Measurement Computing Digital488/80A - Manual (Page 64)

H - Handshake
SYNTAX Hn Define handshake line n to be pulsed, where n = 0 , 1 , or 2 .
H0 Define the Clear output line to be pulsed.
H1 Define the Data Strobe output line to be pulsed.
H2 Define the Trigger output line to be pulsed.
H? 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 967695 Digital488/80A User's Manual