COM port time out, but can read back data from MAX

[colinzhang]

When short RX and RX directly, COM port can feedback data on MAX test panel, but always display "time out" error. What's the possible reason? Thanks. 

[ASEAN · Accepted solution]

Hi Colin, 

When you read back the data, there is a parameter called "Bytes to read" you need to key in, the default value is 1024, in this case, it will keep waiting for 1024 bytes until the timeout occur.

I found a good article talking about this and you can change the bytes to read in the LabVIEW environment or MAX test panel.

http://digital.ni.com/public.nsf/allkb/874B379E24C0A0D686256FCF007A6EA0

Do let me know after you try it out, thanks.

Regards,

KwokHow

AE NI Singapore

[crossrulz]

If you leave the default port settings, then you can use a termination character to stop the read.  By default, it is 0xA (line feed).  So if you addend a line feed to your sent data, then it will work much better.

[colinzhang]

Hi Asean,

Thanks your reply, this issue has been resolved. You are right.

[colinzhang]

Thanks for your reply, your info is useful as well.