Intel 537EX manual Data Mode AT COMMANDS

Data Mode AT COMMANDS

Data Mode AT COMMANDS 3

The 536EX chipsets implement:

•Standard Hayes*-compatible AT commands and S-registers in data mode

•Standard EIA/TIA-578 AT commands in Class 1 fax mode

•Additional AT command sets for error correction, data compression and voice mode

In data mode, the AT commands configure the DCE (modem) to establish a connection with a remote data modem. In data mode, the 536EX chipsets execute the AT commands for error correction (MNP 2-4, V.42) and data compression (MNP 5, V.42 bis) described in Table 21 on page 57, as well as the fax and voice mode commands AT+FCLASS=1 (fax) and AT+FCLASS=8 (voice).

3.1Using AT Commands to Access the S-Registers [Sn?, Sn=x, ?]

The DTE can access the S-registers through the ATSn?, ATSn=x, and ? commands. For example, to configure the modem to automatically answer a data modem call after two rings, type ATS0=2.

Examples:

ATS0=2	Configures S-register				S0	to	‘2’
ATS0?	Reads	the	contents	of	S-register S0
ATS0=	Configures S-register				S0	to	‘0’
AT?	Reads	the	contents	of	the last accessed (read or write) S-register

3.2Modem Responses and Command Echo [En, Vn, Xn, Wn, Qn]

The ATEn command configures the DCE to send back to the DTE any data that the DTE sent to the DCE while in command mode. The ATVn command sets the DCE response codes to either text or numeric form. For example, upon successfully processing an AT command string, the DCE sends an ‘OK’ (text) or a ‘0’ (numeric) to the DTE.

Examples:

Modem Setup	Host	Modem Response
	Command
Echo, Numeric (E1, V0)	AT<CR>	AT<CR>0<CR>
	ATS0?<CR>	ATS0?<CR>000<CR><LF>0<CR>
Echo, Text (E1, V1)	AT<CR>	AT<CR><CR><LF> OK<CR><LF>
	ATS0?<CR>	ATS0?<CR><CR><LF>000<CR><LF><CR>
		<LF>OK<CR><LF>

26 536EX Chipset Developer’s Manual

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