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TML-NET is our original data acquisition network to perform measurement control and data transfer as well as power supply using two-wire cable. Commands and data are transferred on the network with clock signal, and bidirectional communication is possible. Network modules are placed near sensors such as strain gauge, DC voltage source and thermocouple, and measured data are converted into digital form by the network mudules. The network modules transmit those digitized data through the network, and the data are received by a data logger via a network driver which is connected to the network. It is also possible that a PC to directly receive data from the network by connecting a network interface to the network. Unlike ordinary analog measurement system, there is no sensitivity drop due to influence of cable extension and insulation lowering. Therefore, long term stable measurement is acheived. The TML-NET is also available in 4-wire system, in which two wires are used for data transfer while another two wires are used for power supply. In addition, the use of a network handheld strainmeter makes on-site data acquisition and checking possible.