Paradyne Comsphere 3830 User Manual page 55

COMSPHERE 3800 Series Modems – Model 3830
Table 4-2
(14 of 22)
Model 3830 AT Commands
&S n DSR Control
Data Set Ready (DSR) is a signal from the modem to the DTE indicating
the modem is connected and ready for operation.
&S0 Forced On. Forces DSR output ON constantly. This is usually used
for leased-line applications and when the DTE requires DSR to always be
ON.
&S1 Standard RS232. Modem controls DSR to the DTE. The modem
raises DSR when it begins the handshake process. DSR lowers upon
disconnect. The modem is not ready to receive data until DSR, CTS, and
LSD are active.
&S2 Wink When Disconnect. DSR is normally forced ON, but is turned
Off for 1 to 2 seconds upon a disconnect.
&S3 Follows DTR. When the modem receives DTR from the DTE, it
sends DSR to the DTE.
&S4 On Early. DSR is low when the modem is in the idle state. DSR goes
high immediately upon a command to enter Data mode. This setting is
required for some modem pooling applications.
&S5 Delay to DTE. Operation is similar to the Standard RS232 setting
except that DSR does not turn ON until the modem enters Data mode.
Normally, the modem raises DSR when it begins the handshaking
process.
&S6 Dial Backup Toggle. DSR is turned Off during a dial backup attempt
in Leased mode, and on when a dial backup attempt is completed. DSR
is also turned Off when a disconnect begins, and ON when the
disconnect is complete.
4-20 November 1996 3830-A2-GB91-20