I-7530, I-7530A, I-7565, I-7530-FT, tM-7530, tM-7530A, tM-7565 User Manual Version 1.6
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3.3 CAN setting
＊
CAN specification:
Use the CAN specification CAN 2.0A (11-bit CAN ID) or CAN
2.0B (29-bit CAN ID).
＊
CAN baud rate:
Set the CAN baud rate, which can support 10K, 20K, 50K, 125K,
250K, 500K, 800K, 1000K and 83.3K bps. If these baud rates cannot meet the
user's needs, and the special baud rates can be set th rough the "User-defined CAN
baud rate" function.
＊
User Defined CAN Baud Rate:
When using the user-defined CAN baud rate, the
user needs to fill in the value of the CAN baud rate in the "Required Baud Rate"
field, and click the "Calculated" button to calculate the "Real Baud Rate". When the
calculated real baud rate and the required baud rate are different, it means that the
required baud rate cannot be calculated due to hardware limitations, so the "Real
Baud Rate" field will display the actual closest and can support The CAN baud rate.
As below figure, the required baud rate is 720 00bps, but the calculated real baud
rate that can be supported is 71428bps.
If the user want to get more information about the real baud rate, please click the
"Advanced" button and select the appropriate real baud rate to suit the application as
beolw figure. Among them, the field of Sample Point refers to in the CAN message,
when the time width of a bit is defined as 0~100% from the start point to the end point,
the sample point is which position within this time width. For example: 87.5% means
that the sample point is in the 87.5% position of 0~100%. In addition, SJW is the setting
for adjusting the amplitude of the sample point, which is usually used to solve the
problem of oscillator phase offset between different CAN devices, and ensure the CAN
device can receive correct CAN messages. In general, the commonly used sample point
and SJW are 87.5% and 1.
