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Chapter 4 - V.22bis Commands
Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide 17
n Value in ATXn Command
Short Form Long Form
0 1 2 3 4
42 CARRIER 75/1200 X X X X X
46 CARRIER 1200 X X X X X
47 CARRIER 2400 X X X X X
67 PROTOCOL: V42 X X X X X
70 PROTOCOL: NONE X X X X X
83 LINE IN USE X X X X X
85 OFF-HOOK INTRUSION X X X X X
86 LINE REVERSAL DETECTED X X X X X
87 NO LINE X X X X X
Note:
An 'x' in a column indicates that the message (either the long form if verbose, or the value only for short form) will
be generated when that particular value of 'n' (shown at the top of the column) has been selected by the use of
ATXn. If the column is blank, then no message will be generated for that x option. A numeral indicates which less
explicit message (verbose or short form) will be output for that X option.
&C RLSD Option
The modem controls the RLSD output in accordance with the parameter supplied. The parameter value, if valid, is
written to S21 bit 5.
Syntax &C<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 RLSD remains ON at all times.
1 RLSD follows the state of the carrier. (Default)
Result Codes OK 0 or 1
ERROR Otherwise
&D DTR Option
This command interprets the ON to OFF transition of the DTR signal from the DTE in accordance with the parameter
supplied. The parameter value, if valid, is written to S21 bits 3 and 4. Also, see S25.
Syntax &D<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 DTR drop is interpreted according to the current &Qn setting as follows:
&Q0, &Q5, &Q6: DTR is ignored (assumed ON). Allows operation with DTEs, which do not provide DTR.
&Q1: DTR drop causes the modem to hang up. Auto-answer is not affected.
&Q2, &Q3: DTR drop causes the modem to hang up. Auto-answer is inhibited.
1 DTR drop is interpreted according to the current &Qn setting as follows:
&Q0, &Q1, &Q5, &Q6: DTR drop is interpreted by the modem as if the asynchronous escape sequence had been
entered. The modem returns to asynchronous command state without disconnecting.
&Q2, &Q3: DTR drop causes the modem to hang up. Auto-answer is inhibited.
2 DTR drop is interpreted according to the current &Qn setting as follows:
&Q0 through &Q6: DTR drop causes the modem to hang up. Auto-answer is inhibited. (Default)
3 DTR drop is interpreted according to the current &Qn setting as follows:
&Q0, &Q1, &Q5, &Q6: DTR drop causes the modem to perform a soft reset as if the Z command were received.
&Q2, &Q3: DTR drop causes the modem to hang up. Auto-answer is inhibited.
&K Flow Control
This command defines the DTE/DCE (terminal/modem) flow control mechanism. The parameter value, if valid, is
written to S39 bits 0, 1, and 2.
Syntax &K<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Disables flow control.
3 Enables RTS/CTS flow control. (Default for data modem modes.)
4 Enables XON/XOFF flow control.
5 Enables transparent XON/XOFF flow control.
Result Codes OK <value> = 0, 3, 4, or 5
ERROR Otherwise