
DART 200 CDPD Modem User’s Guide | 8 Application Programming |
With three variables and only two signal lines, decide which two of the three items are most crucial to the application. Usually, RF in range and registration state are tracked. If both of these statuses are present, then a Dial command (ATD) can be issued. To determine more than two items of status the MAS escapes to command mode and reads the network status register
∙DTR (Data Terminal Ready) - Transitioning this signal lets the application enter command mode without having to use the escape sequence. To do this, the &D1 (escape) or &D2 (escape and
∙
1Registration denied - Network Entity Identifier (NEI) may be in use by another device
2Service currently not available
3Invalid NEI (IP Address)
4Insufficient authentication credentials
5Authentication credentials not supported
6NEI has exceeded usage limitations
7Service denied on this subnetwork; try an alternate Provider
250Timed out waiting for home Mobile Data Intermediate Station (MDIS) registration response
251Mobile Data Link Protocol (MDLP) parameters unsupported
252MDLP version unsupported
254Could not access the CDPD network
255Could not
∙
∙ RF in range - value of 128 or greater (bit 7) ∙ Registered - odd value (bit 0)
∙ Connected - value of 133, 165, 197 or 229 (bit 2 and not bit 3)
∙
1During the connection process
2During the transmission of a packet
3During the reception of a packet
∙
24No socket available
67Address already in use
69Network is down
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