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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 Appendix H.