EM4001 RF Card Reader based on Access Control System

2)---- i didn't skip or remove any code. than the first 2 bytes all became digital 0.
-------i am sure i used hyperterminal as well!

Morris

This may be a language thing, but you must know if you used Hyperterminal or not.

In case 2 did you send "ABCDEFGHIJKLMNO" .
Don't forget Hyperterminal can't display hex values such as 0x00, 0x01,0x02,0x03

Oh,Sorry. i didn't remove all code. i didn't tell a lie that i may be too dizzy
I put the card number into the buffer.Only in this way can I receive the error information.
wait please... i will attach screenshots...and will tell you the error detail...

Sorry,ExperimenterUK. I have already corrected my mistakes.
I have almost taken a whole night to do the testing work, due to i have never recorded the relevant information before.
It is no way to get a previous error status.
But the testing result can explain the error.
Please find the screenshots as below.

Morris you have to upload the screenshots to put them in IMG tag.

you can use tinypic.com to upload your images.