名稱:工程設(shè)備CAN總線控制系統(tǒng)設(shè)計
1引言
工程設(shè)備的數(shù)字化、信息化及施工管理一體化是當(dāng)前工程設(shè)備的發(fā)展熱潮，自20世紀(jì)90年代始，發(fā)達國家的制造業(yè)就已經(jīng)開始進行相關(guān)技術(shù)的探索，*大量應(yīng)用于*的工程設(shè)備設(shè)計中。同時，以微計算機為代表的智能控制器被大量采用，智能節(jié)點間的信息流量*增加。將車載電子設(shè)備按照一定的協(xié)議聯(lián)網(wǎng)，并加以有效地信息綜合，使之達到資源和功能的共享已成為發(fā)展趨勢。
現(xiàn)場總線技術(shù)是指把單個分散的測量控制設(shè)備變成網(wǎng)絡(luò)節(jié)點，以現(xiàn)場總線為紐帶，把它們連接成可以相互溝通訊息、共同完成自控任務(wù)的網(wǎng)絡(luò)系統(tǒng)與控制系統(tǒng)。CAN（Controller Area Network）總線，又稱控制域局域網(wǎng)，屬于總線式串行通信網(wǎng)絡(luò)，zui早由BOSCH公司在80年代提出，由于可靠性高、實時性強、靈活方便，便于檢測維護，因而被廣泛應(yīng)用。在工程設(shè)備領(lǐng)域，美國CAT公司生產(chǎn)的CAT980G裝載機，日本小松的WA380-3和WA500-3，日本川崎的KLD80ZⅢ等均采用CAN總線技術(shù)，提高設(shè)備的整體控制技術(shù)水平。
根據(jù)CAN總線的技術(shù)特點，本文設(shè)計了一種基于CAN總線的工程設(shè)備控制系統(tǒng)，通過分布式智能控制來提高工程設(shè)備的控制技術(shù)和信息化水平。
2系統(tǒng)組成與功能特點
2.1系統(tǒng)組成
傳統(tǒng)的工程裝備控制系統(tǒng)采用集中式控制，除主控制器外一般都不具備可智能化的條件?；贑AN總線的控制系統(tǒng)采用分布式智能總線控制，將各功能模塊做成智能終端，再通過CAN總線連接，并輔之以一定的通訊協(xié)議，這樣不僅提高了整個系統(tǒng)的可靠性及智能化水平，同時降低了系統(tǒng)的復(fù)雜程度。
系統(tǒng)由主控制器、操縱盒、傳感器、執(zhí)行機構(gòu)和虛擬儀表等組成，各部件采用CAN總線互聯(lián)。主控制器負責(zé)系統(tǒng)的信息協(xié)調(diào)與處理；作業(yè)終端是作業(yè)手對作業(yè)過程進行干預(yù)的主要手段；傳感器負責(zé)感知系統(tǒng)的狀態(tài)；執(zhí)行器負責(zé)完成經(jīng)主控制器處理后的動作；虛擬儀表提供了一種可視化的人機界面，用文字或圖形的方式告知作業(yè)手器材當(dāng)前的狀態(tài)；調(diào)試診斷儀負責(zé)定位系統(tǒng)故障源。各模塊都是自成一體的智能終端，各模塊可以有多個，只要給它們分配不同的標(biāo)識符（ID號）即可，各模塊通過4芯屏蔽電纜并聯(lián)起來，4芯電纜中2根（電源正和電源負）用于給終端供電，另外2根（CANH和CANL）用于終端間通信。本系統(tǒng)組成如圖1所示。
圖1基于CAN總線的智能控制系統(tǒng)組成
總線的智能控制系統(tǒng)組成
2.2系統(tǒng)功能特點
與傳統(tǒng)的集中式控制系統(tǒng)相比，本控制系統(tǒng)具有如下功能特點：
（1）防誤操作功能。設(shè)計人員可以很容易地通過軟件編程屏蔽掉本系統(tǒng)中可能出現(xiàn)的誤操作，而只開放允許的操作，同時還可根據(jù)需要發(fā)出聲光報警，告知作業(yè)手有操作錯誤；
（2）作業(yè)向?qū)Чδ?。操縱盒的智能化和系統(tǒng)數(shù)據(jù)的共享使得設(shè)計人員可以根據(jù)作業(yè)過程，通過軟件編程點亮相應(yīng)的指示燈，告知作業(yè)手許可的操作。實現(xiàn)器材操作的“傻瓜”化；
（3）系統(tǒng)自我診斷自我恢復(fù)。智能化終端可以方便地對自身的狀態(tài)進行診斷，并向總線發(fā)送相關(guān)信息供其它智能節(jié)點處理用，使器材使用者不用掌握太多的專業(yè)知識就可以容易地判斷問題所在；同時對于總線內(nèi)部錯誤，總線系統(tǒng)可以通過自身軟件進行自動恢復(fù)
（4）狀態(tài)指示。通過虛擬儀表或操縱盒指示燈指示器顯示系統(tǒng)當(dāng)前狀態(tài)。
（5）數(shù)據(jù)共享，信息全面，可靠性高。系統(tǒng)的所有數(shù)據(jù)都可在CAN總線上接收到，可以很容易地實現(xiàn)信息共享，減少了數(shù)據(jù)的重復(fù)處理，降低了對主控制器的要求；同時CAN總線具有線間干擾孝抗*力強的特點。系統(tǒng)采用模塊化管理，各模塊按其功能分散布置，簡化了布線并縮短了線束的長度，從而降低了耦合電流的產(chǎn)生，減小了線間干擾。同時在軟件上，CAN總線采用短幀傳輸，這樣使總線數(shù)據(jù)報文在傳輸過程中有較強的抗*力；（6）擴充性強，產(chǎn)品升級快，性價比高。
（7）參數(shù)配置靈活。可以通過CAN總線進行參數(shù)配置，如開關(guān)量可以根據(jù)廠家需求設(shè)置其門限及控制極性(正負控)，模擬量可根據(jù)廠家提供的傳感器性能曲線進行校正，相關(guān)位置量也可以方便地進行總線標(biāo)定，縮短產(chǎn)品調(diào)試時間。
3總線通訊協(xié)議設(shè)計
CAN通信協(xié)議主要描述設(shè)備之間的基于基本CAN通信的應(yīng)用程序信息傳遞方式。CAN通信層的定義與開放系統(tǒng)互連（OSI）參考模型*，但只定義了zui下面兩層：物理層和數(shù)據(jù)鏈路層。由于沒有規(guī)定應(yīng)用層，因此CAN協(xié)議本身并不完整，需要一個應(yīng)用層協(xié)議來定義CAN報文中的標(biāo)識符（11/29位）、8字節(jié)數(shù)據(jù)的分配與使用。目前上使用較多的高層協(xié)議有CANopen、J1939和DeviceNet等，但是由于工程設(shè)備的控制節(jié)點一般不多，*可以根據(jù)自身特點，設(shè)計高效的應(yīng)用層協(xié)議。下面給出幾個實用的設(shè)計方法。
3.1報文ID的設(shè)計
在通信標(biāo)識符，即ID號分配時，對于關(guān)重信息幀或要求快速響應(yīng)的信息幀采用低號ID，如裝備控制中需要實時反饋信號的各作業(yè)機構(gòu)到位信號；對于傳遞僅用于監(jiān)測而不參與實時控制信號的信息幀應(yīng)采用高ID號，如油溫、油壓、車姿等狀態(tài)信息。
另外，在驗收濾波器中對驗收代碼寄存器（ACR）和驗收屏蔽寄存器（AMR）正確設(shè)置可以屏蔽與該節(jié)點不相干的ID號信息，可以提高有效信息的響應(yīng)速度。
3.2報文的循環(huán)發(fā)送與查詢發(fā)送
對于參與控制的重要信息幀一般應(yīng)采取定時循環(huán)發(fā)送方式，保證信息的實時刷新；而對于軟硬件版本查詢、參數(shù)標(biāo)定等需要臨時數(shù)據(jù)服務(wù)的則主要采用C/S（客戶機/服務(wù)器）方式進行信息幀發(fā)送，即進行特定的信息幀定義，當(dāng)服務(wù)器收到客戶機的參數(shù)查詢或標(biāo)定請求后再處理并發(fā)送相應(yīng)的回饋信息鄭
