IC660EBD025
IC660EBD025
IC660EBD025
單工形式一般用在只向一個方向傳送數據的場合。如計算機與打印機之間的通信是單工形式，因為只有計算機向打印機傳送數據，而沒有相反的數據傳送。還有在某些通信信道中，如單工無線發(fā)送等。
2．半雙工形式：RS-485
半雙工通信使用同一根傳輸線，即可發(fā)送數據又可接收數據，但不能同時發(fā)送和接收。在任何時刻只能由其中的一方發(fā)送數據，另一方接收數據。因此半雙工形式即可以使用一條數據線，也可以使用兩條數據線，如圖４所示。
半雙工通信中每端需有一個收/發(fā)切換電子開關，通過切換來決定數據向哪個方向傳輸。因為有切換，所以會產生時間延遲，信息傳輸效率低些。但是對于像打印機這樣單方向傳輸的外圍設備，用半雙工方式就能滿足要求了，不必采用全雙工方式，可省一根傳輸線。
波仕電子的RS-232/RS-485轉換器使用了獨特的零延時自動收發(fā)轉換技術，直接從RS-485信號中用硬件方法提取收發(fā)切換控制信號，并且具備零延時的性能。零延時指收發(fā)切換過程轉變時間為0，在使用時與RS-232通信一樣。
3．全雙工形式：RS-232、RS-422
全雙工數據通信分別由兩根可以在兩個不同的站點同時發(fā)送和接收的傳輸線進行傳送，通信雙方都能在同一時刻進行發(fā)送和接收操作，如圖５所示。
在全雙工方式中，每一端都有發(fā)送器和接收器，有兩條傳送線，可在交互式應用和遠程監(jiān)控系統(tǒng)中使用，信息傳輸效率較高。
三 異步傳輸與同步傳輸
串行傳輸中，數據是一位一位按照到達的順序依次傳輸的，每位數據的發(fā)送和接收都需要時鐘來控制。發(fā)送端通過發(fā)送時鐘確定數據位的開始和結束，接收端需要在適當的時間間隔對數據流進行采樣來正確的識別數據。接收端和發(fā)送端必須保持步調一致，否則數據傳輸就會出現差錯。為了解決以上問題，串行傳輸可采用以下兩種方法：異步傳輸和同步傳輸。
AMD Opteron DC Processor 8222 3.0GHZ OSA8222GAA6CY
Dell T710 Intel Xeon E5640 2.66GHZ CPU Kit T710 E5640
Dell T410 Intel Xeon E5640 2.66GHZ CPU Kit T410 E5640
Dell PowerEdge M610 Intel Xeon E5640 2.66GHZ CPU Kit
Dell R610 Intel Xeon E5640 2.66GHZ CPU Kit R610 E5640
HP DL160 G6 Intel Xeon E5640 2.66GHZ CPU Kit 589715-B21
HP Z600 / Z800 Intel Xeon E5640 2.66GHZ CPU Kit WG730AA
AMD Opteron QC Processor 2356 2.3GHZ OS2356WAL4BGD
Dell R710 Intel Xeon L5640 2.26GHZ CPU Kit R710 L5640
Dell T710 Intel Xeon L5640 2.26GHZ CPU Kit T710 L5640
Dell R510 Intel Xeon L5640 2.26GHZ CPU Kit R510 L5640
AMD Opteron QC Processor 2384 2.7GHZ OS2384WAL4DGI
Dell R410 Intel Xeon L5640 2.26GHZ CPU Kit R410 L5640
Dell M710 Intel Xeon L5640 2.26GHZ CPU Kit M710 L5640
Dell PowerEdge M610 Intel Xeon L5640 2.26GHZ CPU Kit
Dell T410 Intel Xeon L5640 2.26GHZ CPU Kit T410 L5640
Dell R610 Intel Xeon L5640 2.26GHZ CPU Kit R610 L5640
Intel Xeon Quad Core Processor X3320 2.50GHZ SLAWF
Intel Xeon Quad Core Processor X3450 2.66GHZ SLBLD
Dell T710 Intel Xeon X5677 3.46GHZ CPU Kit T710 X5677
Dell R710 Intel Xeon X5677 3.46GHZ CPU Kit R710 X5677
Intel Xeon Quad Core Processor X3430 2.40GHZ SLBLJ
Compaq Redundant VRM PL80/85 12V 48W 312257-001
WD 300GB 10K RPM SATA 2.5 Inch Hard Drive WD3000BLFS
Intel Xeon Quad Core Processor E5640 2.66GHZ SLBVC
Intel Xeon 6 Core Processor L5640 2.26GHZ SLBV8
