Synxcom SM9234D, User Manual

Page: 43 / 216

AT Commands
Page 43
command, the modem switches from command state to online data state, and
issues a CONNECT result code. This is an intermediate result code for the
modem because it cannot accept commands from the DTE while in online data
state. When the modem switches back to the command state it then issues a final
result code (such as OK or NO CARRIER).
Unsolicited result codes (such as RING) indicate the occurrence of an event not
directly associated with the issuance of a command from the DTE.
Extended Syntax Result Codes
Extended syntax result codes may be issued in response to either basic or extended
commands, or both. The appropriate responses are specified in the definitions of
the commands, the responses, or both.
The general format of extended syntax result codes is the same as result codes
defined in TIA-602 with regard to headers and trailers. The characters specified in
S-parameters S3 and S4 are used in headers and trailers of extended syntax result
codes as they are in basic format result codes. The setting of the V command
affects the headers and trailers associated with extended syntax result codes in the
same manner as basic format result codes; however, unlike basic format result
codes, extended syntax result codes have no numeric equivalent, and are always
issued in alphabetic form.
Extended syntax result codes are subject to suppression by the Q1 command, as
with basic format result codes. The issuance of extended syntax result codes are
not be affected by the setting of the X command.
Extended syntax result codes may be either final, intermediate, or unsolicited; the
type being indicated in the definition of the result code.
Extended syntax result codes are prefixed by the "+" character to avoid duplication
of basic format result codes specified in TIA-602. Following the "+" character, the
name of the result code appears; result code names follow the same rules as
command names.
Extended syntax result codes may include the reporting of values. The definition of
the result code specifies whether or not values are appended to the result code,
and, if so, how many, their types, and their assumed default values if omitted.
Data/voice Modes. When no values are to be reported, the result code appears in
the simplest form:
+<name>
If a single value is to be reported, the form of the result code is:
+<name>: <value>