Measurement Computing Digital HS - Manual (Page 15)

Polarity Selection for the iEND Control Line
2.2.2.2.6 S2-6 iDATA POL: Input Data Polarity
The input data bits can be active high or active low. For example, if a data byte of
&h07 is transferred from the input port with the iData Polarity selected for active low
operation, the data byte received by the IEEE 488 controller will be &hF8.
At power on, iRESET, Device Clear (DCL) or Selected Device Clear (SDC), the 16-
bit digital input latches are forced to a Not Full condition. Default setting is active
high.
OPEN
S2
iDATA POL
8 7 6 5 4 3 2 1
Active Low iDATA
OPEN
S2
iDATA POL
8 7 6 5 4 3 2 1
Active High iDATA
(default)
Polarity Selection for the Input Port Data Lines