Chengdu Ebyte Electronic Technology Co., Ltd.
E810-TTL-CAN01 User Manual
Co
Copyright ©2012–2019
，
Chengdu Ebyte Electronic Technology Co., Ltd.
7
4.3 Transparent conversion
Transparent conversion: The converter converts the bus data of one format to the data format of another bus as it
is, without adding data or modifying it. The data format is exchanged without changing the data content. For the bus
at both ends, the converter is like "transparent".
The E810-TTL-CAN01 module can convert the valid data received by the CAN bus to the UART, and the
UART outputs the same data. Similarly, the module can also convert the data received by the UART to the CAN bus,
and realize transparent conversion between UART and CAN.
4.3.1 Frames in UART converts to CAN message
All data in the UART frames is sequentially filled into the data field of the CAN message frame. The converter
receives and converts as soon as it detects that there is data on the serial bus.The frame type and frame ID of the
converted CAN message come from the user's prior configuration, and the frame type and frame ID remain
unchanged during the conversion process. The corresponding format of data conversion is shown as below.
If the received serial frame length is less than or equal to 8 bytes, the characters 1 to n (n is the serial frame
length) are sequentially filled into the 1 to n byte position of the data field of the CAN message (as shown in the
figure, n is 7).
If the frame length is greater than 8, starting from the first character of the serial frame, for the first time the
processor takes 8 characters to fill the data field of the CAN message in turn; after the data is sent to the CAN bus, the
conversion is performed. The remaining serial frame data is filled into the data field of the CAN message until its data
is completely converted.
