help on sim.c

Hello all, I am using osmocomm (branch sylvain) on a motorola C140. I have uncommented the line "#define DEBUG" on src/target/firmware/calypso/sim.c and recompiled. I have connected an interface between my PC and phone sim slot ( a pl2303 usb module, with a diode between TXD and RXD and a 22K resistor between +5V and RXD). Now I have opened the serial port on my PC with these settings: baud rate = 9600 databits = 8 parity = even stopbits = 2 and I am sending the byte "3B" to the phone, but I see in osmocon console: "SIM-ISR:  Waiting for read (9B)..." (id est the phone seems like to receive "9B" instead of "3B"), where I am wrong?