The HyperTerminal connection should now be active. As a test, we'll send the standard attention
code to the modem. Type the command:
AT
and press enter. If properly interfaced with the
modem, you should receive an OK reply. If not, make certain that the modem's power LED is
illuminated and the bit rate of your terminal emulation software is set to 115200. For most
applications, you should be using a standard RS-232 straight cable. To check if you need a Null
Modem cable, view the
"When Do I Need A Null Modem Cable?"
section 7.11 in the FAQ. For
further assistance, refer to the
"Troubleshooting"
section 6.0 of this manual.
3 Activating The Modem
After issuing “
AT”
commands to verify communication with the modem, you are ready to initiate
the cellular connection with the cell tower. Before the modem is able to place or receive calls,
you must subscribe to a cellular provider. When subscribing to their service, you will be asked for
the Electronic Serial Number (ESN) of the unit. This number is printed on the data label affixed
to the modem. The number is available either in decimal or hexadecimal format. You may also
query the ESN directly from the modem by opening your terminal emulation software and issuing
the following command:
AT+GSN
This command will return the ESN in hexadecimal format.
+GSN: 45263A2F.
Once your account has been activated, you have to provision the modem for
operations. Each Cellular Carrier supports different methods for activating a modem, some
require that you manually program the assigned number into the modem and some support Over-
the-Air Service Provisioning (OTASP). OTASP configures the modem for operation with their
cellular network. The process is described below; please see the
Appendix
for information
specific to your Carrier on how to activate your modem.
3.1 Over-the-Air Provisioning
The CDM-819s supports the cellular service provisioning features called Over-the-Air Service
Provisioning (OTASP) and Over-the-Air Parameter Administration (OTAPA). OTASP occurs
when a user initiates a call to the service provider. No further commands are required to provision
the modem. For example, a user who gets a new modem/phone without any service programming
data can call the service provider's special OTASP number to have the device programmed
without physically taking it to the service provider.
OTAPA occurs when the network initiates a call to the modem and programs it without any user
intervention. OTAPA is typically used when the service provider decides to update information
on many cellular devices at the same time.
After the modem’s serial number is authorized for use with a cellular provider, you may activate
the modem over the cellular network if your carrier supports it. Please see the
Appendix
for
information specific to your Carrier.
After issuing the OTASP command, your cellular provider will program the proper roaming
parameters into the modem. Please allow approximately four minutes for this to occur. After
waiting the appropriate amount of time for the cellular network to program the modem, perform a
power cycle by removing the DC power supply plug and reconnecting it. To test that OTASP has
taken place, type:
AT+CDV
<phone number to call> from your terminal emulation software.
If this is successful, the modem will place an outbound call through the cellular network to the
phone number specified. The phone will ring and call display will show the phone number of
your modem.
4 Placing Calls
Use the procedures below to place outbound circuit-switched and packet data calls to other