3.3“心跳”檢測
當(dāng)數(shù)據(jù)源節(jié)點退出總線后（故障或人為退出），接收節(jié)點相應(yīng)的接收數(shù)據(jù)緩沖區(qū)的數(shù)據(jù)必須進行復(fù)位，防止數(shù)據(jù)不*造成非期望事件發(fā)生。因此，一般要求源節(jié)點定時發(fā)送“心跳”信息，即設(shè)計一特定的信息幀或把特定信息幀中的某一位設(shè)計成代表該節(jié)點的“心跳”，節(jié)點啟動工作后每隔一定時間發(fā)送“心跳”信息幀或定義的“心跳位”高低電平變化一次，這樣如果在一定的時間內(nèi)沒有收到該節(jié)點“心跳”信息，則可以判斷節(jié)點不在總線上，進而做出相應(yīng)的事件處理。
圖2數(shù)據(jù)標(biāo)定流程圖
數(shù)據(jù)標(biāo)定流程圖
3.4傳輸錯誤檢驗
為了提高數(shù)據(jù)通訊的可靠性，對于關(guān)鍵數(shù)據(jù)幀（如標(biāo)定數(shù)據(jù)幀），采用和校驗的方式防止數(shù)據(jù)傳輸錯誤，即數(shù)據(jù)源節(jié)點將zui后一個數(shù)據(jù)字節(jié)定義為校驗字節(jié)，采用累加和等校驗等方式，將運算結(jié)果的低8位（即低位字節(jié)）作為校驗數(shù)據(jù)值。數(shù)據(jù)接收節(jié)點收到數(shù)據(jù)幀后，通過運算進行比較，結(jié)果無誤后再進行相應(yīng)的賦值處理。
3.5數(shù)據(jù)查詢與參數(shù)標(biāo)定
數(shù)據(jù)查詢和標(biāo)定采用重復(fù)發(fā)送控制信息直到得到特定反饋信息才結(jié)束的通信方式，流程如圖2所示。
4 CAN總線作業(yè)終端設(shè)計
將作業(yè)終端設(shè)計成一個智能節(jié)點，采用CAN總線通信，則可以減少連接線纜芯數(shù)的數(shù)量，提高工作可靠性；同時數(shù)據(jù)傳輸內(nèi)容豐富，可以傳遞狀態(tài)信息，也可以傳送報文信息，提高信息化程度；并可增加通信距離，提高工作的適應(yīng)性。
（1）硬件設(shè)計
基于帶CAN總線控制器的單片機 PIC18F458系統(tǒng)設(shè)計，通過CAN總線收發(fā)器 MCP2551與其它節(jié)點總線相連，外圍有開關(guān)量輸入電路、模擬量輸入電路、數(shù)碼管顯示電路、開關(guān)量輸出電路、CAN收發(fā)器和電源電路等，見圖3。
圖3 CAN總線作業(yè)終端硬件原理框圖
總線作業(yè)終端硬件原理框圖
5主控制器設(shè)計
主控制器為主要的操作信號采集的執(zhí)行單元，它將系統(tǒng)的操縱信號進行防誤操作處理后控制作業(yè)機構(gòu)的執(zhí)行元件。
主控制器采用EPEC系列高可靠性可編程控制器（PLC）設(shè)計，該系列控制器在國內(nèi)外工程機械中應(yīng)用較廣泛，具有兩個CAN通訊口，本身即可兼做多協(xié)議的網(wǎng)關(guān)。該型控制器具有以下優(yōu)點：抗電磁干擾、抗振動、耐油、適應(yīng)環(huán)境能力強、結(jié)構(gòu)緊湊、密封性好、具有自我保護能力的特點，可以*在野外惡劣環(huán)境條件下工作，可以直接驅(qū)動多種執(zhí)行器，如電液比例閥、伺服馬達等，特別適用于移動設(shè)備的使用。當(dāng)然，就CAN系統(tǒng)作業(yè)集成角度來看，STW，INTER CONTROL等控制器的性能也較好，各有其特色，可以根據(jù)控制需求進行選擇。
6虛擬儀表設(shè)計
虛擬儀表主要用于終端顯示，以提供各種作業(yè)信息。選用PC104主板作為嵌入式計算機系統(tǒng)的硬件，硬件配置表如表1所示，軟件采用實時性好的VxWorks操作系統(tǒng)，利用VxWorks BSP包完成移植。
表1虛擬儀表硬件配置表
虛擬儀表硬件配置表
虛擬儀表可以完成工作狀態(tài)顯示、傳感器數(shù)據(jù)標(biāo)定、視頻顯示等，提供了良好的人機交互界面，并可以通過RS232接口接入導(dǎo)航定位信息，提高裝備的信息化程度。
7 CAN總線調(diào)試診斷儀設(shè)計
調(diào)試診斷儀基于BIT技術(shù)，采用嵌入式系統(tǒng)架構(gòu)，硬件以ARM控制器為核心。ARM系列處理器采用32位嵌入式RISC結(jié)構(gòu)，內(nèi)部集成多級流水線以提高處理器指令的執(zhí)行速度，其強大功能與外圍電路的配合，將信號采集、處理、故障診斷及網(wǎng)絡(luò)通信等功能集于一體，特別適合作為智能儀器設(shè)備的開發(fā)平臺。 HMS30C7202是基于ARM720T的32位處理器，包括了PC機的所有基本功能。具有高性能低功耗的特點，片內(nèi)資源非常豐富，具有*的集成度，非常適用于嵌入式系統(tǒng)應(yīng)用。調(diào)試診斷設(shè)備硬件由基于ARM芯片 HMS30C7202的核心模塊加外圍電路組成，見圖4。為了充分發(fā)揮ARM芯片的效率，提高任務(wù)級的響應(yīng)時間，采用實時內(nèi)核C/OS-II來進行資源管理。C/OS-II是一個完整、可移植的搶占式實時多任務(wù)操作系統(tǒng)，具有執(zhí)行效率高、占用空間孝實時性能優(yōu)良和可擴展性強的特點。用戶界面基于MiniGUI平臺進行開發(fā)，*地提高了人機交互性能。
圖4調(diào)試診斷儀硬件架構(gòu)
調(diào)試診斷儀硬件架構(gòu)

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Mitsubishi Melsec PLC FX2N-80MR-ES/U?L
MITSUBISHI MELSEC PLC CONTROLLER FX2N-128MR-ES/?UL
Mitsubishi MELSEC FX3U-4AD-TC-AD?P Thermocouple Adapter
MITSUBISHI MELSEC FX2NC 16MT FX2NC16MT   NIB 
Mitsubishi Melsec AY11A Module NIB
Mitsubishi Melsec AX40Y10C Input/Output PLC Module
Mitsubishi Melsec AX10Y10C Input/Output PLC Module
MITSUBISHI MELSEC AOJ2-E24R AOJ2E24R NIB
Mitsubishi Melsec A1S62RD3N PT-100 Temperature Input Module A1S-62RD3N NIB
Mitsubishi MELSEC A1S62PA1S62PN?A1SCPU WITH I/O MODULE
Mitsubishi Melsec A1NCPU PLC Programmable Controller A1N-CPU
Mitsubishi Melsec A1NCPU PLC Programmable Controller A1N-CPU
Mitsubishi Melsec A1NCPU PLC Programmable Controller A1N-CPU
MITSUBISHI MELSEC A AJ51T64 I/O LINK REMOTE I/O SYSTEM MASTER MODULE NIB 
MITSUBISHI MC303B USPP MC303B
