VXI user manual 12 VT1536A Isolated Digital Input/Output SCP

Choose a value from the “Minimum Period” column in Table 2 that is longer than your input signal’s undesired transition period when you want to exclude these short term input signal transitions.

Choose a value from the “Maximum Period” column in Table 2 that is shorter than your input signal’s expected transition period when you want to be certain to include these desired input signal transitions.

The values to send to the VT1536A are in the “Nominal” column in Table 2 below.

Table 2 Nominal Debounce Period and Uncertainties

Minimum Period	Nominal Value	Maximum Period
debounce off	0	debounce off
0.08 ms	0.15 ms	0.18 ms
0.20 ms	0.30 ms	0.35 ms
0.45 ms	0.60 ms	0.65 ms
0.95 ms	1.20 ms	1.30 ms
1.90 ms	2.40 ms	2.50 ms
4.10 ms	4.80 ms	5.00 ms
8.20 ms	9.60 ms	9.85 ms
16.4 ms	19.2 ms	19.7 ms
32.8 ms	38.4 ms	39.4 ms
65.5 ms	76.6 ms	78.7 ms
131 ms	153.6 ms	158 ms
262 ms	307.2 ms	315 ms
525 ms	614.4 ms	630 ms
1.05 s	1.2288 s	1.26 s
2.10 s	2.4576 s	2.52 s

--Sending 0 or MIN turns debounce off. Sending MAX selects 2.458 seconds.

--If a value is sent that is slightly greater than one of these values, the next higher value (or MAX) is selected. Values outside of the range 0 - 2.4576 will generate the error -222, "Data out of range".

•<ch_list> must contain all 4 of the upper-bank channels, or all 4 of the lower-bank channels, or all 8 channels for a given SCP. This is because the VT1536A has two debounce timers, one for its lower 4 channels and one for its upper 4 channels.

12 VT1536A Isolated Digital Input/Output SCP