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Mode | Modem DCD Settings | Behavior | |
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Command/Data | Always on (&C0) | DTR is asserted | |
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Command/Data | Follow connection (&C1) | DTR is asserted only when TCP/IP | |
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| connection is present and has been accepted |
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| via ATA or |
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| when connection is lost |
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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. .
Mode | Modem DTR Settings | Response to loss of DCD |
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Offline | AT&D0 | Ignore |
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Offline | AT&D1 | Ignore |
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Offline | AT&D2 | Ignore |
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Online | AT&D0 | Ignore |
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Online | AT&D1 | Drop to command mode, preserving connection |
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Online | AT&D2 | Drop to command mode, terminating any |
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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.
Format |
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Dotted decimal | a.b.c.d or 192.168.1.1 | Numbers are from 0 to 255 | ||||||
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Comma decimal | a,b,c,d or 192,168,1,1 | For programs that don't allow dots in phone | ||||||
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Rev 3.0 B 2/15/08 | 53 |
