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Z0221524ASCR4508TR 参数 Datasheet PDF下载

Z0221524ASCR4508TR图片预览
型号: Z0221524ASCR4508TR
PDF下载: 下载PDF文件 查看货源
内容描述: 单芯片调制解调器,集成控制器,数据泵和模拟前端 [Single Chip Modem with Integrated Controller, Data Pump, and Analog Front End]
分类和应用: 调制解调器控制器
文件页数/大小: 74 页 / 663 K
品牌: ZILOG [ ZILOG, INC. ]
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Z02215  
Single Chip Modem with Integrated Controller, Data Pump, and AFE  
13  
ON-LINE  
After successfully completing Handshaking the modems enter the ON-LINE state.  
When a modem is in the ON-LINE state, data received from its terminal is sent  
over the telephone line to the other modem. Data received from the other modem  
is sent to the terminal.  
COMMAND  
If the terminal sends a special escape sequence to a modem in the ON-LINE  
state, the modem enters the COMMAND state. During COMMAND state the  
modem maintains the connection with the other modem but does not pass data  
between the terminal and the other modem. Instead, data received from the termi-  
nal is treated as AT commands in the same way as if the modem was in the Idle  
state. The modem can be returned to the ON-LINE state by the Ocommand. Data  
received from the other modem while a modem is in COMMAND state is dis-  
carded unless the modem can buffer it for display on the terminal when the  
modem re-enters the ON-LINE state.  
Retrain  
During a telephone line connection, the modem tries to remain synchronized with  
the remote modem by adapting to changes in telephone line connection and  
bridging transient noises such as call waiting, analog switching and cross talk. In  
V.22bis and higher speed data modes, if the modem loses synchronization with  
the remote modem data can not be received until synchronization is restored by a  
process called Retraining. During Retraining the modem accepts data and com-  
mands from the terminal but does not transmit data to, or receive data from, the  
other modem.  
AT Command Set  
Command lines are typed to the modem from the terminal when the modem is in  
the IDLE or COMMAND state. The modem does not execute any of the com-  
mands in a command line until after the command line is ended by the end-of-line  
character <CR>. A command line is a string of characters starting with the Aand T  
characters and ending with a special end-of-line character, <CR>. Characters  
typed before the ATare ignored. Command lines contain, at most, 40 characters  
after the AT. The modem does not execute any of the commands in a command  
line that is too long.  
To echo command line characters, use the E1command.  
PS001907-0904  
AT Command Set