (Page 64)

H - Handshake

SYNTAX

Hn Define handshake line n to be pulsed, where n = 0, 1, or 2.

Define the Clear output line to be pulsed.

Define the Data Strobe output line to be pulsed.

Define the Trigger output line to be pulsed.

Returns the last Handshake command executed.

DESCRIPTION

The Handshake (

H) command enables software control of three handshaking/control lines -- Clear, Data Strobe, and

Trigger -- independent of any other I/O operations. When the Digital488/80A receives a Handshake command, the

respective handshaking/control line is pulsed for approximately 50 microseconds. The line returns to its steady-state

condition after pulsing. The Invert (

I) command may be used to change the active state of any of these

handshaking/control lines.

For information on the Inhibit output line, refer to the Inhibit (

Q) command. For information on the Service input line,

refer to the Service Request Mask (

M) command. For information on the External Data Ready (EDR) input line, refer to

the Data Ready (

R) command. The Invert (I) command may be used to change the active state of any of these

handshaking/control lines as well.

EXAMPLE

PRINT#1,"OUTPUT08;H1X"

Line 1: Pulse the Data Strobe line on Digital488/80A Channel 0.

58 Digital488/80A Commands

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Measurement-computing Digital488/80A Manuel d'utilisateur Page 64