Paradyne 3821PLUS User Manual
Page 80
COMSPHERE 3821Plus Modem
4-8
February 1998
3821-A2-GB20-30
Table 4-1
(6 of 13)
3821
Plus AT Commands
&D
n – DTR Action
Data Terminal Ready (DTR) is a signal from the DTE to the modem indicating that the DTE is connected and ready for
operation.
&D0
Ignore. Modem ignores the true status of DTR and treats it as always ON.
&D1
Off=Command Mode. Modem enters online Command Mode if connected when DTR switches off.
&D2
Standard RS232. DTR Signal is controlled by the DTE.
&D3
Off=Reload Strap. Follows Standard RS232 operation, except that when DTR switches Off, the
modem loads the Active (Saved) area into the Active (Operating) area.
&D4
Controls On-Hook. Follows Standard RS232 operation, except that modem does not disconnect
until DTR is lowered by the DTE.
&D6
Off=Restrap to Async Dial. The factory default template Async Dial is loaded when DTR switches off.
&F
n – Select Factory Default Configuration Options
Loads factory configuration options into the Active (Operating) area. &F5 and &F6 are valid only for the North America
country code, and only if ETC is installed.
&F0
Async Dial
&F1
Sync Dial
&F2
Sync Leased (Answer Mode)
&F3 UNIX
Dial
&F4
Sync Leased (Originate Mode)
&F5
Cellular (Mobile)
&F6
Cellular (PSTN)
&G
n – V.22bis Guard Tone
Determines whether the V.22bis guard tone is disabled, set to 550 Hz, or set to 1800 Hz.
&G0 Disable
&G1 550
Hz
&G2 1800
Hz
NOTE:
The default and permitted settings of this option are country-dependent. See