CalAmp SMC-CDMA Series, Руководство пользователя

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001-0004-819 Rev01
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This section provides information on various features and call scienerios using the SMC-CDMA
modem with the SMC Development/Test board and HyperTerminal. The SMC-CDMA modem
integrates Telit’s MOT-C24 cell module and uses it’s serial UART interface.
See related document, MOT by Telit C24 Developer’s Guide, AT Commands Reference Manual
[1] for
more detailed descriptions and examples for all features and call types.
Types of calls and features:
1x Packet Data
Circuit Switched Data (CSD)
Short Message Service (SMS)
FAX
Internet Services
TCP/UDP IP Connection
FTP Connection
MUX Integration
1x Packet Data
The 1x data call allows the service subscriber to send and receive data in an end-to-end packet-
transfer mode, without utilizing network resources in circuit-switched mode.
The SMC modem is able to both 1x data call and other CDMA services, but can only operate one set
of services at a time (1x data call or CSD).
The SMC modem can activate a 1x data call and at the same time be alerted for an incoming call.
This functionality is available on the SMC modem single serial line by either of two procedure
options:
Option 1:
1. While in 1x data call, listen to the RI signal (RS232) for an incoming call ring.
2. Upon being interrupted by the RI signal, drop the DTR line to switch to command mode
(depending on the previous DTR configuration: AT&D).
3. Answer the call (suspending the data call session).
4. At the end of the call, pull the DTR to resume the data call session.
Option 2:
Use the MUX protocol for virtual channels support, with a unique channel for the 1x data call
session (Data) and a unique channel for answering the voice call (command)