ISU AT Command Reference

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ISU AT Command ReferencePhase I AT Commands5.25 &Cn - DCD OptionSelect how the ISU controls the DCD behavior.0 DCD is forced on at all times.1 DCD indicates the connection status (default).5.26 &Dn - DTR Option (Initial implementation; revised in Phase III)Set the ISU reaction to DTR signal.DTR must be ON during on-hook command mode. If DTR transitions from ON to OFF during on-hookcommand mode, operation will be locked after approximately 10 seconds. On-hook command modeoperation will resume when DTR is restored ON.DTR must be ON at call connection.DTR must be ON during both in-call command mode and in-call data mode. Reaction to DTR ON to OFFtransitions during in-call command mode and in-call data mode is determined by the &Dn setting as shownbelow.0 If DTR transitions from ON to OFF during in-call command mode, and DTR is restored ONwithin approximately 10 seconds, the call will remain up. If DTR is not restored ON withinapproximately 10 seconds, the call will drop to on-hook command mode.If DTR transitions from ON to OFF during in-call data mode, the mode will remain in in-calldata mode. If DTR is restored ON within approximately 10 seconds, the call will remain up.If DTR is not restored ON within approximately 10 seconds, the call will drop to on-hookcommand mode.1 If DTR transitions from ON to OFF during in-call command mode, and DTR is restored ONwithin approximately 10 seconds, the call will remain up. If DTR is not restored ON withinapproximately 10 seconds, the call will drop to on-hook command mode.If DTR transitions from ON to OFF during in-call data mode, the mode will change to in-callcommand mode. If DTR is restored ON within approximately 10 seconds, the call willremain up. If DTR is not restored ON within approximately 10 seconds, the call will drop toon-hook command mode.2 If DTR transitions from ON to OFF during either in-call command mode or in-call data mode,the call will drop to on-hook command mode (default).3 If DTR transitions from ON to OFF during either in-call command mode or in-call data mode,the call will drop to on-hook command mode and the ISU will reset to AT command profile 0.5.27 &Fn - Restore Factory SettingsRecall factory defaults.0 Recall factory default 0.5.28 &Gn - Guard ToneSelect guard tone.No action, compatibility only.Any value for n is accepted.Version 2.6March 30, 2006 20
ISU AT Command ReferencePhase I AT Commands5.29 &Jn - Jack ControlControl the telephone jack configuration.No action, compatibility only.Allowed values for n are 0 and 1.5.30 &Kn - Flow ControlSelect the flow control method between the ISU and DTE.0 Disables flow control.3 Enables RTS/CTS flow control (default).4 Enables XON/XOFF flow control.6 Enables both RTS/CTS and XON/XOFF flow control.5.31 &Ln - Leased Line OperationRequest leased line or dial-up operation.No action, compatibility only.Any value for n is accepted.5.32 &Mn - Asynchronous/Synchronous ModeSelect the DTR operating mode.0 Selects normal asynchronous operation (default). (See &Q0.)5.33 &Pn - Pulse Dial Make/Break RatioSelect the make/break ratio during pulse dialing.No action, compatibility only.Allowed values for n are 0, 1, 2 and 3.5.34 &Qn - Sync/Async ModeSelect asynchronous mode. This is an extension of the &M command and is used to control the connectionmodes permitted.Note: The register is not updated right after the user requests new values because the requested values mayor may not be what IRLP will use once a data call is established due to negotiations with the other peer. Ifthe register is updated right away, this may give the user the impression that those values will be usedduring the data call, but there is no guarantee that will be the case. The real values will only be known oncea data call is established and the negotiation phase is done. For that reason, the values are written to theregister only after a call is established and both sides have negotiated parameter values (such as mode ofoperation). The value of the register will be reset to default value (5) after the call completed.0, 6 Normal asynchronous operation with no error correction (unacknowledged mode). .5 Asynchronous operation with error correction (acknowledged mode) (default)Version 2.6March 30, 2006 21
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ISU AT Command Reference

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