495Example # Send dialing command to call number 169. system-view[Sysname] interface serial 2/0[Sysname-Serial2/0] physical-mode async[Sysname-Serial2/0] sendat ATD169service modem-callbackSyntax service modem-callbackNn Specifies the local modem to perform negotiation connected withremote modem of different speed. The n argument is 0 or 1.N0 adopts the communication standard specified by S37 register andATB commands to perform digital switch during sending or receivingcalling.N1 adopts the transmission speed specified by S37 register and ATBcommands to negotiate.On Forces a modem to be in the online mode. The n argument can be 0, 1or 3.O0 sets a modem to be in online mode.O1 Initiates the balance and reorganizes the sequences before returnsto the online mode.O3 Negotiates the transmission speed before returns to the onlinemode.Note that this command causes a modem to operate in the onlinemode again after you switch to the command mode by executing the+++ (Escape Code) command,Qn Enables modem to send result codes.The n argument can be 0 or 1.Q0 enables output result codes, which is a default setting.Q1 disables output result codes.Sr=n Sets the value of a specified register to be n. You can use thiscommand to modify the value of a specified register.You can specify the register to be set by specifying the r argument.The r argument is a number that can be one among 0 through 27, 29,31 through 33, 35, 37, and 89.The n argument is the value assigned to the register, which rangesfrom 0 to 255.T Specifies to perform tone dialing (the default). This command can alsobe used as the dialing corrector.P Specifies to perform pulse dialing. After you execute this command, amodem performs pulse dialing until you execute the T command. Thiscommand can also be used as the dialing corrector.Vn Specifies format of result codes returned by modem. The n argumentcan be 0 or 1.V0 sends result codes (numeric).V1 sends result codes (text), which is a default setting.Table 80 Description on common AT commandsCommand Description
