| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a phenomenon that a system is operated in a state that a device unsuitable for the specification of the system is connected, or that the system is operated in a state that power supply is not operated to the terminator of the device due to failure by allowing a user side to easily recognizes that the power supply from a terminator powerunit(TERMPWR) line is not operated. SOLUTION: In an SCSI system, an SCSI device 3T having a terminator 30 is provided with a power source monitoring circuit 37 for monitoring power supply from a TERMPWR line. The power source monitoring circuit 37 monitors a power supply voltage from the TERMPWR line, and outputs a control signal when the power supply voltage is less than a reference level for allowing an LED 3 for alarming to turn on and to operate alarm display. Thus, a user can confirm that the power supply from the TERMPWR line is turned into a stopped state.</p> |
