Sierra Wireless DART 300 manual User’s Guide AT Command Reference, Options

User’s Guide AT Command Reference

Table 12-1: AT Commands in CDPD Mode (continued)

Command	Description
D [options]	Dial
	Initiates a TCP or UDP PAD client session. This command is not supported in SLIP and PPP
	mode. Results in SLIP/PPP are undocumented.
	In PAD service modes, this is equivalent to ATO “go on-line”, turn on Data Carrier Detect
	(DCD), and provide the packet service according to +WS45 (Packet Service). Command options
	determine the destination address of the connection and the originating NEI account to use.
	Options:
	ip.port A Destination IP address and port are specified according to the following syntax:
	[x.x.x.x[.y]] where x.x.x.x is a valid IP address (x has value 0 – 255) and y is a valid
	port number. Friends Only does not impact client sessions. The modem may dial any
	IP address whether or not it is in the Friends list.
	Both the IP address and the port are technically optional, but the port is ignored if
	specified without an IP address. If the IP address and/or port are not specified, then the
	values of the last dial command will be used. However, there is no facility to read the
	current default address and port. The host must track this or provide the address and
	port explicitly with each dial. It is highly recommended that all dial commands
	include the destination IP and port.

qq = 1 – 10. Quick dial using the IP and port values in the Friends List indexed by the value q. This is an alternative to using the explicit ip.port option.

Notes:

In UDP and TCP modes, each new dial command will generate a packet source address consisting of the modem’s registered NEI as the IP address and a port number for the session. The port number is a pseudo-random number in the range of 1025 to 4999 and will remain fixed for the duration of the session. Changing the port number with each new session allows the modem to discard late-arriving packets when the earlier session has been closed.

If the modem was not registered when the Dial command is issued, it will attempt to register as though a +WPREG command was prefixed to the dial.

In UPD, SLIP and PPP service +WS179 controls a registration wait status. If +WS179=0, the D command goes immediately “online”, issuing the “CONNECT” result code and setting DCD before completing the registration process. The modem remains “connected” even if registration fails.

If +WS179 is non-zero, the D command waits for the modem to complete NEI registration, or for +WS198 (Registration Wait Time) seconds to expire, before issuing a result code. If +WS198 expires, or registration fails, the modem issues the “NO CARRIER” result code and returns to command state.

TCP service must complete the logical connection before CONNECT is issued regardless of the setting of +WS179.

Result Codes:
OK	Command is terminated with a semicolon (;) cancellation.
CONNECT	normal response; the session is open.

NO CARRIER failed to register the NEI within time allowed.

NO ANSWER Only in TCP service, this indicates failure to complete the TCP handshake.

ERROR	Invalid IP address, port, or unrecognized parameters are specified.
PAD ERROR	A fault has occurred in the PAD service and the modem will have to be reset.

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