Campbell CR6 - Switch Closure Input; High-Frequency Input; Edge Timing

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().
Maximum Input Voltage: ±20 V
Logic Levels and Drive Current:
Terminal Pair Configuration 5 V Source 3.3 V Source
Logic low ≤ 1.5 V ≤ 0.8 V
Logic high ≥ 3.5 V ≥ 2.5 V
C1 - C4 10 mA @ 3.5V 10 mA @ 1.85V
U odd 20 mA @ 3.5V 20 mA @ 1.85V
U even 10 mA @ 3.5V 10 mA @ 1.85V
11.7.1 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
11.7.2 High-frequency input
Terminals: C1-C4, U1-U12
Resistance: Configurable in terminal pairs with 100 kΩ pull-up or pull-down
Typical Wave Form: 5 or 3.3 VDC square wave
Maximum Input Frequency: 1 MHz
11.7.3 Edge timing
Terminals:C1-C4, U1-U12
11. CR6 Specifications 223