Urgent! unable to receive complete cheque information from my cheque reader.

I've got a problem here. Actually i have done a program thats use to test the connection, sending and retrieving of data from external peripherial like the cheque reader.

Previously the program was running smooth but recently we migration e program to a new computer which has a faster processor(P4). After this migration, my program could still work using comm port 2 but when i change to port 6 only last 3 number of the cheque would appear in my application when i slot in my cheque in e cheque reader. The numbers in front disappeared.

Does this have any thing to do with the difference in speed of the new pc or the mscomm property "handshaking"?
How can i solve this problem?

Hi my dear friends.
I have already found a solution for question.
Every cheque has 27 character cheque number so you just have to set its Rthreshold to 27 then everything would be fine. That means the cheque reader will read and return 27 characters. In this case no data will be lost.
Hope this solution will be able to help someone facing the same problem as me.