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S-Register Definitions
268 Chapter 3 Modem Emulation Commands
S21
General Options Status. Indicates the status of
command options.
• Default: 52 (34h) (00110100b)
• Bits 0 - 2: Ignored.
• Bits 3-4: DTE’s DTR behavior (&Dn):
0 = DTR drop is ignored (&D0).
1 = DTR drop causes a transition from data to
command mode without hanging up an existing
connection (&D1).
2 = DTR drop hangs up the existing connection
(&D2) (Default.)
3 = DTR drop causes the modem to do a soft reset if
the ATZ command was executed (&D3).
• Bit 5: Modem’s DTR behavior:
0 = The modem’s DTR remains on at all times
(&C0).
1 = The modem’s DTR follows the state of the TCP
connection (&C1). (Default.)
• Bits 6-7: Ignored.
- - 52 (34h)
S25
Delay to DTR Off. The amount of time that the modem
will delay before taking the action specified by the
AT&Dn command.
0-255 s or 0.01 s 5
Register Function Range Units Default