2050
User Guide
CAN Bus/Event
The 2050M also employs
CAN Bus
technology.
CAN
bus is a balanced (differential) 2-wire
interface, and is ISO11898 -24V compliant. The
CAN
interface uses an asynchronous
transmission scheme. This interface employs a serial binary interchange and is widely used
in the automotive industry. The data rate for the 2050M
CAN Bus
is defined as 250K
bps
maximum. Termination resistors are used at each end of the cable. This port/connector is
shared with the
Even
t Input.
The 2050M also can utilize an event input. This input pulse can be used to synchronize any
external incident that requires precise
GPS
time tagging, such as aerial photography. The
action of a camera’s aperture could send a pulse to the
Event
port of the 2050M and have it
output position information relative to the time the photograph was taken. It requires input
impedance of 50 Ohms, a minimum High Level Input of 2.5V, and a minimum Low Level
Input of 1.2V. The propagation delay is less than 100nsec. The Event Input latch can be
configured to sync on the rising, or falling edge of the event input pulse by using the
appropriate NCT proprietary command. Connecting the shared EVT MKR/CAN BUS port
requires a five core 5mm diameter cable fitted with a
LEMO
plug type
FGG.0K.305.CLAC50Z plus strain relief. This is available as C&C P/N 4250007-3.
LEMO
Pins
Signal Name
1 EVENT
LO
2 EVENT
HI
3 GND
4 CAN
HI
5 CAN
LO
Table 6:
Event and CAN Bus Connector
2-13
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