Section 13: Model 3750 multifunction control card
Series 3700A Switch and Control Cards Reference Manual
13-4
3700AS-909-01 Rev. B / December 2011
Model 3750 additional information
Digital I/O
CAUTION
Do not exceed the maximum rated voltages and currents for the digital I/O banks. Do not apply
negative voltages to any of the inputs. Unused inputs should not be left floating, but should be tied to
either a ground or a positive DC voltage.
The Model 3750 offers 40 digital I/O bits arranged in 5 banks. Each bank is referenced as a channel
from 1 through 5. The 8 bits in each bank or channel can be programmed as either input or output.
Additional features include scanning capabilities, such as writing a unique output pattern or reading
inputs as part of a scan. Also, pattern matching is available that supports generating events that can
then be used for triggering system events, such as starting a scan.
Simplified jumper configuration model
Digital outputs can be jumpered to either an in5 V or an external voltage. The diagram below
shows a simplified schematic.
Figure: Simplified schematic of the jumper configuration
Figure 67: Simplified schematic of the jumper configuration