ATPK command giving error

I am using 24Xstream rf modem. I am able to communicate with the modem through AT commands.
But, when I send ATPK command (to change the buffer size of DI buffer of RF modem), it is giving me error.

+++ //enter command mode
ATPK 100\r
ATRB 100\r
>OK //exit command mode

Does anyone here know about this? Please help me… [:(]

I m not sure about this, create an Online support request at the following link, , digi folks will help you.

If your problem is already solved please update the forum.