Japan (2019), Vol. 71, No. 6 118-9 Fig. 7. Hardware block diagram of OAOWFC, which consists of 15 subsystems with communication capabilities; rounded rectangles with light-gray background show the subsystems, and strings at the upper-left corner describe their role. The structure is composed of three columns: network- attached PC/appliance, the controller, and the devices, arranged from left to right. TS stands for the terminal server, a Linux-based appliance used to convert messages from serial to TCP/IP or vice versa. PDU stands for the power distribution unit, arranged to restart a subsystem remotely if an Downloaded from https://academic.oup.com/pasj/article-abstract/71/6/118/5613951 by National As 25