User Manual

A
Specifications
70
CrossCheck CDPD Mobile Unit Manual
Table A.13 Discrete Inputs: IP0 to IP3
Item Specification
Input Logic High Open circuit or V
in
> 2.4 VDC
Input Logic Low V
in
< 0.6 VDC
The inputs must remain in either state for at least
500 milliseconds before the CrossCheck CDPD detects
the input.
Input Current I
in
± 3 mA
Input Protection Protected up to at least V
Batt
continuous
Table A.14 Pulse Counter Inputs
Item Specification
Input Logic High Open circuit or V
in
> 2.4 VDC
Input Logic Low V
in
< 0.6 VDC
Input Current I
in
±3 mA
Minimum Pulse Width 500 microseconds
Input Protection Protected up to at least V
Batt
continuous
Table A.15 Discrete Outputs: XP0 to XP2
Item Specification
Output Inactive 15 KΩ tied to V
vehicle-battery
V
out
depending on load
Output Active Tied to ground through a saturated bipolar junction
transistor, V
out
< 1.5 VDC @ 200 mA;
V
out
< 0.5 VDC @ 10 mA
Output Sink Current Capability Up to 200 mA
Output Protection Protected against shorts to ground