MITSUBISHI MC303 USPP MC303
MITSUBISHI MC301D USPP MC301D
MITSUBISHI MC301B USPP MC301B
MITSUBISHI MC301 USPP MC301
MITSUBISHI MC111 MC-111 SERVO CONTROLLER
MITSUBISHI M335MV-V USPP M335MVV
MITSUBISHI I/O MODULE AJ65SBTB1-32D AJ65SBTB132D
MITSUBISHI GH41 USPP GH41
MITSUBISHI FX-8ER-ES NSPP FX8ERES
MITSUBISHI FX-8ER-ES NSFP FX8ERES
MITSUBISHI FX-64MT USPP FX64MT
MITSUBISHI FX-64MT NSFP FX64MT
MITSUBISHI FX2N-48MT USPP FX2N48MT
Mitsubishi FX2-40AW Wire Link Module NIB
MITSUBISHI FX0S-14MR-DS NSPP FX0S14MRDS
MITSUBISHI FX0N-8ER-ES/UL USPP FX0N8ERESUL
MITSUBISHI FX0N-8ER-ES/UL NSFP FX0N8ERESUL
Mitsubishi FX0N-40ER-ES Extension Unit FXON-40ER-ES
MITSUBISHI F2-60ER USPP F260ER
Mitsubishi AY51 Output Module 32 Point Howa NIB FS
Mitsubishi AY50 16 Point Output Module NIB
MITSUBISHI AY13 OUTPUT MODULE 32POINT RELAY OUT 2AMP
Mitsubishi AX84 32 Point Input Module NIB
MITSUBISHI AX41 INPUT MODULE 32POINT DC SINK 12/24VDC 
MITSUBISHI AX40-Y50C USPP AX40Y50C
MITSUBISHI AOJ2-E56DT USPP AOJ2E56DT
MITSUBISHI AOJ2-E56DT NSFP AOJ2E56DT
MITSUBISHI AJ72-T25B USPP AJ72T25B
MITSUBISHI AJ72-R25 USPP AJ72R25
Mitsubishi AJ72-R25 AJ72R25 MELSEC PLC
MITSUBISHI AJ65SBTB2N-16A NSFP AJ65SBTB2N16A
MITSUBISHI AJ65SBTB2-16T USPP AJ65SBTB216T
MITSUBISHI AJ65SBTB1-32T USPP AJ65SBTB132T
MITSUBISHI AJ65SBTB1-32DT?1 USPP AJ65SBTB132DT1
MITSUBISHI AJ65SBTB1-32DT NSFP AJ65SBTB132DT
MITSUBISHI AJ65SBTB1-32D USPP AJ65SBTB132D
MITSUBISHI AJ65SBTB1-16T1 USPP AJ65SBTB116T1
MITSUBISHI AJ65-BTB2-16DR USPP AJ65BTB216DR
MITSUBISHI AJ51T64 USPP AJ51T64
MITSUBISHI AH42 NSFP AH42
MITSUBISHI AD32ID2 USPP AD32ID2
MITSUBISHI A68-ADC USPP A68ADC
MITSUBISHI A68-ADC NSPP A68ADC
MITSUBISHI A68-ADC NSFP A68ADC
Mitsubishi A62DA Digital-Analog Converter Module Howa 074-79-20663 FS
MITSUBISHI A4U-CPU USPP A4UCPU
MITSUBISHI A42XY USPP A42XY
MITSUBISHI A42XY NSFP A42XY
Mitsubishi A42XY  A42XYMitsubish?i 
MITSUBISHI A3N-CPU USPP A3NCPU
Mitsubishi A2USHCPU-S1 A1SJ71LP21 A1SJ71UC24-R4 PLC
MITSUBISHI A2UCPU-S1 NSPP A2UCPUS1
MITSUBISHI A2U-CPU USPP A2UCPU
MITSUBISHI A2S-HCPU-S1 USPP A2SHCPUS1
MITSUBISHI A2S-HCPU USPP A2SHCPU
MITSUBISHI A2S-CPU-S1 USPP A2SCPUS1
MITSUBISHI A2S-CPU USPP A2SCPU
MITSUBISHI A2S-CPU NSFP A2SCPU
MITSUBISHI A2N-CPU-S1 USPP A2NCPUS1
MITSUBISHI A2N-CPU-S1 USPP A2NCPUS1
Mitsubishi A2NCPUS1 Melsec CPU Module A2NCPU-S1
Mitsubishi A2ASCPU Melsec Module Ship To 12 month 
MITSUBISHI A2ACPU-S1 USPP A2ACPUS1
MITSUBISHI A2ACPU-S1 NSFP A2ACPUS1
MITSUBISHI A2A-CPU-R21 USPP A2ACPUR21
MITSUBISHI A2A-CPU USPP A2ACPU
MITSUBISHI A2A-CPU NSPP A2ACPU
MITSUBISHI A1S-JCPU USPP A1SJCPU
MITSUBISHI A1SJ72QBR15 MELSECNET/10 REMOTE I/O MODULE 
MITSUBISHI A1S-HCPU USPP A1SHCPU
MITSUBISHI A1S-HCPU NSFP A1SHCPU
MITSUBISHI A1SH42-S1 NSPP A1SH42S1
MITSUBISHI A1S-H42 USPP A1SH42
MITSUBISHI A1S-H42 NSFP A1SH42
MITSUBISHI A1S-CPU-S1 USPP A1SCPUS1
MITSUBISHI A1S-CPU USPP A1SCPU
MITSUBISHI A1S-68AD A1S68AD X 4 Four units
MITSUBISHI A1S-62RD3N USPP A1S62RD3N
MITSUBISHI A1S62DA OUTPUT MODULE ANALOG 2POINT
Mitsubishi A1S61PN A2ASCPU A1SX40 A1SY40 A1SG60 A1S38B A1SJ71UC24-R2
MITSUBISHI A1S SYSTEM w. A1SCPU A1SD61 A1SY80 A1SX40 
MITSUBISHI A1N-CPU USPP A1NCPU
MITSUBISHI A1-CPU USPP A1CPU
MITSUBISHI A1-CPU NSFP A1CPU
Mitsubishi A0J2-E56DR PLC I/O Expansion Module FS AOJ2
Mitsubishi A0J2-E28DT PLC I/O Expansion Module FS
MITSUBISHI .A278LX MOTION CONTROLLER.XLT?.
