Robustel M1000 User Guide - Manual (Page 52)

Robustel GoRugged M1000 User Guide
RT_UG_M1000 _v.2.0.0
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4.2 GSM CSD Connection (Only Available under Normal Mode)
4.2.1 Overview
A Circuit-Switched Data Connection makes the wireless modem work in a manner similar to a regular analog modem.
CSD (Circuit Switched Data) is the original form of data transmission developed for GSM systems. By using a single
radio time slot, CSD is able to deliver 9.6 to 14.4 kbit/s data transmission to both the GSM Network and PSTN
Switching Subsystem through direct calls. Most of the time, it is initiated by standard AT commands. Using the
modem to access remote devices by CSD is often more convenient than installing cables and data lines. Data
collection and monitoring will be more flexible since CSD can be used for applications that are hard to wire or hard
to access.
Note: Ensure that your SIM card has the CSD Service activated. For most regions, you must apply to your mobile
service provider to receive this service.
4.2.2 Establishing a CSD Connection
1. Enable CSD at Basic Tab under Normal Mode;
2. Start Modem Configurator and click the Debug tab under Config Mode, with the current communication
parameters (default: 115200 bps, 8 for Data bits, None for Parity, 1 for Stop bits, and None for flow control).
3. Type ATD <phone number> and click Send to establish a CSD connection. (e.g. ATD 123456, in which 123456 is
the phone number.)
4. After remote side answering the CSD call, then the CSD connection has been established successfully, and you
can switch to data mode to proceed with data communication.