Might be possible that clcok tolerance between parts
might be an issue. The note for PSOC 1, general
http://www.cypress.com/?app=forum&id=2492&rID=89624 UART Baud Rate
http://www.cypress.com/?rID=39848 UART Baud Rate PSOC 1
The =-042 kit relies on internal clocks, consult respective
datasheet for clock accuracy in your calculations. PSOC 4 and
You did indeed configure the PSoC5 UART to the same data rate as you are using for sending? Did you use an internal clock?
On the PSoC4 side, are you using a SCB or UDB based UART? The SCB-based component tells you the real data rate in its config dialog, check that its what you intended to set (its calculated from the external clock and the config)