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 57600. 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 11.11 in the FAQ. For further assistance, refer to the
"Troubleshooting"
section 5.0 of this manual.
4.0 Activating The Modem
After issuing the
AT
command to verify communication with the modem, you are ready
to initiate the air link connection with the cellular 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.
4.1 Over-the -Air Provisioning
The CDM series supports the 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. To perform Over-the-Air Service
Provisioning, type:
AT+CDV*22899
†
After issuing the
AT+CDV*22899
†
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. To make a circuit-switched connection, type this
command:
ATD
<phone number to call>
.
If the modem did not properly dial the phone number you specified, here are a few things
to check:
