Trimble Inc. CCKCDPD Benutzerhandbuch
2 Installation
4 2 CrossCheck CDPD Mobile Unit Manual
2.9.8
Outputs (XP0 to XP2)
The CrossCheck CDPD features three discrete outputs (XP0–XP2) for
driving external devices such as relays.
driving external devices such as relays.
•
When inactive (use state), the discrete outputs are tied to vehicle
battery voltage (nominally 12 VDC) through a 15 kOhm
resistor.
battery voltage (nominally 12 VDC) through a 15 kOhm
resistor.
•
When active, the outputs are shorted to ground through a
bipolar junction transistor. In the active (low) state, the outputs
can sink up to 200 mA.
bipolar junction transistor. In the active (low) state, the outputs
can sink up to 200 mA.
Figure 2.21 shows a diagram of a discrete output.
Figure 2.21
Output Circuit Diagram
Output Inactive:
15 kOhms through V
vehicle-battery
Output Active:
Tied to ground through a saturated bipolar
junction transistor, V
junction transistor, V
out
1.5 VDC at
200 mA; V
out
< 0.5 VDC at
10 mA
Output Protection:
Protected against direct shorts to ground
Output Sink Current
Capability
Capability
Up to 200 mA
15K
36V
0.01µF
0.2A
470pf
Output
Vbatt