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	Latest News

	Worlds smallest UMTS module UC864 and CDMA module CC864-Dual
	Tiny antennas – aerials for smallest and low cost applications
	Batteries, Microphones and Loudspeakers especially designed for your wireless applications
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	Contact

	Round Solutions Ltd. Regent House Business Centre 24-25 Knutford Place Marble Arch London W1H5YN UK Sales inquiries: Tel +44 (0) 207 569-3210 Fax +44 (0) 207 569-3001 e-mail
	Round Solutions GmbH & Co KG Im Steingrund 3 63303 Dreieich Germany Deutsch: Tel +49 6103 270440 English: Tel +49 6103 27044200 Fax +49 6103 27044199 e-mail
	Round Solutions Nordics B Ved Klaedebo 18 DK-2970 Hörsholm Denmark Tel: +45 (0)36 96 73 95 Tel: +49 6103 27044 122 Fax: +49 6103 27044 199 Kundtjänst på Svenska: Tel +49 6103 27044210 e-mail
	Round Solutions Italy Parliamo italiano Tel +49 6103 27044220 Fax +49 6103 27044199 e-mail
	Round Solutions Spain - South America Hablamos el espanol Tel +49 6103 27044230 Fax +49 6103 27044199 e-mail

Basic Knowledge

Q: What are AT commands ?

AT commands, also called Hayes AT commands, are based on the Hayes Modem de facto standard, ATTENTION Commands for modems. They are used to communicate with your modem. These commands modify your modem's behaviour or instruct the modem to do something specific, such as dialling a telephone number. The "AT" refers to getting the ATtention of your modem.

Here are some typical reasons using AT commands:

to identify your modem and firmware version.

to send an init string to initialize your modem, or put it in a known state.

to turn the modem speaker on or off.

to turn the speak volume up or down.

to force an error correction mode.

to specify the type of flow control.

to limit the speed of your connection if you are having line problems.

etc.

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