Mint Juniper Netscreen NS-ISG-2000 Advanced w/ OS 6.3r10 Latest
Mint Juniper Netscreen NS-ISG-2000 Advanced OS 6.3r10 Latest
Minn Kota SW RT 80/EM Engine Mount Trolling Motor
Minn Kota Saltwater Engine Mounted Rt80em 24v 80lb 1370625
MINN KOTA SALTWATER ENGINE MOUNTED RT80EM 24V 80LB 1370625
MINN KOTA SALTWATER ENGINE MOUNTED RT80EM 24V 80LB 1370625
Minn Kota Saltwater Engine Mounted Rt55em 12v 55lb 1370615
MINN KOTA SALTWATER ENGINE MOUNTED RT55EM 12V 55LB 1370615
MINN KOTA SALTWATER ENGINE MOUNTED RT55EM 12V 55LB 1370615
MINN KOTA SALTWATER ENGINE MOUNTED RT160EM 24V 160LB
Minn Kota RT80EM Engine Mount Saltwater Trolling Motor 24v-80lb
Minn Kota RT80/EM Engine Mount Saltwater TROLLING MOTOR 80 Pound 24v 1370625
Minn Kota RT80/EM Engine Mount Saltwater Trolling Motor 24V-80lb 1370625
Minn Kota RT80/EM Engine Mount
Minn Kota RT55EM ENGINE MOUNT Saltwater TROLLING MOTOR
Minn Kota RT55/EM Engine Mount Saltwater Trolling Motor 12V-55lb 1370615
Minn Kota RT55/EM Engine Mount Saltwater Trolling Motor 12V-55lb 1370615
Minn Kota RT160/EM Engine Mount
Minn Kota MK80EM Freshwater Engine Mount Trolling Motor 24v-80lb
Minn Kota MK80EM Freshwater Engine Mount Trolling Motor
MINN KOTA MK55EM ENGINE MOUNTED 55LB THRUST 12V 1370610
MINN KOTA MK55EM ENGINE MOUNTED 55LB THRUST 12V 1370610
Minn Kota MK55/EM Engine Mount Freshwater Trolling Motor 12V-55lb 1370610
Minn Kota MK55/EM Engine Mount
Minn Kota MK101EM Freshwater Engine Mount Trolling Mtr
Minn Kota MK101EM Freshwater Engine Mount Trolling Motor 36v-101lb
Minn Kota MK101EM Freshwater Engine Mnt Trolling Motor WORLDWIDE SHIP 1370630
Minn Kota Mk101em Engine Mounted 101lb Thrust 36v 1370630
Minn Kota MK101/EM Engine Mount
Minn Kota FW MK80/EM Engine Mount Trolling Motor
Ming
MINCO CT15021 TEMPERATURE CONTROLLER 100-240VAC SSRALA
MILLER FLUID POWER APL4093101 USPP APL4093101
Millennia Media AD-596
Millennia AD-596 Analog-Digital Converter
MID S5 Google Android 2.2 7’ Touchscreen Tablet PC
MICROSTAR MSXB-017-03 I/0 BOARD MSXB01703 NIB 
Microsoft BASIC Professional Development System
Microseven EXView CCD18X High Speed Dome Wireless H.264 PTZ IP Camera Mac Ready
Microseven EXView CCD18X High Speed Dome Wireless H.264 PTZ IP Camera Mac Ready
Microseven EXView CCD 26X High Speed Dome Wireless H.264 PTZ IP Camera Mac Ready
MicroNet RAIDBank5 RB5-15000 DAS Hard Drive Array 5 x HDD Installed 15 TB In
Microfast Controls SMF-M1480-010 SMFM1480010 I/O Module Rack 
Microelettrica Scientifica mc30 Three-Phase Overcurrent and Earth Fault Relay 
Microbot TeachMover Robot Kits  Parts and Boards 
Micro Industries MVME605 I/O Module  No Box
Metasonix KV-100 AssBlaster Multi-Effects-?
MEMUSB-1024FT 1GB USB FLASH TOKEN
MEMOTEC 30033001-007 USPP 30033001007
MEM-NPE-G2-2GB for Cisco NPE-G2 Fast Ship w/wrnty
MEM-NPE-400-25?6MB 256MB MEMORY FOR CISCO NPE-400 7200 SERIES
MEM-CF-512MB 512MB FLASH MEMORY FOR CISCO 1900 2900 3900 ISR
MEM-CF-256MB 256MB COMPACT FLASH FOR CISCO 1900 2900 3900 ISR
MEM-CF-256MB 256MB COMPACT FLASH FOR CISCO 1900 2900 3900 ISR
MEM-CF-1GB 1GB COMPACT FLASH FOR CISCO 1900 2900 3900 ISR
MEM3800-512D 512MB DRAM MEMORY FOR CISCO 3825/3845
MEM3800-256D 256MB DRAM MEMORY FOR CISCO 3825/3845
MEM3800-128CF 128MB FLASH MEMORY FOR THE CISCO 3825/3845
MEM2800-64U256?CF 64 TO 256 MB CF UPGRADE FOR CISCO 2800 SERIES
MEM2600XM-32FS 32MB FLASH SIMM FOR CISCO 2600XM SERIES
MEM2600XM-16FS 16MB FLASH SIMM FOR CISCO 2600XM
MEM2600-32D 32 MB DRAM FOR CISCO 2600 SERIES
MEM-256M-AS54 256MB MAIN SDRAM FOR CISCO AS5400
MEM1700-64D 64MB DRAM DIMM FOR CISCO 1700 SERIES
MELSEC Mitsubishi A68AD Analogue Input Module 8 Channel Excellent Cond
Mellanox InfiniHost III Lx Infiniband MHGS18-XTC
MEDAR I/O MODULE 5305-B
MEASUREX 51304483-100 USPP 51304483100
Measurex 05331100 VFC 40 500k Honeywell 
Measurex 05331100 VFC 40 500k Honeywell 
Measurex 05331100 VFC 40 500k Honeywell 
Measurex 05329500  05329600 diagnostic break point 
Measurex 05319100 high density contact output buffer
Measurex 05312900 floppy interface Honeywell
Measurex 05312600 Send Receive Buffer SRB Honeywell
Measurex 05291202 Contact I/O Honeywell
Measurex 05291200 Contact I/O Honeywell
Measurex 05291000 Honeywell replaced  05367601
ME-3400G-2CS-A CISCO Multi-layer Ethernet Access Switch
ME-3400G-2CS-A CISCO Multi-layer Ethernet Access Switch
McIntosh MHT-100 A/V System Controller 
MC7090 Wireless Enterprise Digital Assistant MC7090-PK0DJRF?A7WR MC7090-PK0DJRF
MC7090 Wireless Enterprise Digital Assistant MC7090-PK0DJRF?A7WR 
MBD-X7DVL-L-O Motherboard Standard Retail Pack 
MAXXESS BLP 201 READER BOARD  QUAD OUTPUT MODULE WITH ENCLOSURE
MAXXESS BARLOCK 200 READER BOARD  QUAD OUTPUT MODULE WITH MOUNTING BRACKET
Marposs E4N LVDT Amplifier Module 2 Input E4NLVDT 
MARINE GPS NAVIGATION SYSTEM CAV-2000
MARINE GPS NAVIGATION SYSTEM CAV-1000
