microcom on mini2440

>I am trying to use microcom on mini2440
>pc and mini2440 board are connected with serial cable
>On pc I have opened minicom with baudrate as 115200 and device as
/dev/ttySAC0
>On mini2440 I have opened terminal and typed following command
microcom -s 115200 /dev/ttySAC0
>now on mini2440 if I am pressing any character it appears on pc terminal
so I thing tx pin of mini2440 is working fine
>Now I am trying to test reverse way i.e. when I press character on pc same
character should appear on mini2440 terminal but its not happening
>I shorted pin2 and pin3 of DB9 connector and typed same command on
mini2440 terminal to receive same characters but nothing appears on
terminal
>Does that mean there is any problem on rx side on mini2440 while using
microcom or am I doing anything wrong while testing uart on microcom

>Some of board details are as below
NAND Fash  = K9F1G08U0B (128M x 8 Bit)
NOR Flash  = S29AL016J16 (2 M x 8-Bit/1 M x 16-Bit)
SDRAM      = H57V2562GTR (16M x 16) 

>how can i recieve data correctly ????
>any help on this topic will be useful


thank you

"On pc I have opened minicom with baudrate as 115200 and device as
/dev/ttySAC0"

I guess your PC has no "/dev/ttySAC0" device node.

i am sorry that's a typing mistake
i have used /dev/ttyS0 on pc

>On mini2440 I have shorted rx and tx of CON2 and typed following command
in terminal of mini2440
   microcom -s 115200 /dev/ttySAC1

>whatever I am typing using keyboard same is appearing on terminal i.e.tx
is sending data to rx pin so I guess serial port rx tx short test is
working for me.

>Same is happening for CON3 with /dev/ttySAC2

>this test doesn't work for CON1 for /dev/ttySAC0
I think because ttySAC0 is by default used for console 

>forum discussions have helped me a lot in solving problems like this



thank you