Good day. Thank you for your question.
Yes, it is possible to send GPRS commands from your platform (installed on your PC). Please see below on the SMS command structure (for FMB120):
With login and password : <login><space><password><space>setparam 2001:yourAPN;2005:yourPORT
Without login and password : <space><space>setparam 2001:yourAPN;2005:yourPORT
If you are sending via the GPRS command then you may skip the login, password, and <space>.
Please try this out and let me know if it helps.