MARINE ELECTRO PROCESS MCB-16DIO/10.P?1 USPP MCB16DIO10P1
Marconi FORE Net Mod PN: NM-/622SMLRE 1YR 
Marconi FORE Net Mod PN: NM-/622SMIRLC 1YR 
MAN ROLAND 16.86926-0008 NSPP 16869260008
MAN ROLAND 16.86926-0008 NSFP 16869260008
Make offers ships to We buy OFF LEASE EQUIPMENT
Lynx TWO-C Soundcard  Free International 
Lynx Two-C 6 In 2 Out 192KHz AD/DA PCI Sound Card
Lynx Two-B 2 In 6 Out 192KHz AD/DA PCI Sound Card
Lynx Two-A 4 Analog I/O 192KHz AD/DA PCI Sound Card
Lynx Two-A 4 Analog I/O 192KHz AD/DA PCI Audio Interface
Lynx LynxTWO-C 192 kHz Multichannel Audio Reference
Lynx LynxTWO-B 192 kHz Multichannel Audio Reference
Lynx LynxTWO-A Multi-Channel Reference PCI Card 
Lynx LynxTWO-A 192 kHz Multichannel Audio Reference
Lynx LS-AES 8-Channel Expansion Soundcard Brand 
Lynx Aurora 8 D/A  A/D ConverterHD Card2 Lynx CablesWarra?nty
Lynx Aurora 16-VT HD with installed LT-HD interface
Lynx Aurora 16 D/A  A/D ConverterUSB Card4 Lynx CablesWarra?nty
Lynx Aurora 16 D/A  A/D ConverterHD Card4 Lynx CablesWarra?nty
LYNGSO MARINE IOM402 USPP IOM402
LUMBERG 0970-PSL-115 NSFP 0970PSL115
Lucent ica 89-0360-A DS-1 I/O Front module BA9IAA0AA
Lucent PSAX NS20N360KD 1250/2300 6-PORT ENHANCED
Lucent Excel VSE-BSU CPU I/O 16-span ESX-T1C T-One MIO 
LSI/3Ware 9750-4I 4-Port 6G/s PCI Express SAS RETAILBOX
LSI LSI00211 9280-24i4e SGL SAS 24 Int. 4 Ext. RAID 
LSI LSI00211 9280-24i4e SGL SAS 24 Int. 4 Ext. RAID 
LSI LSI00211 9280-24i4e SGL SAS 24 Int. 4 Ext. RAID 
LSI LSI00211 9280-24i4e SGL SAS 24 Int. 4 Ext. RAID 
LSI LSI00210 9280-16i4e SGL SAS 16 Int. 4 Ext. RAID
LSI LSI00210 9280-16i4e SGL SAS 16 Int. 4 Ext. RAID
LSI LSI00210 9280-16i4e SGL SAS 16 Int. 4 Ext. RAID
LSI LSI00210 9280-16i4e SGL SAS 16 Int. 4 Ext. RAID
LSI LSI00208 9260-16i SGL SAS 16 Internal Ports RAID
LSI LSI00208 9260-16i SGL SAS 16 Internal Ports RAID
LSI LSI00208 9260-16i SGL SAS 16 Internal Ports RAID
LSI LSI00208 9260-16i SGL SAS 16 Internal Ports RAID
LSI Logic SAS/SATA ESM RoHS I/O Module M101651 Engenio 24199-00 24198-00 
LSI Logic LSI00306 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card 
LSI Logic LSI00306 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00306 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00306 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00305 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card 
LSI Logic LSI00305 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00305 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00305 MegaRAID 9266-4i 4Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00296 MegaRAID 9266-8i 8Port Internal 1GB SATA/SAS Controller Card 
LSI Logic LSI00296 MegaRAID 9266-8i 8Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00296 MegaRAID 9266-8i 8Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00296 MegaRAID 9266-8i 8Port Internal 1GB SATA/SAS Controller Card
LSI Logic LSI00282 MegaRAID 8-port 9260CV-8i SAS RAID Controller
LSI Logic LSI00282 MegaRAID 8-port 9260CV-8i SAS RAID Controller
LSI Logic LSI00282 MegaRAID 8-port 9260CV-8i SAS RAID Controller
LSI Logic LSI00282 MegaRAID 8-port 9260CV-8i SAS RAID Controller
LSI Logic LSI00280 MegaRAID 4-port 9260CV-4i SAS RAID Controller
LSI Logic LSI00280 MegaRAID 4-port 9260CV-4i SAS RAID Controller
LSI LOGIC LSI00187 Megaraid SAS 8708EM2 8PORT 256MB 3GB S SATA controller card
LSI LOGIC LSI00187 Megaraid SAS 8708EM2 8PORT 256MB 3GB S SATA controller card
LSI LOGIC LSI00187 Megaraid SAS 8708EM2 8PORT 256MB 3GB S SATA controller card
LSI LOGIC LSI00187 Megaraid SAS 8708EM2 8PORT 256MB 3GB S SATA controller card
LSI 3ware SAS 9750-24i4e PCIe 2.0 8X 6Gbps per channel
LSI 3ware SAS 9750-24i4e PCIe 2.0 8X 6Gbps per channel
LS INDUSTRIAL SYSTEMS G4Q-TR4A USPP G4QTR4A
Loughborough Sound Images LSI DBV44 VME MVME
78 OPTO 22 IAC5 I/O MODULE IAC5 OPTO 22 IAC5
5 HP Compaq 6000 Pro SFF Desktop PC/Dual Core 2.8GHz/8G DDR3/Windows7 Pro
5 HP Compaq 6000 Pro SFF Desktop PC/Core 2 Duo E7200 2.53GHz/8G/Win?dows 7
5 Allen Bradley 1746-OW16 /C 1746-0W16 Relay Output 
3 allen bradley 1785-ka3 1785-enet 1771-asb c
2 HP Compaq 6000 Pro SFF Desktop PC/Dual Core 2.8GHz/8G DDR3/Windows7 Pro
2 HP Compaq 6000 Pro SFF Desktop PC/Core 2 Duo E7200 2.53GHz/8G/Win?dows 7
2 ALLEN BRADLEY 1794-IB16 /A FLEXLOGIC INPUT MODULE
10 Allen Bradley 1734-OB4E /C 1734-0B4E 24VDC Output Modules
 for Cisco WS-SUP720-3B 720 Supervisor Engine Grade A 
 Allen Bradley SLC 500 Analog Combination I/O 1746-NIO4V Ser A 
 10x ASUS P4SDX SIS655 P4 Motherboard 478 DDR333
Longline GLC-LH-SM for CISCO GE SFPLC CONNECTOR LX/LH TRANSCEIVER
Logic Control LM3016E 
LNC 2009 Mfg date 1794-IF4I Allen Bradley Flex I/O Analog Input 1794IF4I N250
LNC 2009 mfg date 1794-IF4I Allen Bradley Flex I/O 1794IF4I N814
LNC 11/2011 mfg 1746-NI8 frn 2 Allen Bradley SLC 500 Analog 1746NI8 N912
Like No Box.
