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介绍一种既可以利用双音频电话进行“数据收发”，又不影响其“语音通话”功能的复用型双音多频（DTMF）数据收发器，给出了复用的原理，通信接口电路及数据发送、接收软件流程。这种数据收发器适用于远程测控系统中的数据传送。
A dual-tone multi-frequency (DTMF) data transceiver that can perform “data transceiving” using dual-tone phones without affecting the “voice call” function is introduced. The principle of multiplexing is given. The communication interface circuit And data transmission, receiving software processes. This kind of data transceiver is suitable for the data transmission in the long-distance observation and control system.