HP Compaq Genuine 105 Watt VRM for XW6000 332497-001
Dell M610 Intel Xeon L5530 2.40GHZ CPU Kit M610 L5530
Dell T710 Intel Xeon L5530 2.40GHZ CPU Kit T710 L5530
HP DL360 G5 Intel Xeon L5530 2.40GHZ CPU Kit 583379-B21
Dell R510 Intel Xeon L5530 2.40GHZ CPU Kit R510 L5530
HP Compaq Proliant 40W VRM 327660-001
HP Compaq Proliant 40W VRM 327660-001
HP Compaq VRM 75W 60A LTN for Evo W8000 239327-001
HP Compaq VRM 40W for DDL360-G2L 237553-001
Dell R710 Intel Xeon L5530 2.40GHZ CPU Kit R710 L5530
Dell R410 Intel Xeon L5530 2.40GHZ CPU Kit R410 L5530
Dell M710 Intel Xeon L5530 2.40GHZ CPU Kit M710 L5530
HP Compaq VRM 40W for DDL360-G2L 237553-001
Dell R610 Intel Xeon L5530 2.40GHZ CPU Kit R610 L5530
HP Compaq Proliant 1850 3000 5500 VRM 329267-001
VXI Electronics VRM Pentium III XEON 073-20740-20
HP VRM for HP DL585 DL385 G1 383337-001
IBM 95P3681/95P3933 400/800GB Ultrium LTO-3 SCSI LVD HH
DELL NP052 400/800GB Ultrium LTO-3 SCSI LVD HH Internal
HP Proliant BL460c Dual Xeon E5345 2.33GHZ 4GB RAM
HP Proliant BL460c Xeon E5345 2.33GHZ 4GB RAM 1X146GB
HP COMPAQ Smart Array 431 SCSI Controller 143886-001
Dell Drac II Remote Access Card 743NE
Dell Perc3 Quad Channel Raid Controller 9M905
Dell M1000e 2 x M710 Dual Xeon X5670 32GB RAM 4x300GB
Dell M1000e 2 x M710 Dual Xeon X5670 64GB RAM 4x300GB
Dell M1000e 2 x M710 Dual Xeon X5670 96GB RAM 4x300GB
Dell M1000e 2 x M710 Dual Xeon X5670 144GB RAM 4x300GB
Dell M1000e 2 x M710 Dual Xeon X5670 32GB RAM 2x146GB
Dell M1000e 2 x M710 Dual Xeon X5670 64GB RAM 2x146GB
HP Compaq SmartArray 2DH PCI RAID Controller 295243-001
Dell M1000e 2 x M710 Dual Xeon X5670 96GB RAM 2x146GB
Dell M1000e 2 x M710 Dual Xeon X5670 144GB RAM 2x146GB
Dell M1000e 2 x M710 Dual Xeon X5670 32GB RAM 4x146GB
Dell M1000e 2 x M710 Dual Xeon X5670 64GB RAM 4x146GB
Dell M1000e 2 x M710 Dual Xeon X5670 96GB RAM 4x146GB
Dell M1000e 2 x M710 Dual Xeon X5670 144GB RAM 4x146GB
HP Compaq Smart Array 3200 PCI SCSI Raid 340855-001
HP VRM For Proliant DL380 ML370 G4 347884-001
HP VRM For Proliant DL380 ML350 ML370 G4 347884-001
Dell M1000e 4 x M710 Dual Xeon X5670 32GB RAM 2x300GB
Dell M1000e 4 x M710 Dual Xeon X5670 64GB RAM 2x300GB
ACULAB AC6191_152 PCI Card With AC6132 PM4-T1
Dell M1000e 4 x M710 Dual Xeon X5670 96GB RAM 2x300GB
