Measurement Computing Digital488/80A - Manual (Page 51)

Command Syntax Description
H Handshake 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.
I Invert Ival Define the polarity of the handshake and data lines, where
000
≤
val
≤
127 , as summed from the following states:
• 0 - (Default) All handshaking/control lines are active
high, all data lines are high true.
•
1 - The Inhibit output line is active low.
•
2 - The Trigger output line is active low.
•
4 - The Data Strobe output line is active low.
•
8 - The Clear output line is active low.
•
16 - The Data lines are low true.
• 32 - The EDR input line is falling-edge sensitive.
• 64 - The Service input line is falling-edge sensitive.
I? Returns the last Invert command executed.
Note: The Invert commands are OR ed together as received. To delete
any one command, it is necessary to program the default
mode
I0 , then reprogram the desired commands.
K End-Or-Identify Kn Define mode n of EOI , where n = 0 or 1 .
K0 (Default) EOI enabled; assert EOI on last byte transferred.
K1 EOI disabled; do not assert EOI on last byte transferred.
K? Returns the current EOI selection.
L Buffer Ln Clear the internal data buffer, where n = 0 only.
L? Returns the number of port readings in the internal data buffer
(from 0 to 2000 ).
M Service Request
Mask
Mmask Define the Service Request ( SRQ ) conditions, where
00
≤
mask
≤
31 , as summed from the following states:
•
0 - (Default) SRQ is disabled.
•
1 - SRQ on Service input transition.
• 2 - SRQ on EDR input transition.
•
4 - SRQ on IEEE 488 bus error.
•
16 - SRQ on Ready.
Note: The Service Request Mask commands are OR ed together as
received. To delete any one command, it is necessary to
program the default mode
M0 , then reprogram the desired
commands.
O Recall Configuration Oval Load configuration val , where val = value from 0 to 100 .
O? Returns currently loaded configuration val .
P Port Select Pn Select port(s) n for data I/O, where n = value from 0 to 5 .
P0 (Default) Select all 5 ports.
P1 Select Port 1.
P2 Select Port 2.
P3 Select Port 3.
P4 Select Port 4.
P5 Select Port 5.
P? Returns current port(s) selection n .
Q Inhibit Qn Define mode n of Inhibit output line, where n = 0 or 1 .
Q0 Clear the Inhibit line (return to unasserted state).
Q1 Set the Inhibiti line (place in the asserted state).
Q? Returns current Inhibit output line mode n .
Digital488/80A User’s Manual 967695 Digital488/80A Commands 45