Measurement Computing Digital488 - Manual (Page 50)

Section 3 Command Descriptions
3.20
Invert In
The Invert command is used to change the polarity of the handshake and data
lines. At power up all handshake and control lines are active high (logic one = + 5
volts). The Invert command can selectively change the polarity of each of the
handshake lines, and of the data lines. If multiple Invert commands are contained
within the same string, then an Execute command (X) should be included between
each Invert command. An alternative is to add the values of each Invert command
desired, and send one command with the sum of the desired commands. The Invert
commands are ORed together as received. To delete any one command, it is necessary
to program the default mode I0, then reprogram the desired commands.
I0 All control lines are active high, all data lines are high true
I1 Inhibit output is active low
I2 Trigger output is active low
I4 Data Strobe output is active low
I8 Clear output is active low
I16 Data is low true
I32 EDR input is falling-edge sensitive
I64 Service input is falling-edge sensitive
Example:
CLEAR 718 reset the Digital488
OUTPUT 718;"I32XI64X" select EDR and Service input as
falling-edge sensitive
Note:
OUTPUT 718;"I96X" performs the same function as above