Dell M1000e 4 x M710 Dual Xeon X5670 144GB RAM 2x300GB
Dell M1000e 4 x M710 Dual Xeon X5670 32GB RAM 4x300GB
Dell M1000e 4 x M710 Dual Xeon X5670 64GB RAM 4x300GB
Dell M1000e 4 x M710 Dual Xeon X5670 96GB RAM 4x300GB
Dell M1000e 4 x M710 Dual Xeon X5670 144GB RAM 4x300GB
HP Compaq NETRAID 3 SI PCI Array Card D5955
Dell PowerEdge M1000e M610x16 1x E5520 Blade Enclosure
DellPowerEdge M1000e M610x16 2x E5520 Blade Enclosure
IBM HS22 Intel Xeon X5680 3.33GHZ CPU Kit 59Y5713
HP SL170Z G6 Intel Xeon X5680 3.33GHZ Kit 592019-B21
Dell PowerEdge M1000e M610x16 2x X5550 Blade Enclosure
Dell M710 24GB Memory Kit DDR3 PC3-10600R RAM (6 X 4GB)
DELL R610 24GB Memory Kit DDR3 PC3-10600R RAM (6 X 4GB)
Dell M1000e 4 x M710 Dual Xeon X5670 32GB RAM 2x146GB
Dell M1000e 4 x M710 Dual Xeon X5670 64GB RAM 2x146GB
Dell M1000e 4 x M710 Dual Xeon X5670 96GB RAM 2x146GB
Dell M1000e 4 x M710 Dual Xeon X5670 144GB RAM 2x146GB
Dell M1000e 4 x M710 Dual Xeon X5670 32GB RAM 4x146GB
Dell M1000e 4 x M710 Dual Xeon X5670 64GB RAM 4x146GB
Dell M1000e 4 x M710 Dual Xeon X5670 96GB RAM 4x146GB
Dell M1000e 4 x M710 Dual Xeon X5670 144GB RAM 4x146GB
Dell R710 36GB Memory Kit DDR3 PC3-8500R RAM (9 X 4GB)
Dell M710 36GB Memory Kit DDR3 PC3-8500R RAM (9 X 4GB)
Dell T710 36GB Memory Kit DDR3 PC3-8500R RAM (9 X 4GB)
Dell M710 36GB Memory Kit DDR3 PC3-8500R RAM (9 X 4GB)
Dell R710 36GB Memory Kit DDR3 PC3-10600R RAM (9 X 4GB)
Dell T710 36GB Memory Kit DDR3 PC3-10600R RAM (9 X 4GB)
Dell M610 40GB Memory Kit DDR3 PC3-8500R RAM (10 X 4GB)
Dell R710 40GB Memory Kit DDR3 PC3-8500R RAM (10 X 4GB)
Dell M710 40GB Memory Kit DDR3 PC3-8500R RAM (10 X 4GB)
DELL T710 40GB Memory Kit DDR3 PC3-8500R RAM (10 X 4GB)
DELL T610 40GB Memory Kit DDR3 PC3-8500R RAM (10 X 4GB)
DELL R610 40GB Memory Kit DDR3 PC3-8500R RAM (10 X 4GB)
Dell M1000e 8 x M710 Dual Xeon X5670 32GB RAM 2x300GB
Dell M1000e 8 x M710 Dual Xeon X5670 64GB RAM 2x300GB
Dell M1000e 8 x M710 Dual Xeon X5670 96GB RAM 2x300GB
Dell M1000e 8 x M710 Dual Xeon X5670 144GB RAM 2x300GB
Dell M1000e 8 x M710 Dual Xeon X5670 32GB RAM 4x300GB
Dell M1000e 8 x M710 Dual Xeon X5670 64GB RAM 4x300GB
Dell M1000e 8 x M710 Dual Xeon X5670 96GB RAM 4x300GB
Dell M1000e 8 x M710 Dual Xeon X5670 144GB RAM 4x300GB
