11.6 Pulse measurement specifications
The data logger can measure switch closure or high-frequency pulse signals on C and U
terminals. Terminals are configured as pairs with options for pull-up or pull-down. Even-
numbered U terminals can be configured as low-level AC inputs. See also Digital input/output
specifications (p. 222). Each terminal has its own independent 32-bit counter. Terminal pairs are
U1 and U2, U3 and U4, through U11 and U12.
NOTE:
Conflicts can occur when a control port pair is used for different instructions (TimerInput
(), PulseCount(), SDI12Recorder(), WaitDigTrig()). For example, if C1 is used
for SDI12Recorder(), C2 cannot be used for TimerInput(), PulseCount(), or
WaitDigTrig().
Pulse Event: Transition from logic low to logic high.
Terminal Pair Configuration Logic Low Logic High
5 V ≤ 1.5 V ≥ 3.5 V
3.3 V ≤ 0.8 V ≥ 2.0 V
Maximum Input Voltage: ±20 VDC
Maximum Counts Per Channel: 2
32
Maximum Counts Per Scan: 2
32
Input Resistance: 5 kΩ
Accuracy: ±(0.02% of reading + 1/scan)
11.6.1 Switch closure input
Terminals: C1-C4, U1-U12
Resistance: Configurable in terminal pairs with 100 kΩ pull-up or pull-down
Maximum Input Frequency: 150 Hz
Minimum Switch Closed Time: 5 ms
Minimum Switch Open Time: 6 ms
Maximum Bounce Time: 1 ms open without being counted
Software Debounce Time: 3.3 ms
11. CR6 Specifications 221
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