A-Class   137 
GPIO A 
Signals 
GPIO B 
Signals 
GPIO A 
Signals 
GPIO B 
Signals 
Indicators and Monitors 
 
Real-time verification of settings and activity of the GPIO ports is available via displayed and 
printed information:   
 
;
 
Unused, non-connected inputs and outputs will have an indeterminate state and 
assume a value of 1 or 0. 
 
 
Indicators: Sampled every millisecond, incoming (IN) and outgoing (OUT) signal 
activity can be observed on the card, where LED color changes correspond to signal 
state changes. 
 
Signal Out
Signal In
 
 
 
Input Monitors: Binary input signal states can be viewed (see Section 4.2.6, TEST 
GPIO / MONITOR GPIO INPUT) in the following format: 
 
 
 
 
SOP           FEED              PAUSE           REPRT 
1                  1                      0                      0 
 
i1            i2            i3           i4            i5             i6 
0             1             0            1             1              1
 
 
 
Output Monitors: Binary output signal states can be viewed (see Section 4.2.6, TEST 
GPIO / MONITOR GPIO OUTPUT) in the following format: 
 
 
 
EP       RL       SR       MO       RO       DR       OF 
0           0          0          0           0           0          0 
 
o1         o2         o3         o4          o5           o6 
0           0           0           0            0             0