Dell M1000e 8 x M710 Dual Xeon X5670 32GB RAM 2x146GB
Dell M1000e 8 x M710 Dual Xeon X5670 64GB RAM 2x146GB
Dell M1000e 8 x M710 Dual Xeon X5670 96GB RAM 2x146GB
Dell M1000e 8 x M710 Dual Xeon X5670 144GB RAM 2x146GB
Dell M1000e 8 x M710 Dual Xeon X5670 32GB RAM 4x146GB
Dell M1000e 8 x M710 Dual Xeon X5670 64GB RAM 4x146GB
Dell M1000e 8 x M710 Dual Xeon X5670 96GB RAM 4x146GB
Dell M1000e 8 x M710 Dual Xeon X5670 144GB RAM 4x146GB
DELL M610 48GB Memory Kit DDR3 PC3-8500R RAM (12 X 4GB)
Dell R710 48GB Memory Kit DDR3 PC3-8500R RAM (12 X 4GB)
Dell M710 48GB Memory Kit DDR3 PC3-8500R RAM (12 X 4GB)
Dell T710 48GB Memory Kit DDR3 PC3-8500R RAM (12 X 4GB)
Dell T610 48GB Memory Kit DDR3 PC3-8500R RAM (12 X 4GB)
Dell R610 48GB Memory Kit DDR3 PC3-8500R RAM (12 X 4GB)
Dell R410 48GB Memory Kit DDR3 PC3-8500R RAM (12 X 4GB)
Dell R710 56GB Memory Kit DDR3 PC3-8500R RAM (14 X 4GB)
Dell M710 56GB Memory Kit DDR3 PC3-8500R RAM (14 X 4GB)
Dell T710 56GB Memory Kit DDR3 PC3-8500R RAM (14 X 4GB)
Dell R710 64GB Memory Kit DDR3 PC3-10600R RAM (16x4GB)
Dell M710 64GB Memory Kit DDR3 PC3-10600R RAM (16x4GB)
Dell T710 64GB Memory Kit DDR3 PC3-10600R RAM (16x4GB)
Dell M710 72GB Memory Kit DDR3 PC3-10600R RAM (18x4GB)
Dell T710 72GB Memory Kit DDR3 PC3-10600R RAM (18x4GB)
Dell R710 72GB Memory Kit DDR3 PC3-10600R RAM (18x4GB)
Dell R410 8GB Memory Kit DDR3 PC3-8500R RAM (2 X 8GB)
Dell M610 8GB Memory Kit DDR3 PC3-8500R RAM (2 X 8GB)
Dell T410 8GB Memory Kit DDR3 PC3-8500R RAM (2 X 8GB)
Dell R710 8GB Memory Kit DDR3 PC3-8500R RAM (2 X 8GB)
Dell M710 8GB Memory Kit DDR3 PC3-8500R RAM (2 X 8GB)
Dell R510 8GB Memory Kit DDR3 PC3-8500R RAM (2 X 8GB)
Dell T710 8GB Memory Kit DDR3 PC3-8500R RAM (2 X 8GB)
Dell T610 8GB Memory Kit DDR3 PC3-8500R RAM (2 X 8GB)
Dell R610 8GB Memory Kit DDR3 PC3-8500R RAM (2 X 8GB)
Dell R410 32GB Memory Kit DDR3 PC3-8500R RAM (4 X 8GB)
Dell T710 32GB Memory Kit DDR3 PC3-8500R RAM (4 X 8GB)
Dell R710 40GB Memory Kit DDR3 PC3-8500R RAM (5 X 8GB)
Dell M710 40GB Memory Kit DDR3 PC3-8500R RAM (5 X 8GB)
Dell M610 48GB Memory Kit DDR3 PC3-8500R RAM (6 X 8GB)
Dell T410 48GB Memory Kit DDR3 PC3-8500R RAM (6 X 8GB)
Dell R710 48GB Memory Kit DDR3 PC3-8500R RAM (6 X 8GB)
