Hello all...new member here:The setup is this: We're communication to a Freescale (MC568037EVM) eval board from a PC, using Visual Basic through the serial port to a USB server (the Freescale board is USB). The problem is that it takes a very long time for the card to see the sata (not very much data, at that). The COM port on the PC (in VB) is set at 256K, the card is set to 256K... we have to set the SiLabs driver at 9600 or most of the data never makes it to the card. We're sending the data sequentially...average string is 72 characters long, and average SEND package is not more than 100 or so strings. THIS TAKES ANYWHERE FROM 2O-40 SECONDS before the other card sees it! Seems to be a USB driver issue, but we're stumped.Any ideas how we can speed this thing up?Thanks in advance,Garry

 

I think problem lies at the com port. Serial port uses approximately ±12V to ±25V. So this might fry logic's.
Any ways they are not fast enuf and further more you have to change serial port voltage to the appropriate logic levels, since you said it is USB

*****
Rifaa