Lifetime Manufacturer  ships same 
Lian-Li PC-X2000FB Black Aluminium Full Tower Chassis
Lian-Li PC-X2000FB Black Aluminium Full Tower Chassis
Lian-Li PC-X2000FB Black Aluminium Full Tower Chassis
Lian-Li PC-X2000FB Black Aluminium Full Tower Chassis
LG INDUSTRIAL SYSTEMS GDL-TR4C1 NSFP GDLTR4C1
LG INDUSTRIAL SYSTEMS GDL-TR2C1 NSFP GDLTR2C1
LG INDUSTRIAL SYSTEMS GDL-D24C NSFP GDLD24C
LEXICON digital effects processor MX-300 BRAND 
Lenovo ThinkStation S20 Workstation XEON W3503 2.4GHz
Lenovo ThinkStation E31 2555 Xeon E3-1225V2 3.2 GHz Brand 
Lenovo ThinkStation D20 4105 Workstation PC In Xeon 3.06GHz 4GB 500GB HDD 
Lenovo ThinkStation D20 4105 Workstation PC In Xeon 3.06GHz 4GB 500GB HDD 
Lenovo ThinkStation 782457U WorkstationXe?on 3.3GHz4G500G?BQuadro 2000W7Pro
Lenovo ThinkStation 782457F WorkstationXe?on 3.3GHz4G500G?BQuadro 2000W7Pro
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black 
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black 
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkStation 4105O3U W3550 3.06GHz 4GB 500GB Windows 7 Raven Black
Lenovo ThinkPad X230 Laptop i5-3320M 4GB RAM 500G HDD W7P DVDRW 232036U
Lenovo ThinkPad X230 Laptop i5-3320M 4GB RAM 500G HDD W7P 12.5" W7P 232036F
Lenovo ThinkPad X230 Laptop i5-3320M 4GB RAM 500G HDD W7P 12.5" 343522U
Lenovo ThinkPad X230 Laptop i5-3210M 4GB RAM 500G HDD W7P DVDRW 12.5" 232032U
Lenovo ThinkPad X230 34352TU 12.5" LED Tablet PC Core i7 i7-3520M 2.9GHz Bla
Lenovo ThinkPad X230 343522U 12.5" LED Tablet PC Core i5 i5-3320M 2.6GHz Bla
Lenovo ThinkPad X220T i5-2520M 4GB 320G W7P 12.5"
Lenovo ThinkPad X220 Tablet 4296 Core i7 2.8GHz 128GB SSD 42963UU 12in
Lenovo ThinkPad X220 Laptop In i5-2450M 4GB RAM 320G W7P 12.5" W7P 42875TU
Lenovo ThinkPad X220 Laptop i7-2640M 4GB RAM 128G SSD 12.5" W7P 428767U
Lenovo ThinkPad X220 Laptop i7-2640M 4GB 128G SSD 12.5" W7P 428757U
Lenovo ThinkPad X220 Laptop i5-2520M 4GB 320G 42872WU
Lenovo ThinkPad X220 Laptop i5-2450M 4GB RAM 320G HDD W7P 12.5" 42875TF
Lenovo ThinkPad X220 Core i7-2640M/4GB/1?28GB SSD/12.5"/Webc?am/Win7 428757U
Lenovo ThinkPad X220 Core i7-2640M/4GB/1?28GB SSD/12.5"/Webc?am/Win7 428757U
Lenovo ThinkPad X220 42962WU 12.5" LED Tablet PC Core i5 i5-2520M 2.5GHz BLK
Lenovo ThinkPad X220 42962WU 12.5" LED Tablet PC Core i5 i5-2520M 2.5GHz Bla
Lenovo ThinkPad X220 4290 429034U 2.5GHz Core i5 2520M 320GB Laptop
Lenovo ThinkPad X220 428767U 12.5" LED Notebook Core i7 i7-2640M 2.80GHz Bla
Lenovo ThinkPad X220 428743U 12.5" LED Notebook Core i5 i5-2430M 2.4GHz Blac
Lenovo ThinkPad X220 428742U 12.5" LED Notebook Finger Print Reader Bluetooth
Lenovo ThinkPad X220 42872WU 12.5" LED Notebook 320GB HDD Bluetooth Webcam 9.2Hr
Lenovo ThinkPad X220 4287 In Core i7 2640M 2.8GHz 128GB SSD Laptop
Lenovo ThinkPad X201 3113ED9 12.1" LED Tablet PC 
Lenovo ThinkPad W520 Laptop i7-2860QM 8GB RAM 500G HDD W7P DVDRW 15.6" 42763LU
Lenovo ThinkPad W520 Laptop i7-2760QM 8GB RAM 500GB HD W7P 15.6" DVDRW 42763JU
Lenovo ThinkPad W520 Laptop i7-2760QM 8GB RAM 500G HDD 15.6" DVDRW 42763JF
Lenovo ThinkPad W520 42763LU 15.6" LED Notebook Core i7 i7-2860QM 2.50GHz PN 
Lenovo ThinkPad W520 42763LU 15.6" LED i7-2860QM 2.50GHz 8GB 500GB Windows 7
Lenovo ThinkPad W520 42763LU 15.6" LED i7-2860QM 2.50GHz 8GB 500GB Windows 7
Lenovo ThinkPad W520 42763LU 15.6" LED i7-2860QM 2.50GHz 8GB 500GB Windows 7
Lenovo ThinkPad W520 42763LU 15.6" LED i7-2860QM 2.50GHz 8GB 500GB Windows 7
Lenovo ThinkPad W520 42763JU 15.6" LED Notebook Core i7 i7-2760QM 2.4GHz PN 4
Lenovo ThinkPad W520 42763JU 15.6" LED Notebook 500GB HDD 8GB RAM 10.8Hr Bat 
Lenovo ThinkPad W520 42763JF 15.6" LED Notebook 500GB HDD 8GB RAM 10.8Hr Bat 
Lenovo ThinkPad W500 WORKSTATION  ISV CERTIFICATIONS 
Lenovo ThinkPad T530 Laptop i7-3520M 4GB RAM 500G HDD W7P 15.6" NVS 5400M DVDRW
Lenovo ThinkPad T530 Laptop i5-3320M 4GB RAM 500G HDD W7P DVDRW 239242U
Lenovo ThinkPad T530 Laptop i5-3320M 4GB RAM 500G HDD W7P DVDRW 15.6" 239245U NV
Lenovo ThinkPad T530 239245U 15.6" LED Notebook Core i5 i5-3320M 2.6GHz Blac
Lenovo ThinkPad T530 239242U 15.6" LED Notebook Core i5 i5-3320M 2.6GHz Blac
Lenovo ThinkPad T530 239242U 15.6" i5-3320M 2.6GHz 4GB 500GB Windows 7 
Lenovo ThinkPad T530 239242U 15.6" i5-3320M 2.6GHz 4GB 500GB Windows 7
Lenovo ThinkPad T530 239242U 15.6" i5-3320M 2.6GHz 4GB 500GB Windows 7
Lenovo ThinkPad T520 Laptop i5-2540M 4GB RAM 128G SSD W7P 15.6" DVDRW 424053U
Lenovo ThinkPad T520 Laptop i5-2450M 4GB RAM 320G HDD 15.6" DVDRW W7P 42395CU
Lenovo ThinkPad T520 Laptop i5-2450M 4GB 320G W7P DVDRW W7P 15.6" 42395CF
Lenovo ThinkPad T520 42406MU 15.6" LED Notebook 500GB HDD 4GB RAM 14Hr Bat 
Lenovo ThinkPad T520 42404AF 15.6" LED Notebook Core i5 Bluetooth DisplayPort
Lenovo ThinkPad T520 42404AF 15.6" LED Notebook Core i5 Bluetooth DisplayPort
Lenovo ThinkPad T520 42395CF 15.6" LED Notebook 320GB HDD Bluetooth Webcam 7.7Hr
Lenovo ThinkPad T520 423946U 15.6" LED Notebook Core i5 i5-2520M 2.5GHz Blac
