Product data

USRobotics
Command Reference
Syntax and Procedures - 12
parameter unchanged;
• Issue the OK result code, and leave the previous value of the param-
eter unchanged; or,
• Issue the OK result code, and set the parameter value to the valid
value nearest to that specified in the command line.
The description of each command specifies which of these three techniques is
used to handle invalid parameter values for that command or parameter.
Modem Responses
While in command state and online command state, the modem will issue
responses using the same rate, word length, and parity as the most recently
received DTE command line. In the event that no DTE command has yet been
received, rate, word length, and parity used will depend on the capabilities of the
modem.
When the modem transitions from the command state or online command state to
the online data state, the result code CONNECT should be issued at the bit rate
and parity used during the command state. When the modem transitions from the
online data state to the command state or online command state, the result codes
should be issued at the bit rate used during the online data state. Thereafter, any
unsolicited result codes should use the bit rate and parity of the last command line
issued by the DTE to the modem.
The characters of a response will be contiguous, with no more than 100
milliseconds of mark idle issued between characters in addition to stop elements.
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:
The characters transmitted for the header are determined by the V command.
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.
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.