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Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 38
Command: &C RLSD (DCD) Option
Description: The modem controls the RLSD output in accordance with the parameter
supplied. The parameter value, if valid, is written to S21 bit 5.
Default: 1
Defined Values: 0 RLSD remains ON at all times.
1 RLSD follows the state of the carrier.
Result Codes: OK
Otherwise ERROR
Command: &D DTR Option
Description: 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.
Default: 2
Defined Values: &D0 DTR drop is interpreted according to the current &Q 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.
&D1 DTR drop is interpreted according to the current &Q 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 causes the modem to hang up Auto-answer is
inhibited.
&D2 DTR drop is interpreted according to the current &Q setting as
follows:
&Q0 through &Q6 drop caused the modem to hang up. Auto-answer
is inhibited.
&D3 DTR drop is interpreted according to the current &Q setting as
follows:
&Q0, &Q1, &Q5, &Q6 DTR drop causes the modem to perform a soft
reset as if the Z command were received. The &Y setting determines
which profile is loaded.
&Q2, &Q3 DTR drop causes the modem to hang up. Auto-answer is
inhibited.
If &Q5, &Q6, +FCLASS=1 or +FCLASS=2 is in effect, the action
taken is the same as for &Q0.
Command: &K Flow Control
Description: Defines the DTE/DCE (terminal/modem) flow control mechanism. The
parameter value, if valid, is written to S39 bits 0, 1, and 2.
Default: 3 (for data modem modes)
Defined Values: 0 Disables flow control.
3 Enables RTS/CTS flow control.
4 Enables XON/XOFF flow control.
5 Enables transparent XON/XOFF flow control.
Note: Upon reset, both RTS/CTS and XON/XOFF flow control is enabled
for fax modem and voice modes.
Result Codes: OK
Otherwise ERROR