PROBLEM TO BE SOLVED: To provide a communication system for agricultural work machines, which can be applied to agricultural work machines mounted on a tractor and has higher versatility of communication. SOLUTION: A communication conversion device 12 that can communicate with an operation unit 11 that can be arranged in the tractor 1 and that is installed in the tractor 1, an actuator 23 that is installed in the agricultural work machine 2, and data based on the operation of the operation unit 11. And a control unit 21 capable of communicating with the communication conversion device 12 by controlling the actuator 23 by means of the first communication protocol and using the first communication protocol for communication between the operation unit 11 and the communication conversion device 12. The second communication protocol is used between the units 21, and the communication conversion device 12 changes the first communication protocol to the second communication protocol when receiving the data from the operation unit 11 and transmitting the data to the control unit 21. Convert. [Selection diagram] Figure 1【課題】トラクタに装着する農作業機に適用できて通信の汎用性をより高くした農作業機用通信システムを提供することを目的とする。【解決手段】トラクタ１に配置可能な操作部１１との通信が可能でトラクタ１に設置される通信変換装置１２と、農作業機２に設置されるアクチュエータ２３と、操作部１１の操作に基づくデータによりアクチュエータ２３を制御し通信変換装置１２と通信が可能な制御部２１とを備え、操作部１１と通信変換装置１２の間の通信は第１の通信プロトコルを使用し、通信変換装置１２と制御部２１の間は第２の通信プロトコルを使用し、通信変換装置１２は、操作部１１からのデータを受信し制御部２１へ送信するときは、第１の通信プロトコルから第２の通信プロトコルへ変換する。【選択図】図１
