User`s guide

Getting Star ted with RTDX™

num_of_msgs should be zero. Using this process to check the amount of

data can m ake your reads more reliable by letting you or your program

know how much data to e xpect.

6 Type the following to verify that your read channel ochan is enabled for

communications.

cc.rtdx.isenabled('ochan')

You should get back ans = 0 — you have not enabled the channel yet.

7 Now enable and verify ’ochan’.

cc.rtdx.enable('ochan');

cc.rtdx.isenabled('ochan')

To show that ochan is ready, MATLAB software responds ans=1.Ifnot,

try enabling

ochan again.

8 Type

pause(5);

The pause function gives the processor extra time to process the data in

indata and transfer the data to the buffer you conﬁgured for ochan.

9 Repeat the check for the number of messages in the queue. There should be

20 messages available in the buffer.

num_of_msgs = cc.rtdx.msgcount('ochan')

With num_of_msgs = 20, you could use a looping structure to read the

messages from the queue in to MATL AB software. In the next few steps of

this tutorial you read data from the

ochan queuetodifferentdataformats

within MATLAB software.

10 Read one message from the queue into variable outdata.

outdata = cc.rtdx.readmsg('ochan','int16')

outdata =

2-35