Sierra Wireless DART 200 CDPD Modem manual Automatic registration

DART 200 CDPD Modem User’s Guide 8 Application Programming

70Network is unreachable

71Network dropped connection or reset

72Software caused connection abort

73Connection reset by peer

75Socket is already connected

76Socket is not connected

78Connection timed out

79Connection refused (for DART to DART the server function is not active or is of the wrong type)

81Host is down

82Host is unreachable

∙S-Register 101 (CDPD available flag) - Indicates not only if the modem acquired a channel, but also whether it established (or reestablished) CDPD communications with the MDIS. This is a better indicator than the RF in range bit found in S-Register 57

0CDPD not available

1CDPD available

∙S-Register 102 (mean Receive Signal Strength Indication for acquired channel) - Indicates the RF signal strength in dBm for the active channel. If CDPD is not currently available (S-Register 101 = 0), this value has no meaning

A negative value usually in the range of -50 to -113dBm. Values below -100 are unreliable, and below -110 cannot be used.

∙S-Register 126 (Registration progress status) - Indicates how far through the registration process the modem proceeded

0Protocol not active

1Temporary Equipment Identifier (TEI) assignment pending

2Link connection establishment pending - waiting for Unnumbered Acknowledgement (UA)

3Encryption key exchange pending - waiting for MDIS Key Exchange (IKE)

4Registration pending - waiting for Intermediate System Confirmation (ISC)

5Registration complete

Use the ATSn? command to read the S-Registers with the modem in command mode

After sensing the appropriate registers, if the MAS determines it needs to go back to online mode, it issues an ATO command (TCP or UDP), or AT*S command (SLIP) to do so.

Automatic registration

Before the DART 200 can operate on the CDPD network it must be registered. Registration is controlled by the AT\Rn command; the following options are available:

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