Comtrol AT Commands for SmartACFL - Manual (Page 19)

Command Reference Manual
100722A Conexant 2-7
2.7.1 Responses
There are two types of responses that may be issued by the modem: information text and result codes.
Information Text. Information text responses consist of three parts: a header, information text, and a trailer:
1. The characters transmitted for the header are determined by the V command.
2. The trailer consists of two characters, being the character having the ordinal value of parameter S3 followed by the
character having the ordinal value of parameter S4.
3. Information text usually consists of a single line; information text returned in response to some commands may contain
multiple lines, and the text may therefore include CR, LF, and other formatting characters to improve readability.
Result Code Parts. Result codes consist of three parts: a header, the result text, and a trailer.
1. The characters transmitted for the header and trailer are determined by the V command setting.
2. The result text may be transmitted as a number or as a string, also depending on a the V command setting.
Result Code Types. There are three types of result codes: final, intermediate, and unsolicited. Result codes are described in
Section 3.5.
1. A final result code indicates the completion of a full modem action and a ability to accept new commands from the DTE.
2. An intermediate result code is a report of the progress of an modem action. The CONNECT result code is an
intermediate result code. In the case of a dialing or answering 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).
3. Unsolicited result codes (such as RING) indicate the occurrence of an event not directly associated with the issuance of
a command from the DTE.
2.7.2 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>
A single space character separates the colon character from the <value>; no space appears between the result code name
and the colon. If multiple values are to be reported with the result code, the form is:
+<name>: <compound_value>
Fax Modes. If a single value is to be reported, the form of the result code is:
<value> or (<value>)