Intel 536EX Intel Confidential, Data Mode AT COMMANDS, Data Reporting Wn Mapping, •ATW0, •ATW2

		Data Mode AT COMMANDS
Modem Setup	Host	Modem Response
	Command
No Echo, Numeric (E0, V0)	AT<CR>	0<CR>
	ATS0?<CR>	000<CR><LF>0<CR>
No Echo, Text (E0, V1)	AT<CR>	<CR><LF>OK<CR><LF>
	ATS0?<CR>	<CR><LF>000<CR><LF><CR><LF>OK
		<CR><LF>

The DCE can be configures to use different response codes depending on the V.250 command that is enabled (AT+MR, AT+ER, AT+DR, and AT+ILRR). Alternatively, the ATWn command can be used to set these V.250 commands. The mapping for the ATWn command to V.250 commands is shown in Table 14. The setting for the ATXn command (page 43) can affect which ATWn response codes are reported to the DCE. The ATXn command configures the modem call progress detection and reporting requirements during dialing (for example, dial tone and busy tone detection). The ATQn command selects whether the modem sends result codes to the DTE.

Table 14. Data Reporting Wn Mapping

Wn	+ER	+DR	+MR	+ILRR
W0	Disable	Disable	Disable	Disable
W2	Disable	Disable	Enable	Enable
W3	Enable	Enable	Enable	Enable
W4	Enable	Enable	Enable	Disable

For example, a connection is established with the remote modem as shown below (with LAPM error correction and V.42 bis data compression). The telephone line (or modem-to-modem connection) data rate is 33,600 bps and the local UART (DTE-to-modem) connection rate is 115,200 bps.

Figure 3. Example of a Remote Connection

	UART	Telephone
		Line
DTE	Interface
	LOCAL MODEM	REMOTE MODEM
	(115,200 bps)	(33,600 bps)

The modem then sends the ‘CONNECT’ messages for the following four Wn commands:

•ATW0

ILRR: 115200

CONNECT 50666

•ATW2

+MCR: V90

+MRR: 28800 CONNECT 50666

536EX Chipset Developer’s Manual 27

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