AT Command Set for Nokia 8850 4Copyright © 2000. Nokia Mobile Phones. All rights reserved.AT Command SyntaxNote that the "AT" or "at" prefix must be included at the beginning of each commandline. You may type several AT commands on the same line, and in such cases youneed to type the "AT" or "at" prefix only at the beginning of the command line.The marking used in a command syntax is the setting value typed in as a part ofthe command. If the value is optional it is enclosed into square brackets. When youselect a setting value with an AT command, the setting is valid until you change it.Some AT commands are not supported by all Nokia's products. Giving a commandwhich is not supported causes an error response. Also, some parameters may not besupported by all products, and in this case those parameters are just ignored incommands or left blank in responses.Command LineSee figure below for general structure of a command line.Basic structure of a command line(ETSI, GSM 07.07 version 5.4.0, chapter 4.1.)Standardized basic commands are found only in V.25ter. GSM commands usesyntax rules of extended commands. Every extended command has a test command(=?) to test the existence of the command and to give information about the type ofits subparameters. Parameter type commands also have a read command (?) tocheck the current values of subparameters. Action type commands do not store thevalues of any of their possible subparameters, and therefore do not have a readcommand.If verbose responses are enabled with command V1 (see page 52) and allcommands in a command line has been performed successfully, result codeOK is sent from the TA to the TE. If numeric responses areenabled with command V0 (see page 52), result code 0 is sent instead.If verbose responses are enabled with command V1 and subparameter values of acommand are not accepted by the TA (or command itself is invalid, or commandcannot be performed for some reason), result code ERROR issent to the TE and no subsequent commands in the command line are processed. Ifnumeric responses are enabled with command V0, result code 4 is sentinstead. ERROR (or 4) response may be replaced by +CME ERROR: or +CMSERROR: when the command was not processed due to an error related to MEor network operation.
