| 摘要 |
PURPOSE:To make easy the test from the master station, by giving the control instruction from the master to the slave station, which makes communication among the slave stations for test, performing the communication among the slave stations for test in response of the slave station to the instruction, and monitoring the communication among the slave stations with the master station. CONSTITUTION:The master station 2 and a plurality of slave stations 3-1-3-N are connected with the transmission line 4 of loop shape, and the control table 1 is connected to the master station 2. The master station 2 and the slave stations 3-1-3-N are respectively provided with the transmission sections 2a, 3a-1-3a-N, reception sections 2b, 3b-1-3b-N and the processing sections 2c, 3c-1-3c-N. Further, to one direction of the transmission line 4, the word 10 having the data code 10F is transmitted from the synchronizing signal 10A, the slave stations 3-1- 3-N receive the word 10 and reproduce the word 10 as it is or with modification to enable to transmit it to the transmission line 4 again. Further, the communication among the slave stations for test is made with the word 10, and the communication among the slave stations can be made to monitor at the master station 2, and the normal performance of the communication of information among the slave stations can be tested. |
