XB24 and XB24-DM congifuration does not work !

Hello,

My aim is to have 2 transmitters sending serial data to receiver
connected to PC via Xbee Explorer board.
I am using XBee “Series 1” modules.

My setup is as follows:
Arduino (AD) powered using USB and XBee (XB) attached to self-made shield (powered using AD_3V3).

I am using NewSoftSerial library for communication at 9600 baud rate
to avoid interference with FTDI.

So, i have attached the XBeeDIN pin to FD3 pin.

My XB’s configuration tested till now:
(Just point to point to test)

XBeeTX: DL-1, MY-2 (Arduino)
XBeeRX: DL-2, MY-1 (PC)
(PAN-3332, BD-9600)

XBeeU: DL-1, MY-2 (Arduino)
XBeeD: DL-2, MY-1, CE-1 (PC)
(PAN-3332, BD-9600)

Both the above configuration are “not working”.

So, i changed the firmware to XB24-DM (XBee Digimesh)
and configured them as follows:

Receiver
PAN-1234
SH-13A200
SL-4064036E
DH-0
DL-FFFF

Transmitter
PAN-1234
DH-13A200
DL-4064036E

And surprisingly it does not work too.

In order to confirm whether my hardware is working or not-
I tested it with my Series2 modules lying around.
And the setup works with them.

Please help me to debug this.

Regards-
Aadeesh