Moxa ONCELL G2110-T User Manual download pdf (Page 74)

OnCell G2100 Series User’s Manual GSM/CSD Connection

5-2

Overview

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.

Initiating a CSD Connection

A CSD connection can be initiated using the OnCell G2100 Series modem and PComm Terminal

Emulator.

1. Start PComm Terminal Emulator with the current communication parameters default:

115200 bps, 8 data bits, None parity, 1 stop bit, and no flow control.

ATTENTION

Check the “SIGNAL” LED indicators on the front panel of the OnCell G2100 Series modem. If

the LEDs are all off, then the SIM card is not installed properly, or there is no signal present.

If only one LED is illuminated, then the signal is not strong enough to create a CSD connection.

Adjust the position of the antenna, change the location of the modem, or use an optional high-gain

antenna.

Verify that your SIM card has CSD service activated. For most regions, you must apply with your

mobile service provider to receive this service.

Verify that the RS-232 port on the OnCell G2100 Series modem is connected. For the OnCell

G2150I, verify that DIP switch 1 is set to ON.

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Moxa ONCELL G2110-T User Manual Page 74