电脑主机后面接口比较多,很多人可能分不清各接口都分别起什么作用和怎么接线,下面就来说说各接口作用及连接方法。 1、电源接口:用于连接220V电的接口。2、 键盘鼠标接口(PS/2接口)注意紫色的圆形接口为键盘接口,绿色的圆形接口为鼠标接口。如果你的键盘是紫色的圆形插头,请一定要插到紫色的接口上,另外还要注意分清方向哦,插错会导致键盘损坏。如果你的键盘和鼠标都是USB接口,那么可随意插入主机下面任一USB接口上。PS/2接口连接数据线是这个样子的: 键盘接口
键盘接口为 5 针母插座,引脚定义为:
Pin | Name | Description | Technical | 1 | CLOCK | Clock | CLK/CTS, Open-collector | 2 | DATA | Data | RxD/TxD/RTS, Open-collector | 3 | n/c | Not connected | Reset on some very old keyboards. | 4 | GND | Ground |
| 5 | VCC | +5 VDC |
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PS/2 接口 PS/2 鼠标/键盘接口为 6 针母插,引脚定义为:
Pin | Name | Dir | Description | 1 | DATA |
| Key Data | 2 | n/c | - | Not connected | 3 | GND |
| Gnd | 4 | VCC |
| Power , +5 VDC | 5 | CLK |
| Clock | 6 | n/c | - | Not connected |
3、 显卡接口(VGA显示器接口和DVI显示器接口)为蓝色15孔D形接口,接显示器信号连接线。有两点一定注意:一是此接口为字母D形,一边大一边小,对应显示器信号线的15针D形插头,插入时注意分清方向;二是若电脑带有独立显卡,显示器一定要接到独立显卡上,否则显示器无显示。独立显卡在主机靠下方,一般有一个蓝色15孔VGA接口和一个白色24孔DVI接口,根据显示器信号线类型插入对应插孔。VGA接口:输出视频信号(模拟信号)。 DVI接口:输出视频信号(数字信号)。 VGA连接数据线是这个样子的: DVI接口是这个样子的:15针VGA 显卡接口 VGA 是 Video Graphics Adapter 的缩写,信号类型为模拟类型,显示卡端的接口为 15 针母插座,引脚定义为:
Pin | Name | Dir | Description | 1 | RED |
| Red Video (75 ohm, 0.7 V p-p) | 2 | GREEN |
| Green Video (75 ohm, 0.7 V p-p) | 3 | BLUE |
| Blue Video (75 ohm, 0.7 V p-p) | 4 | ID2 |
| Ground | 5 | GND |
| Ground | 6 | RGND |
| Red Ground | 7 | GGND |
| Green Ground | 8 | BGND |
| Blue Ground | 9 | KEY | - | Key | 10 | SGND |
| Sync Ground | 11 | ID0 |
| Ground | 12 | ID1 or SDA |
| SDA | 13 | HSYNC or CSYNC |
| Horizontal Sync (or Composite Sync) | 14 | VSYNC |
| Vertical Sync | 15 | ID3 or SCL |
| SCL |
4、 USB接口
该接口为通用,只要是USB设备可插入任意一个USB接口。现在最新的电脑上都带有USB 3.0接口,其颜色为蓝色,传输速度更快,使用时既可插入传统的USB2.0设备也可插入USB3.0设备,但只有在插入USB3.0设备时才会发挥速度优势。USB接口即插即用和热插拔功能。USB接口可连接百余种外设,如鼠标、键盘和打印机等。USB接口连接数据线是这个样子的: USB接口
USB 是 Universal Serial Bus 的缩写。外观上计算机一侧为 4 针公插,设备一侧为 4 针母插,引脚定义为:
Pin | Name | Description | 1 | VCC | +5 VDC | 2 | D- | Data - | 3 | D+ | Data + | 4 | GND | Ground |
5、 音频接口一般主机上有3个或6个音频输入输出接口。不管有多少个,记住以下三个:麦克风接口(红色):用于连接麦克风的接口。音频输入端(蓝色):可将CD机、录音机等的音频信号输入计算机,进行音频编辑。音箱接口(绿色):用于连接两声道音箱、耳机的接口。 音频接口连接数据线是这个样子的:6、网络接口 RJ-45以太网接口,传输速率通常10M/100/1000Mbps,现在主流为100Mbps和1000Mbps。
RJ45 接口(以太网10/100Base-T ) 网卡(或板载网卡)上RJ45接口(以太网 10-100Base-T )的外观为 8 芯母插座 (RJ45),引脚定义为:
