replay

Retransmit messages from CAN bus

Syntax

replay(canch,message)

Description

replay(canch,message) retransmits the message or messages message on the channel canch, based on the relative differences of their timestamps. The replay function also replays messages from MATLAB^® to Simulink^®.

To understand the elements of a message, refer to canMessage.

Examples

Replay Messages on CAN Channel

Use a loopback connection between two channels, so that:

• The first channel transmits messages 2 seconds apart.

• The second channel receives them.

• The replay function retransmits the messages with the original delay.

The timestamp differentials between messages in the two receive arrays, msgRx1 and msgRx2, are equal.

ch1 = canChannel('Vector','CANcaseXL 1',1);
ch2 = canChannel('Vector','CANcaseXL 1',2);
start(ch1)
start(ch2)
msgTx1 = canMessage(500,false,8);
msgTx2 = canMessage(750,false,8);

% The first channel transmits messages 2 seconds apart.
transmit(ch1,msgTx1)
pause(2)
transmit(ch1,msgTx2)
%The second channel receives them
msgRx1 = receive(ch2,Inf);

% The replay function retransmits the messages with the original delay.
replay(ch2,msgRx1)
pause(2)
msgRx2 = receive(ch1,Inf);

Input Arguments

canch — CAN device channel

CAN channel object

CAN device channel, specified as a CAN channel object, on which to retransmit.

Example: canChannel('NI','CAN1')

message — Messages to replay

array of message objects

Messages to replay, specified as an array of message objects.