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Curtis 1220 Manual, Rev. C
2 — INSTALLATION & WIRING: I/O Signal Specifications
INPUT/OUTPUT SIGNAL SPECIFICATIONS
e electrical characteristics of the input/output signals wired to the J1, J2,
and J3 connectors are described below.
KSI (pin J1-5)
e keyswitch (KSI) must be connected to B+ via a switch. is pin feeds the
internal power supply and can be used for general on/o and for the power
supply to the Fault Output pin.
Input current at Nominal Battery Voltage (50 – 200 mA) + Fault Output current
Digital inputs (pins J1-4 and J3-2)
e digital inputs must be connected to B+ via a switch, or they can be driven
by outputs from other systems.
Input current at Nominal Battery Voltage approx. 0.2 – 0.7 mA (depending on
nominal battery voltage
Input filter R-C time constant max 5 ms
Max LOW threshold voltage 5.0 V
Min HIGH threshold voltage 12 V
De-bouncing time (in software) 10 – 25 ms
Analog inputs (pins J1-3, J1-6, J1-11, J1-13)
e analog inputs are used for analog input commands from any analog input
device, e.g., potentiometer, Hall sensor.
Input resistance (to B- ground) 50 kΩ ± 10%
Input current (wheel in center position) max 100 μA ± 10%
Input filter R-C time constant max 5 ms
Voltage range 0 – 5.5 V
Minimum resolution 12 bit
Steer Motor Encoder inputs (pins J1-2, J1-9)
ese inputs are used for the A and B signals of the Steer Motor Encoder device.
Input current (to Encoder Ground) 1.5 mA ± 20%
Input filter R-C time constant 1 μs
Max LOW threshold voltage 0.5 V
Min HIGH threshold voltage 2 V
+5V Supply (pin J1-7)
is pin is the power supply connection to the Command Input Device and
the Position Feedback Device.
Command supply voltage +5 V ± 10%
Maximum current draw 70 mA
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