Configuration of the CAN-CBM-Bridge/2
Bn:HexIndex
By means of the command
Bn:
you can configure the desired bit rate of the
CAN net with net number
n
, with:
n
= 0
for net 0
n
= 1
for net 1
If values between 0 to 0xF are specified for
HexIndex
, the bit rate is configured
according to the following table:
HexIndex
Bit rate [kbit/s]
HexIndex
Bit rate [kbit/s]
0
1000
8
66.6
1
666.6
9
50
2
500
0xA
33.3
3
333.3
0xB
20
4
250
0xC
12.5
5
166
0xD
10
6
125
0xE
reserved
7
100
0xF
reserved
Table 8:
Index of bit rate
In the following example the bit rate of net 1 (
n
=1) is to be configured to
10 kbit/s. From Table 8 you get the
HexIndex
= 0xD. Your input therefore is as
follows:
Input:
B1:D
>Enter<
Bn:8000yyzz
Alternatively you can configure the bit-timing register of the MB90F543
component used, directly. In this case the register value for the bit-timing
registers BTR0 and BTR1 is specified directly.
Here is:
n
:
0 ,1... net number
yy
:
value for BTR0
zz
:
value for BTR1
Please refer to the manuals of the controller MB90F543 for the correct way to
determine the bit timing and the bit rate from the register values.
The manual can e.g. be downloaded from the Cypress homepage:
Search for 'MB90540 Series' Hardware Manual.
Page 20 of 41
Hardware Manual • Doc. No.: C.2853.21 / Rev. 1.4
CAN-CBM-Bridge/2