Switch Closure on C Terminal:
12 Vdc Pull-Up
Open Collector on C Terminal:
12 Vdc pull-up
Internal CR1000 circuitry that supports open-collector
and switch-closure measurements (FYI)
• Pay attention to specifications. Take time to understand the signal to be
measured and compatible input terminals and CRBasic instructions. The
table Three Differing Specifications Between P and C Terminals
(p. 358)
compares specifications for pulse-input terminals to emphasize the need for
matching the proper device to the application.
Table 81. Three Specifications Differing Between P and C Terminals
P Terminal C Terminal
High-Frequency
Maximum
250 kHz 400 kHz
Input Voltage
Maximum
20 Vdc 16 Vdc
State Transition
Thresholds
Count upon transition from
<0.9 Vdc to >2.2 Vdc
Count upon transition from
<1.2 Vdc to >3.8 Vdc
358
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