Dell M710 48GB Memory Kit DDR3 PC3-8500R RAM (6 X 8GB)
Dell R510 48GB Memory Kit DDR3 PC3-8500R RAM (6 X 8GB)
Dell T710 48GB Memory Kit DDR3 PC3-8500R RAM (6 X 8GB)
Dell T610 48GB Memory Kit DDR3 PC3-8500R RAM (6 X 8GB)
Dell R610 48GB Memory Kit DDR3 PC3-8500R RAM (6 X 8GB)
Dell R410 64GB Memory Kit DDR3 PC3-8500R RAM (8 X 8GB)
Dell M610 64GB Memory Kit DDR3 PC3-8500R RAM (8 X 8GB)
Dell T410 64GB Memory Kit DDR3 PC3-8500R RAM (8 X 8GB)
Dell R710 64GB Memory Kit DDR3 PC3-8500R RAM (8 X 8GB)
Dell M710 64GB Memory Kit DDR3 PC3-8500R RAM (8 X 8GB)
Dell R510 64GB Memory Kit DDR3 PC3-8500R RAM (8 X 8GB)
Dell T710 64GB Memory Kit DDR3 PC3-8500R RAM (8 X 8GB)
Dell T610 64GB Memory Kit DDR3 PC3-8500R RAM (8 X 8GB)
Dell R610 64GB Memory Kit DDR3 PC3-8500R RAM (8 X 8GB)
Dell R710 80GB Memory Kit DDR3 PC3-8500R RAM (10 X 8GB)
Dell M610 80GB Memory Kit DDR3 PC3-8500R RAM (10 X 8GB)
Dell M710 80GB Memory Kit DDR3 PC3-8500R RAM (10 X 8GB)
Dell T710 80GB Memory Kit DDR3 PC3-8500R RAM (10 X 8GB)
Dell T610 80GB Memory Kit DDR3 PC3-8500R RAM (10 X 8GB)
Dell R610 80GB Memory Kit DDR3 PC3-8500R RAM (10 X 8GB)
Dell M610 96GB Memory Kit DDR3 PC3-8500R RAM (12 X 8GB)
Dell R710 96GB Memory Kit DDR3 PC3-8500R RAM (12 X 8GB)
Dell T710 96GB Memory Kit DDR3 PC3-8500R RAM (12 X 8GB)
Dell M710 96GB Memory Kit DDR3 PC3-8500R RAM (12 X 8GB)
Dell T610 96GB Memory Kit DDR3 PC3-8500R RAM (12 X 8GB)
Dell R610 96GB Memory Kit DDR3 PC3-8500R RAM (12 X 8GB)
Dell R710 112GB Memory Kit DDR3 PC3-8500R RAM (14x8GB)
Dell M1000e 8 x M710 Dual Xeon X5650 32GB RAM 2x300GB
Dell M1000e 8 x M710 Dual Xeon X5650 64GB RAM 2x300GB
Dell M1000e 8 x M710 Dual Xeon X5650 96GB RAM 2x300GB
Dell M1000e 8 x M710 Dual Xeon X5650 144GB RAM 2x300GB
Dell M1000e 8 x M710 Dual Xeon X5650 32GB RAM 4x300GB
Dell M1000e 8 x M710 Dual Xeon X5650 64GB RAM 4x300GB
Dell M1000e 8 x M710 Dual Xeon X5650 96GB RAM 4x300GB
Dell M1000e 8 x M710 Dual Xeon X5650 144GB RAM 4x300GB
Dell M1000e 8 x M710 Dual Xeon X5650 32GB RAM 2x146GB
Dell M1000e 8 x M710 Dual Xeon X5650 64GB RAM 2x146GB
Dell M1000e 8 x M710 Dual Xeon X5650 96GB RAM 2x146GB
Dell M1000e 8 x M710 Dual Xeon X5650 144GB RAM 2x146GB
Dell M1000e 8 x M710 Dual Xeon X5650 32GB RAM 4x146GB
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