HMS IXXAT CANbridge, Руководство пользователя, Страница: 16 / 30

Configuration 14 (28)
6.2.4 Adjusting the CAN Bus Settings
[CANBus1],[CANBus2]
Settings can be adjusted for CAN 1 and CAN 2 separately.
Baud Rate
Parameter Description
BaudRate = Auto
Automatic baud rate detection activated, for more
information see
Automatic Baud Rate Detection, p. 14 )
BaudRate = <CiA baud-rate>
Set predefined CiA baud rate. The following values (in
kBit/s) are possible: 20, 50, 100, 125, 250, 800, 1000
BaudRate = <BTR0/BTR1>
Set baud rate via bus timing register, for more information
see
Setting of Bus Timing Register, p. 14
Automatic Baud Rate Detection
Automatic baud rate detection is exclusively possible if at least two nodes per bus are
active.
Possible Baud Rates
Baud rate (CiA) BTR0 (hex) BTR1 (hex)
1000 kBit/s
0x00 0x14
800 kBit/s 0x00 0x16
500 kBit/s
0x00 0x1C
250 kBit/s
0x01 0x1C
125 kBit/s
0x03 0x1C
100 kBit/s
0x04 0x1C
50 kBit/s
0x09 0x1C
20 kBit/s
0x18 0x1C
It is possible to set a timeout for the automatic baud rate detection (see Autobaud Timeout
Detection, p. 13 ). For information about automatic baud rate detection sequence indicated by
LEDs see Automatic Baud Rate Detection Sequence, p. 20 .
Setting of Bus Timing Register
HMS Industrial Networks recommends using the predefined standard baud rates. If user defined baud
rates are used, make sure that the entered values are valid.
If the baud rate is set with the bit timing register BTR0 and BTR1 of the controller, baud rates
that are not defined by CiA can be used.
Values for the bit timing register BTR0 and BTR1 are determined according to the specifications
for the CAN controller SJA 1000 with 16 MHz clock frequency (for more information see
datasheet of SJA 1000).
Example
For 200 kBit/s:
BaudRate = 0x04/0x14
CANbridge User Manual
4.01.0120.20000 2.1 en-US