Sierra Wireless DART 200 CDPD Modem - Manual (Page 100)

DART 200 CDPD Modem User’s Guide 8 Application Programming
Sierra Wireless, Inc. 8-6
70 Network is unreachable
71 Network dropped connection or reset
72 Software caused connection abort
73 Connection reset by peer
75 Socket is already connected
76 Socket is not connected
78 Connection timed out
79 Connection refused (for DART to DART the server function is
not active or is of the wrong type)
81 Host is down
82 Host 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
0 CDPD not available
1 CDPD 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
0 Protocol not active
1 Temporary Equipment Identifier (TEI) assignment pending
2 Link connection establishment pending - waiting for
Unnumbered Acknowledgement (UA)
3 Encryption key exchange pending - waiting for MDIS Key
Exchange (IKE)
4 Registration pending - waiting for Intermediate System
Confirmation (ISC)
5 Registration 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: