Figure 3-2 8-Position Response Switch - Keithley PDISO-8 User Manual

Setting the Response Switch
3-10
The address you specify must be within the range of 200 to 3FCh (512 to
1020 decimal) and on a 4-byte boundary.
Continue with the next procedure, "Setting the Response Switch."
Each digital input channel includes a switchable, single-pole, RC filter
with a time constant of 5ms. The response switch contains a separate
position for each of the digital input channels, allowing you to switch the
filters individually in or out. Refer to Figure 3-2 to see which response
switch positions correspond to which digital channel.
7 6 5 4 3
O
N
1 2 3 4 5
Figure 3-2. 8-Position Response Switch
Switch positions are marked on the switch while corresponding
Note:
input-channel numbers (corresponding to channel numbers IP0 to IP7) are
marked on the board and just above the switch.
If you are using AC input signals for certain channels, you must set the
filter switch to ON for each of those channels. A channel filter fills in the
portions of time that the AC input is at or close to zero voltage, putting the
signal read from the board at a continuous logic high when the input is
energized.
If you are using DC input signals, use of the filter is optional. If you
require a fast response (less than 50µs), turn the filter off. If you want a
slow response (about 5 to 10ms) for rejecting spurious noise or contact
bouncing, turn the filter on.
2 1 0 Input Channel Numbers (IP0 to IP7)
Setting a switch position to ON turns
the filter on.
6 7 8
Installation