Lenovo ThinkPad T520 423946U 15.6" LED Notebook 320GB HDD Bluetooth Webcam 7.7Hr
Lenovo ThinkPad T520 423946U 15.6" i5-2520M 4GB 320GB
Lenovo ThinkPad T520 423946U 15.6" i5-2520M 4GB 320GB
Lenovo ThinkPad T520 423946U 15.6" i5-2520M 4GB 320GB
Lenovo ThinkPad T520 423946U 15.6" i5-2520M 4GB 320GB
Lenovo ThinkPad T520 423946F 15.6" LED Notebook 4GB RAM 7.7Hr Bat Bluetooth 
Lenovo ThinkPad T430S Laptop i5-3210M 4GB RAM 500G HDD W7P DVDRW 14" NV 23535UU
Lenovo ThinkPad T430S Laptop i5-3210M 4GB RAM 500G HDD W7P DVDRW 14" NV 23535UU
Lenovo ThinkPad T430S Laptop i5-3210M 4GB RAM 500G HDD W7P DVDRW 14" NV 23535UF
Lenovo ThinkPad T430S Laptop i5-3210M 4GB RAM 500G HDD W7P DVDRW 14" NV 23535UF
Lenovo ThinkPad T430s 23535UU 14" LED Notebook Core i5 i5-3210M 2.5GHz Black
Lenovo ThinkPad T430 Laptop i7-3520M 4GB RAM 500G HDD DVDRW W7P 14" 23445PU
Lenovo ThinkPad T430 Laptop i5-3320M 4GB RAM 500G HDD W7P 14" DVDRW 23445GU
Lenovo ThinkPad T430 Laptop i5-3320M 4GB RAM 500G HDD W7P 14" DVDRW 23442HF
Lenovo ThinkPad T430 23445GU 14" LED Notebook Core i5 i5-3320M 2.6GHz Black 
Lenovo ThinkPad T430 2344-2HU 14" LED Notebook Core i5 i5-3320M 2.6GHz Black
Lenovo ThinkPad T420S Laptop i5-2540M 128GB SSD 417153F
Lenovo ThinkPad T420s 417152F 14" LED Notebook 320GB HDD Webcam Bluetooth 5.5Hr 
Lenovo ThinkPad T420s 4171 Core i7 2.8GHz 41717FU 14in W7pro 160GB SSD
Lenovo ThinkPad T420 Laptop i5-2520M 4GB RAM 320G HD W7P DVDRW 14" 4177Q5F
Lenovo ThinkPad T420 Laptop i5-2520M 4GB 320G W7P DVDRW 14" 4177Q5U
Lenovo ThinkPad T420 Laptop i5-2450M 4GB RAM 320G HD DVDRW W7P 14" 4177RVU
Lenovo ThinkPad T420 4236X08 14" LED Notebook Core i3 i3-2350M 2.3GHz Black 
Lenovo ThinkPad T420 4236X08 14" i3-2350M 2.3GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4236X08 14" i3-2350M 2.3GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4236X08 14" i3-2350M 2.3GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4178C9F 14" LED Notebook 500GB HDD Bluetooth Webcam 9Hr Bat
Lenovo ThinkPad T420 41786UU 14" LED Notebook Core i5 i5-2520M 2.50GHz Black
Lenovo ThinkPad T420 41786UU 14" LED Notebook Core i5 i5-2520M 2.50GHz Black
Lenovo ThinkPad T420 41786UF 14" LED Notebook 500GB HDD 9HR Bat Webcam Bluetooth
Lenovo ThinkPad T420 4178 In Core i5 2520M 2.5GHz 160GB SSD Laptop
Lenovo ThinkPad T420 4177X07 14" LED Notebook Core i3 i3-2310M 2.1GHz Black 
Lenovo ThinkPad T420 4177X07 14" i3-2310M 2.1GHz 4GB 320GB Windows 7
Lenovo ThinkPad T420 4177X07 14" i3-2310M 2.1GHz 4GB 320GB Windows 7
Lenovo ThinkPad T420 4177X05 14" LED Notebook Core i3 i3-2310M 2.1GHz Black 
Lenovo ThinkPad T420 4177X01 14" LED Notebook Core i3 i3-2310M 2.10GHz Black
Lenovo ThinkPad T420 4177X01 14" i3-2310M 2.10GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4177X01 14" i3-2310M 2.10GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4177X01 14" i3-2310M 2.10GHz 4GB 320GB Windows 7 Black
Lenovo ThinkPad T420 4177RVU 14" LED Notebook i5-2450M 2.50GHz Bluetooth Webcam
Lenovo ThinkPad T420 4177RVF 14" LED Notebook 320GB HDD Webcam 9HR Bat Bluetooth
Lenovo ThinkPad T420 4177RVF 14" LED Notebook 320GB HDD Webcam 9HR Bat Bluetooth
Lenovo ThinkPad T420 4177Q5U 14" LED Notebook Black Core i5 Webcam DisplayPort
Lenovo ThinkPad T420 4177Q5U 14" LED Notebook 320GB HDD 9HR Bat DisplayPort 
Lenovo ThinkPad T420 4177 In Core i5 2430M 2.4GHz 4GB 320GB 14in
Lenovo ThinkPad T410 2522KJU 14.1" LED Notebook Core i5 i5-540M 2.53GHz Blac
Lenovo ThinkPad L520 Laptop i5-2520M 4GB 320G 786035U
Lenovo ThinkPad L520 Laptop i5-2520M 4GB 320G 786035F
Lenovo ThinkPad L412 058542U 14" LED Notebook Core i5 i5-520M 2.4GHz Black 
Lenovo ThinkCentre M91P 7052 Desktop In i7 Quad Core 3.4GHz 4GB DDR3 1TB 
Lenovo ThinkCentre M81 7518D4U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7 Black
Lenovo ThinkCentre M81 7518D4U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7 Black
Lenovo ThinkCentre M81 7518D4U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7 Black
Lenovo ThinkCentre M81 7518D4U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7 Black
Lenovo ThinkCentre M81 7517B1U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7
Lenovo ThinkCentre M81 7517B1U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7
Lenovo ThinkCentre M81 7517B1U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7
Lenovo ThinkCentre M81 7517B1U Desktop i3-2130 3.4GHz 4GB 320GB Windows 7
Lenovo M91p 7052C9U Desktop PCi7-26004GB?1TBHD2000W7?Pro
Lenovo M91p 7052C9F Bilingual Desktop PCi7-26004GB?1TBHD2000W7?Pro
Lenovo M91p 7052C2U Desktop PCi5-24004GB?250GBHD2000?W7Pro
Lenovo M91p 7052B9U Desktop PCi7-26004GB?500GBHD6450?W7Pro
Lenovo M91p 7052B9U Desktop PCi7-26004GB?500GBHD6450?W7Pro
Lenovo M91p 7052B2U Desktop PCi7-26004GB?500GBW7Pro
Lenovo M91p 7052B2F Bilingual Desktop PCi7-26004GB?500GBW7Pro
Lenovo M91p 4480C2F Bilingual Desktop PCi7-26004GB?1TBW7Pro
Lenovo M91p 4480B9U Desktop PCi5-24004GB?250GB W7Pro
Lenovo M91p 4480B3U Desktop w/i7-2600 4GB 500GB W7Pro
