名词解释题RS-232
名词解释题
RS-232
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相关考题：
下面关于RS-232和RS-485的叙述中，正确的是（）。A、RS-485采用负逻辑传输：+3V~+15V时为逻辑0，-15V~-3V时为逻辑1B、RS-232采用差分信号传输方式C、RS-485的传输距离比RS-232远D、RS-232的传输速率比RS-485高
A pSeries technical specialist is performing a solutions assurance with a customer for a new single-frame 10-node p655 system being attached to a currently installed HMC. Which of the following questions should be asked to gather all the required information to determine whether the p655 solution can connect to the HMC？（）A、Are there at least ten RS-232 ports available on the HMC？B、Are there at least ten RS-422 ports available on the HMC？C、Are there at least ten RS-232 and two RS-422 ports available on the HMC？D、Are there at least two RS-232 and ten RS-422 ports available on the HMC？
RS-232（ANSI/EIA-232标准）是IBM-PC及其兼容机上的串行连接标准，RS-232只限于PC串口和设备间点对点的通信。RS-232针脚（9针）的功能：TXD串口数据输出是第3针脚，RXD串口数据输入是第2 针脚，而第5针脚是它的（）。A、电源正极B、电源负极C、接地端
下列选项中说法正确的是（）。A、集线器是将TTY通讯方式转换为RS-232通讯方式B、集线器端口损坏不会导致通讯故障C、RS-232与电流环的通讯方式是相同的D、RS-232与电流环的接口不一样
Which of the following should a technician MOST likely use to test a RS-232 port?（）A、Loopback adapterB、Power supply testerC、The ping commandD、Multimeter
单选题下面关于UART、RS-232、RS-485的叙述中，错误的是（）。A基于UART可以构成RS-232接口和RS-485接口BRS-485接口标准的最长通信距离与RS-232接口标准的最长通信距离相当CRS-485标准采用差分信号传输方式，因此具有很强的抗共模干扰能力D通过RS-485可构成主从式多机通信系统，主机可采用轮询方式与各从机建立通信连接
单选题Which of the following should a technician MOST likely use to test a RS-232 port?（）ALoopback adapterBPower supply testerCThe ping commandDMultimeter
单选题A pSeries technical specialist is performing a solutions assurance with a customer for a new single-frame 10-node p655 system being attached to a currently installed HMC. Which of the following questions should be asked to gather all the required information to determine whether the p655 solution can connect to the HMC？（）AAre there at least ten RS-232 ports available on the HMC？BAre there at least ten RS-422 ports available on the HMC？CAre there at least ten RS-232 and two RS-422 ports available on the HMC？DAre there at least two RS-232 and ten RS-422 ports available on the HMC？
名词解释题RS-232接口