Principle Of Can Bus - Raytheon STD 21 GPS Operation Manual

General principle of CAN bus
1.2
(CAN = Controller Area Network)
Gyro compass
Gyro compass
259.8
= terminating resistor
Figure 2:
Edition: Feb. 05, 2007
Satellite Compass
STD 21 GPS
Operator Unit
8 x heading
(course bus
or NMEA)
3 x step
1x courseprinter
1 x rate of turn
DV Bus
General principle of CAN bus technology
STD 21 GPS
The CAN bus is a multi-master bus allow-
ing the connection of all devices and sys-
tems regardless of their task and function.
This means that any number of devices
can be connected. These devices must
be designed for CAN bus technology.
It is essential that every CAN bus user is
addressable via a unique address. This
address is set within each bus user.
The usable address range is from 01
3F (address 00
(16)
opment purposes).
Each bus user can send and receive data
via the CAN bus.
The CAN bus must be terminated at both
ends via an ohmic resistor (125 ohms).
This terminating resistor is activated by
jumpers on the respective printed circuit
board (PCB).
There are 2 redundant bus systems
(CAN1 and CAN2).
The maximum length of a CAN bus
cabling must not be longer than 300
meters!!!
3
STD 21 GPS
(16)
is reserved for devel-
(16)
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