can we use large memory model variables in Evaluation Keil

I want to interface device which communicate through serial communication with uC.
I checked this device using serial port analyzer it is responding but when i am giving that commands using uC it is not responding.
show your code

if i am accessing memory of that device then i have to use xdata variables so i have to use large memory model thats why i am asking can we use it.

why? what does the memory of another device have to do with the memory you use for the '51? Also you do not need the large memory model to use xdata

Erik

I want to interface device which communicate through serial communication with uC.
I checked this device using serial port analyzer it is responding but when i am giving that commands using uC it is not responding.
show your code

if i am accessing memory of that device then i have to use xdata variables so i have to use large memory model thats why i am asking can we use it.

why? what does the memory of another device have to do with the memory you use for the '51? Also you do not need the large memory model to use xdata

Erik