Intel MD566X manual Fax Class 1 Commands, +FREV?/+FMR? none

56K V.92 Data, Fax, and Voice Chipset

Table 5-1. Fax Identity Command Descriptions

Identifies Product Version Number: This command causes the DCE to report the modem chipset revision level. This command is identical to ATI1 and AT+GMR?.

+FREV?/+FMR? none

AT+FREV?

CD08.55-612 (10/19/99) PARALLEL-SPEAKERPHONE 05

OK

5.2 Fax Class 1 Commands

The fax Class 1 AT commands are divided into three types: class selection and capabilities, data stream transfers, and silence-time timers. All fax mode commands, except the silence-time timers, must be the last command on the command line.

Each command may be used as follows:
+F<command>?	Reads current setting
+F<command> = ?	Reads permissible settings
+F<command> = <parameter>	Sets parameters

NOTE: To originate a call, answer, and hang up, use the ATD, ATA, and ATHn commands, respectively.

The fax AT+FCLASS command is used for changing between fax classes, determining the current class selection, and determining the supported fax classes. Both data/fax Class 0 (data modem mode) and Class 1 (fax modem mode) are implemented by the modem. In Class 0, the DTE-to- modem data rate can be set from 300 bps to 115,200 bps. In Class 1, it is recommended that the DTE-to-modem data rate is set to 19,200 bps.

The silence-time timers consist of AT+FTS=<TIME> and AT+FRS=<TIME>. Silence time is defined as the length of time when the modem neither receives nor transmits energy (that is, modem transmit carrier) on the telephone line.

The modem exchanges streams of data with the DTE while executing the data transfer commands AT+FTM=<mod>, AT+FTH=<mod>, AT+FRM=<mod>, and AT+FRH=<mod>. The values supported for <mod> are provided in Table 5-2.

During data transfer, an ASCII <DLE> character ($10h) is used as a special character to shield other special characters.

Special characters in the data stream are used in the following way:

any data ... <DLE><ETX>	end of data stream
any data ... <DLE><DLE>	single $10 in data stream
any data ... <DLE>
<not DLE or ETX>	delete both <DLE> and next character

When the DTE transfers data to the modem, the DTE must insert a <DLE> for each <DLE> in the original data stream. In addition, when data is no longer available, the DTE must add the stream terminator <DLE><ETX> to the end of the data stream. The modem buffers up to one thousand

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