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COURIER HIGH SPEED MODEMS
4-24 Data Mode Operations
Return online with the On command, or hang up with the
Hn command.
&D2 Normal DTR operations. The terminal or computer must
send a DTR signal for the modem to accept commands.
Dropping DTR terminates a call.
&Sn The modem sends the computer or terminal a Data Set Ready
(DSR) signal via the RS-232 interface. (Data Set is industry
jargon for modem.) Few, if any, commercial communications
programs require the modem to control DSR, &S1. Leave the
modem set for DSR overridden, &S0, unless you know that
your installation requires a different setting.
&S0 DSR is always ON (override). Default.
&S1 In Originate mode, the modem sends the DSR after it
dials, when it detects the remote modem's answer tone.
In Answer mode, the modem sends the DSR after it
sends an answer tone.
&S2 This option is for specialized equipment such as
automatic callback units. On loss of carrier, the modem
sends a pulsed DSR signal with Clear to Send (CTS)
following Carrier Detect (CD).
&S3 This is the same as &S2, but without the CTS following
CD.
&S4 The modem sends the computer a DSR signal at the same
time that it sends the Carrier Detect (CD) signal.
Flow Control
Flow control allows the modem to monitor the amount of data
coming from the computer or the remote modem, and notify
either end if its buffers are too full, so that they stop sending
data for a moment.
The modem uses either hardware or software flow control.
Your software and machine must support whichever type you
select.