Lenovo M91p 4480B3FBiling?ual Desktop w/i7-2600 4GB 500GB W7Pro
Lenovo M81 7518E1U Desktop PCi5-24004GB?500GBW7Pro
Lenovo M81 7518D7U Desktop PCi3-21204GB?250GBW7Pro
Lenovo M81 7518D4U Desktop PCi3-21304GB?320GBW7Pro
Lenovo M81 7518D4F Bilingual Desktop PCi3-21304GB?320GBW7Pro
Lenovo M81 7517C1U Desktop PCi5-24004GB?500GBHD2000?W7Pro
Lenovo M81 7517C1F Bilingual Desktop PCi5-24004GB?500GBHD2000?W7Pro
Lenovo M81 7517B1U Desktop PCi3-21304GB?320GBHD2000?W7Pro
Lenovo M81 7517B1F Bilingual Desktop PCi3-21304GB?320GBHD2000?W7Pro
Lenovo 833214U 6 TB 2U Rack-mountable Secure Managed Client Network Storage
LEEDS  NORTHRUP 074429 NSPP 074429
Lavry 4496-12 2 Channel ADC  2 Channel DAC Converter
LATEST Revision R3.0 SuperMicro PDSME Bulk Pack MB FULL MFR 
LATEST Rev R2.01a?SuperMicro H8DME-2 Bulk Pack MB FULL MFR 
LATEST Rev R2.01 SuperMicro H8DAR-T Bulk Pack MB FULL MFR 
LATEST Rev R1.1 SuperMicro X6DHR-IG2 Bulk Pack MB FULL MFR 
LATEST Rev R1.02 SuperMicro H8QMI-2 Bulk Pack MB FULL MFR 
LATEST Rev R1.01 SuperMicro X7DWU Motherboard FULL MFR 
LASER PARALLEL/USB HP P3005X WITH NETWORK DUPLEXER AND ADDITIONAL 500 Q7816A 
Landis A121836 I/O Module Base A120276  No Box
LANDIS  GYR 549-210 NSFP 549210
LANDIS  GYR 549-209 USPP 549209
L5201-2-02 SSD Analog I/O Module Diff Link L5201202 In Excellent Condition
Krauss Maffei TE500 Control Board TE-500 5089390 
Krauss Maffei SR501 Control Board SR-501 5089435 
Krauss Maffei DT100 AE1 LS Control Board DT-100 
KRAUSS MAFFEI CORP. 5088020 IO 502 CARD
Krauss Maffei 5080188 CPU Board MC2/MC3 
Koyo Direct Logic PLC Rack w/ CPU  Touchscreen 3498
Koyo Direct Logic 6 D0-06DD1 I/O Module DC Micro PLC 
KOYO Automation Direct Logic DL205 with D2-240 F2-04AD-2 D2-16ND3-2 and D2-08TRS
Koyo Automation Direct Logic 205 D2-250 F2-02DA-2 D2-16NA D2-12TA D2-06B TESTED
Korg M3 73 73-key Workstation/Sa?mpler Keyboard
Korg M3 61 61-key Workstation/Sa?mpler Keyboard
Korg Electribe ESX1SD with Built-in SD Card  
KONTRON CTM80-2 REAR I/O T6701AC FOR DT64/CP6010/CP?6000
KONGSBERG RAI-16 USPP RAI16
KONGSBERG RAI-16 USPP RAI16
KONGSBERG NN-791/HER-100?261H USPP NN791HER100261?H
KONGSBERG 6200263 USPP 6200263
Knight Rider 7 Inch Android 2.3 Car DVD with 3G Internet.
Kloehn Syringe V6 VersaPump Pump 26044
KLOEHN CO. LTD V8 Multi-Channel Syringe Pump 250ml standard syringe
KLOCKNER MOELLER EM4-101-AA2 USPP EM4101AA2
KLOCKNER MOELLER EM4-101-AA1 USPP EM4101AA1
Kingston/StorC?ase Data Silo DS500 9-Bay/Hard Drive Ultra-SCSI RAID Storage Tower
Kikusui KSG4310 FM/AM Stereo Signal Generator
Keyence PLC Controller KV-16R and 2 I/O Modules KV-8ER Nice Shape
KEYENCE CORP KL32CT USPP KL32CT
KET KAT-SP COUNTER CONTROL ASSEMBLY W PUSH TO LIGHTSW
KEP SCPTHMS16P3C5D?1A 6 DIGIT LED COUNTER W PRESET 110VA
Kensington 4000A 5-Axis Controller Compley Optioned
Keithley MSSR-32 BD PC6432 Rev A Circuit Board Module
Just add your E7-4800 processor IN Like condition
Juniper SSG-5-SH Juniper Secure Services Gateways 
Juniper SSG-550-001 Secure Services Gateway 550
Juniper SSG-20-SH-W Juniper Secure Services Gateway 20 1 Year Wtny
Juniper SRX5K-4XGE-XFP 4x10 Gigabit XFP Ethernet I/O  COUIAUFBAD
Juniper SRX5800 Firewall SRX5800BASE-DC 150Gbps Security Gateway Free Ship
Juniper SRP-5G 5-Gbps switch fab Mod ERX-5ECC-SRP ERX 
Juniper OC3-4SM_I/O 4Port SM IOA for OC3/OC12-ATM ERX-OCXA256M-M?OD OC3/OC12-POS
Juniper OC12-SM_I/O ERX 1-Port OC12STM4 SM I/O 90 Hardware  Free Ship
Juniper NS-ISG-TX2 2prt 10/100/1000TX Ethernet ISG-2000 90  Hardware 
Juniper NS-ISG-SX2 ISG I/O Module two Port Mini GBIC-SX Free Overnight Ship
Juniper NS-ISG-SX2 ISG I/O Module two Port Mini GBIC-SX 
Juniper NS-ISG-LX4 4-Port I/O Module ISG-2000 ISG-1000 90   Free Ship
Juniper NS-ISG-FE8 8 Port 100bT for ISG-1000 ISG-2000 90  Hardware 
Juniper NS-ISG-2000 NS-ISG-SX2 NS-ISG-FE8 90   
Juniper NS-ISG-2000 Firewall NS-ISG-TX4 NS-ISG-1XG AC 90   Free Ship
Juniper NS-ISG-1XG ISG1000 and ISG2000 I/O Module 1-port 10GB 1 YEAR 
Juniper NS-500-SK1 FirewallVPN Netscreen 500 Adv  90  
Juniper NS-500-HG1-SX NS-500 Single Port SX Module 90   Free Ship
Juniper Networks SRX-SFP-1GE-LX SFP Wired Transceiver Module for SRX 5000
Juniper Netscreen NS-ISG-1XG 10G for ISG-1000 ISG-2000 90   Free Ship
Juniper Netscreen NS-500-HG2-SX 2 port GBIC module
Juniper Netscreen ISG 2000 2-Port I/O Module GB2-TX NS-ISG-TX2
Juniper ISG-2000 Advanced Model NS-ISG-2000-DC 5.4.0r10.0 90  Warr Free Ship
Juniper FE-8_I/O 8 Port 10/100TX Rear Interface 90   
Juniper ES2-SRP-IOA E120 E320 BSR Switch Route Processor Input Output Adapter
Juniper ES2-GE8S1-IOA E320 half-height 8-port GE IOA 
Juniper ES2-10GES2-IOA 2 10-Gig Ethernet ports 1-active 1 standby E320 E120
Juniper ERX-GEFE256M-M?OD 1-port GE or 8-port 10/100 FE 90  Hardware  
Juniper ERX-8GEHDE-IOA Works with ERX-HDE-MOD line module 8 Port GE IOA
Juniper ERX-700 705 710 Edge Router SRP-5 90   
Juniper ERX-310 Router EX3-310DC1G-SY?S ERX-GEFE256M-M?OD 90  Free Ship