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I NTEGRATED C IRCUITS D IVISION
AT Command Set
CPC2400E
Command
X Call Progress
Function and Description
The X command controls whether or not a busy signal or dial tone should be detected when dialing. The X command
also limits the result codes the modem may return when dialing. The operation of the X command is con?gurable for
operation in different countries.
X0 Neither busy signal nor dial tone are detected. When a telephone line connection is made the result
code does not indicate the telephone line data rate.
X1 Neither busy signal nor dial tone are detected. When a telephone line connection is made the result
code indicates the telephone line data rate.
X2 Busy signal is not detected. Dial tone is detected. When a telephone line connection is made the result
code indicates the telephone line data rate.
X3 Busy signal is detected. Dial tone is not detected. When a telephone line connection is made the result
code indicates the telephone line data rate.
X4 Both busy signal and dial tone are detected. When a telephone line connection is made the result
code indicates the telephone line data rate. This is the default value in North America.
The @ and W dial modi?ers are not affected by the X command. The @ dial modi?er may return the result codes 8
(NO ANSWER) or 7 (BUSY) each time it appears in the dial string. The W dial modi?er may return the result codes 6
(NO DIALTONE) or 7 (BUSY) each time it appears in the dial string.
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