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+CMD?To test if a particular command is supported, along with the range of values it supports,use the TEST command:+CMD=?An extended command must be terminated with a semicolon if another command followsit in the same command line. The following table describes the extended ATconfiguration commands.Table 5: Extended AT Configuration Commands TableCommand Description+IFC TE2-MT2 Local Flow Control.This extended-format compound parameter is used to control the operationof local flow control between the TE2 and the MT2. The format is:AT+IFC=,Where: Specifies the method to be used by the DTE tocontrol the flow of received data from the DCE. Specifies the method to be used by the DCE tocontrol the flow of transmitted data from the DTE.The valid numeric variables for the +IFC command are as follows:0 No Flow Control1 Xon/Xoff2 HardwareBy default, the modem is set up as AT+IFC=2,2 to allow hardware flowcontrol in both directions.+IPR Fixed Rm Rate.This numeric extended-format parameter specifies the data rate at whichthe MT2 will accept commands, in addition to 1200bps or 9600bps (asrequired in EIA/TIA-602). It may be used to select operation at rates atwhich the MT2 is not capable of automatically detecting the data ratebeing used by the TE2. Rm default rates set at 115.2Kbps.+ICF Local RS-232 Interface Character Framing.This parameter determines the character framing used at the local RS-232interface. The syntax is: AT+ICF=,Where: is a single digit and determines the number of data bits, thepresence of a parity bit, and the number of stop bits in the start-stop frameaccording to the following values: Meaning1 8 Data, 2 Stop2 8 Data, 1 Parity, 1 Stop3 8 Data, 1 Stop is a single digit and determines how the parity bit is generatedand checked, if present, according to the following values: Meaning0 Odd1 Even
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