| 摘要 |
PURPOSE:To prevent the operating efficiency of a system from lowering in an equipment check, by disconnecting an equipment from a transmission line by providing an alternation switch between the transmission line and check terminal. CONSTITUTION:Respective multi-point scanners 21-2m obtaining measurement data about a temperature, etc., at a points by scanning, holds them after A/D conversion, and then sends the measurement data to transmission line (l) in response to a polling signal from main station 1, which processes this measurement data and sends processed data to line (l). While equipment 4 is being checked, contacts 83 and 84 of alternation switch 8 of switch part 5 are connected to contacts 85 and 86 to disconnect equipment 4 from line (l), and power is supplied to circuit part 6. Therefore, circuit part 6 and its relative parts can be checked in terms of operation and after the check, transmission and reception of data via line (l) becomes possible by changing contacts 83 and 84 over to contacts 81 and 82. |
