Sierra Wireless RJ-11 - Manual (Page 58)

Rev 3.0 B 2/15/08 53
The device server monitors its DCD signal in order to detect
changes in the deviceʹs DTR signal. The following behaviors
occur on loss of DCD only. .
Phone Numbers
The “phone number” used in an outgoing connection for an
“ATD” command may be a real phone number that is trans‐
lated to an IP/port pair (see Phone Number Translation) or it
consists of an IP address and optional port number. All leading
non‐numeric characters (such as the T or P dial modifiers) are
ignored. A number of formats are accepted for the “IP” phone
number.
Mode Modem DCD Settings Behavior
Command/Data Always on (&C0) DTR is asserted
Command/Data Follow connection (&C1) DTR is asserted only when TCP/IP
connection is present and has been accepted
via ATA or auto-answer. DTR is de-asserted
when connection is lost
Mode Modem DTR Settings Response to loss of DCD
Offline AT&D0 Ignore
Offline AT&D1 Ignore
Offline AT&D2 Ignore
Online AT&D0 Ignore
Online AT&D1 Drop to command mode, preserving connection
Online AT&D2 Drop to command mode, terminating any
connection
Format Example Notes
Dotted decimal a.b.c.d or 192.168.1.1 Numbers are from 0 to 255
Comma decimal a,b,c,d or 192,168,1,1 For programs that don't allow dots in phone
numbers