Setting The Polarity - Keysight VXI Bus 75000 C Series User And Programming Manual

Using the Keysight E1458A Digital I/O Module

Setting the Polarity

The logical true level of the control (CTL) line, the flag (FLG) line, and the data
lines of each port can be set to either TTL High (> 2.5V) or TTL Low (< 1.4V)
levels. SCPI commands use the POLarity keyword as:
Example
This command sets the polarity to positive on port 1 data lines, a TTL High will be
input as a 1 or a bit set to 1 will output a TTL High level.
The *RST (reset) condition is positive polarity for control (CTL), flag (FLG), and
data lines on all ports.
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[SOURce:]DIGital:CONTroln:POLarity <POSitive or NEGative> to set the
control line's (CTL) polarity on port n.
[SOURce:]DIGital:FLAGn:POLarity <POSitive or NEGative> to set the flag
line's (FLG) polarity on port n.
[SOURce:]DIGital:DATAn:POLarity <POSitive or NEGative> to set the data
lines polarity on port n.
DIG:DATA1:POL POS
Keysight E1458A 96-Channel Digital I/O Module User Guide
Setting the Polarity