Pin | Name | Description | 1 | TX_D1+ | Tranceive Data+ | 2 | TX_D1- | Tranceive Data- | 3 | RX_D2+ | Receive Data+ | 4 | BI_D3+ | Bi-directional Data+ | 5 | BI_D3- | Bi-directional Data- | 6 | RX_D2- | Receive Data- | 7 | BI_D4+ | Bi-directional Data+ | 8 | BI_D4- | Bi-directional Data- |
7、 串口与并口9针的D形接口为串口,接老式设备,25孔红色D形接口为并口,接老式打印机及其它设备用,平时基本用不上,很多电脑上已没有此接口。9针串口(不包括主板插座引脚) PC 机上的9针串行口是 9 针公插座,引脚定义为:
Pin | Name | Dir | Description | 1 | CD |
| Carrier Detect | 2 | RXD |
| Receive Data | 3 | TXD |
| Transmit Data | 4 | DTR |
| Data Terminal Ready | 5 | GND |
| System Ground | 6 | DSR |
| Data Set Ready | 7 | RTS |
| Request to Send | 8 | CTS |
| Clear to Send | 9 | RI |
| Ring Indicator |
25针串口 PC 机上的25针串口为25针公插,引脚定义为:
Pin | Name | Dir | Description | 1 | GND |
| Shield Ground | 2 | TXD |
| Transmit Data | 3 | RXD |
| Receive Data | 4 | RTS |
| Request to Send | 5 | CTS |
| Clear to Send | 6 | DSR |
| Data Set Ready | 7 | GND |
| System Ground | 8 | CD |
| Carrier Detect | 9 | - | - | RESERVED | 10 | - | - | RESERVED | 11 | STF |
| Select Transmit Channel | 12 | S.CD |
| Secondary Carrier Detect | 13 | S.CTS |
| Secondary Clear to Send | 14 | S.TXD |
| Secondary Transmit Data | 15 | TCK |
| Transmission Signal Element Timing | 16 | S.RXD |
| Secondary Receive Data | 17 | RCK |
| Receiver Signal Element Timing | 18 | LL |
| Local Loop Control | 19 | S.RTS |
| Secondary Request to Send | 20 | DTR |
| Data Terminal Ready | 21 | RL |
| Remote Loop Control | 22 | RI |
| Ring Indicator | 23 | DSR |
| Data Signal Rate Selector | 24 | XCK |
| Transmit Signal Element Timing | 25 | TI |
| Test Indicator |
25针并口 PC机上的并行接口外观是 25 针母插座,引脚定义为:
Pin | Name | Dir | Description | 1 | /STROBE |
| Strobe | 2 | D0 |
| Data Bit 0 | 3 | D1 |
| Data Bit 1 | 4 | D2 |
| Data Bit 2 | 5 | D3 |
| Data Bit 3 | 6 | D4 |
| Data Bit 4 | 7 | D5 |
| Data Bit 5 | 8 | D6 |
| Data Bit 6 | 9 | D7 |
| Data Bit 7 | 10 | /ACK |
| Acknowledge | 11 | BUSY |
| Busy | 12 | PE |
| Paper End | 13 | SEL |
| Select | 14 | /AUTOFD |
| Autofeed | 15 | /ERROR |
| Error | 16 | /INIT |
| Initialize | 17 | /SELIN |
| Select In | 18 | GND |
| Signal Ground | 19 | GND |
| Signal Ground | 20 | GND |
| Signal Ground | 21 | GND |
| Signal Ground | 22 | GND |
| Signal Ground | 23 | GND |
| Signal Ground | 24 | GND |
| Signal Ground | 25 | GND |
| Signal Ground |
8、电源散热口:主机变压器散热扇的出风口,为了保证散热,出风口应与墙面保持10厘米以上的间隙。 9、机箱散热口:主机箱散热风扇的出风口。 10、主机铭牌:用于记录厂家、型号、出厂编号等信息。 台式电脑主机背面接口介绍【详解】
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