Yaoming,
I went ahead and forwarded your question to R&S. Here is what they had to say:
Hello Jennifer,
Thank you for forwardng this message to us.
We are very concerned about this customer's perception of our support, and
would like to work together with you to restore their faith in Rohde &
Schwarz support. Rohde & Schwarz has a strong committment to customer
satisfaction, and messages like this are very troubling to us.
I am hoping that their previous bad experience was before last June, when
Rohde & Schwarz began supporting our own products in the USA. ( Before
then, our US support was handled by Tektronix.)
Would it be possible to have the customer's contact information for our
records? We will not contact the customer unless you tell us to.
Here is the answer to the question:
There is no command to change the "Main Service" mode. This is because the
service mode is set by making a connection to the mobile phone.
You can, however, query the CMU to determine what "Main Service" mode is
active, after the connection is made.
Here is the section from the CMU GSM manual that explains this:
(Embedded image moved to file: pic15573.jpg)
And here is the section showing an example of making a "Circuit Switched"
connection:
(Embedded image moved to file: pic05097.jpg)
Likewise, there is a similar command to setup a "Packet Data" connection:
(Embedded image moved to file: pic16512.jpg)
So, if using the LabView CMU200 driver, the vi to make a connection is :
RSCMU_GSM_Sig_ProcSignAct
