<br />××××××××××××××××××××××××××××××××××××××××××<br />RJ-MODEM 脚位定义:<br />1 –RI O RING (Active Low). Incoming ring signal from phone.<br /> Ring Indicate. –RI output ON (low) indicates the presence of an ON segment of a<br /> ring signal on the telephone line. The modem will not go off-hook when –RI is active;<br /> the modem waits for –RI to go inactive before going off-hook.<br />2 –DCD O Data Carrier Detect (Active Low). –DCD output is ON (low) when a data<br /> connection is established and the module is ready to send/receive data.<br />3 –DTR I Data Terminal Ready (Active Low). The –DTR input is turned ON (low) when the<br /> DTE is ready to communicate. –DTR ON prepares the modem to be connected, and,<br /> once connected, maintains the connection. –DTR OFF places the modem in the<br /> disconnect state under control of the &Dn and &Qn commands.<br />6 –CTS O Clear to Send (Active Low). –CTS is controlled by the module to indicate whether or<br /> not the module is ready to transmit data. –CTS ON indicates to the DTE that signals<br /> on TXD will be transmitted. –CTS OFF indicates to the DTE that it should not transfer<br /> data on TXD.<br />7 –RTS I Request to Sent (Active Low). –RTS signal is used for hardware flow control. –RTS<br /> input ON (low) indicates that the DTE is ready to send data to the modem. In the<br /> command state, the modem ignores –RTS.<br />8 TXCLK O Transmit Data Sync Clock. TX synchronous data clock for sync data mode.<br />9–TXD I Transmitted Data. The DTE uses the –TXD line to send data to the module for<br /> transmission or to transmit commands to the module. The DTE should hold this<br /> circuit in the mark state when no data is being transmitted or during between intervals<br /> between characters.<br />10 –RXD O Received Data. The module uses the RXD line to send data to the DTE and to send<br /> module responses to the DTE. In command mode, –RXD data presents the module<br /> responses to the DTE. Module responses take priority over incoming data when the<br /> two signals are in competition for –RXD. When no data is transmitted, the signal is<br /> held in mark condition.<br />13 SPKR Speaker. Call Progress signaling on MT5656RJ is a square wave output that can be<br /> optionally connected to a low-cost single-ended speaker; e.g., a sounducer or an<br /> analog speaker circuit.<br />14 RXCLK I Receive Data Sync Clock. RX synchronous data clock for sync data mode.<br /><br />××××××××××××××××××××××××××××××××××××××××××<br />如附图中,是系统的示意图,有“A型”,和“B型”。<br /><br />A型:<br /> 目前连接已通过,工作正常。<br /> 连接AT命令:<br /> AT&F '恢复出厂设置'<br /> ATE1 '打开回显'<br /> ATX3 '禁止'MODEM'对盲音和拨号音的检测'<br /> ATD '开始连接'<br /><br />B型:<br /> 问题就在B型的“RJ_Modem”上.<br /> 我先对‘RJ-Modem’初始化:<br /> <font color=#FF0040>1)设置DTR,RTS为低电平。<br /> 2)输入以下命令:</font><br /> AT&F '恢复出厂设置'<br /> ATE1 '打开回显'<br /> ATX3 '禁止'MODEM'对盲音和拨号音的检测'<br /> 然后输入连接命令:<br /> ATD '开始连接'<br /> <br /><br />我用'ARM'发送'AT'命令给“RJ_Modem”如果发送无需连接的AT指令,如:AT;AT&F;AT&Y0;AT&Z0=12345; RJ_Modem都能正常运行(返回OK<br /><br />),但是运行命令:'ATD'(拨号命令) 或者 'ATA'(手工应答),在电话线上监测不到信号(用超级终端在PC机上往TP-LINK-MODEM<br /><br />发'ATD'或'ATA'时,可以在电话线上可以检测到信号),但是可以检测到'RJ-Modem'的13脚(SPEKR)有信号。<br /><br /> 请大家提提看法,看看哪里出了问题?是初始化部分还是那里出了问题? |
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