YXT 115B 4890024-NK输入输出模块_漳州鼎晟达自动化设备有限公司

YXT 115B 4890024-NK输入输出模块

1 引言

PLC因为稳定可靠、结构紧凑、简单易学、功能强大和使用方便已经成为应用面广、广泛的通用工业控制装置，成为现代工业自动化控制的主要支柱之一。而单片机因为成本低廉，使用灵活，功能多样，在自动化领域应用及其广泛，往往在一个控制系统中可能会出现单片机和PLC共存的情况，如果使二者互相联系，互相通信，具有非常重要的现实意义。

2 硬件以及通讯原理分析

西门子S7-200系列PLC拥有RS-485串行口，所以要使MCS51单片机与S7-PLC进行通讯，可以采用几种通讯方式。其中之一就是可以通过MCS-51的串行口与MAX485芯片相接，然后与S7-200 PLC的RS-485口进行通讯，其硬件连接如图1所示。

S7-200 PLC是串行通讯方式为丰富的小型PLC，支持多种通信协议，如点对点接口协议（PPI协议）、多点接口协议（MPI协议）和PROFIBUS协议以及自由通信协议等。其中自由通信协议又叫用户定义协议，利用自由端口模式，可以实现用户定义的通信协议，连接多种智能设备，使用起来非常方便，在第三方工程接入中取得了巨大的成功。

在自由端口模式下，PLC的串行通信接口由用户来控制，通过梯形图程序以及和单片机的汇编语言进行配合，来使用完成中断、字符接收中断、发送完成中断等，通信协议由用户完全控制。这时单片机处于主机状态，由单片机主动发送握手信号，PLC接到信号后被动反馈信息即可。

3 通信系统设计

3.1 通信协议设计

定义根据经验和有关参考资料，定义协议结构和参数。

（1）通信波特率为9.6kbps，无校验，8个数据位，1个可编程位，1位起始位，1位停止位。

（2）定义通信协议的数据流结构的格式为起始码、命令码、元件首址、字节数、数据块、BCC校验码和结束码。

● 起始码：表示单片机与PLC开始发送数据，是数据流第一个字符，告诉PLC开始进行通信了，可以用00H表示

● 命令码：表示单片机对PLC的各种操作：

40H：读取目标元件 I、Q、V、M、SM、L、T、C等的数据或状态；

41H：修改目标元件 I、Q、V、M、SM、L、T、C等的数据或状态；

42H：强制目标单元为ON；

43H：强制目标单元为OFF；

● 元件首址：表示PLC内部的元件类型以及寄存器的地址（但不能表示一个位地址）。前两个字节表示寄存器类型，后两个字节表示寄存器号。00 00（H）：I寄存器区 01 00（H）：Q寄存器区。02 00（H）：M寄存器区 08 00（H）：V寄存器区；

● 字节数：从元件首地址起，读取或写入PLC元件的数据个数数据块：准备读取或者写入PLC的数据或状态；

● BCC校验码：在传输过程中，指令有可能受到任何的干扰而使原来的数据信号发生扭曲，此时的指令当然是错误的，为了侦测指令在传输过程中发生的错误，接收方对指令作进一步的确认工作，以防止错误的指令被执行，简单的方法就是使用校验码。BCC校验码的方法就是将要传送的字符串的ASCII码以字节为单位作异或和，并将此异或和作为指令的一部分传送出去；同样地，接收方在接到指令后，以相同的方式对接收到的字符串作异或和，并与传送方所送过来的值作对比，若其值相等，则代表接收到的指令是正确的，反之则是错误的

● 结束码：结束字符标志着指令的结束，在本例中被定义为FFH，不同的PLC从站可以定义不同的结束字符以接收针对该PLC的指令。

3.2 通信程序的实现

（1）单片机端程序的实现。单片机在主程序中初始化，采用串行口工作方式3[2]，波特率为9.6kbps，采用单片机作为主机，向PLC进行呼叫，定期读取数据或者写入数据，其程序流程图参见图2。

（2）PLC端程序流程图的实现。PLC端作为从机，采用梯形图或者STL编程，主要是先设置通讯协议，然后按照协议把采集到的数据进行处理，再发送给主机单片机，其具体的程序流程图如图3所示。

4 结束语

本文利用单片机与PLC的串行通信方法，成功的应用于多个项目中，实际表明该方法简单可靠，成本低，而且易于扩充经济实用的其它功能，如A/D、D/A等功能，取得了较好的社会效益和经济效益。

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Cisco TelePresence MCU MSE 8510 CTI-8710-TS-K9 ServerTANDBERG Video Conferencing

New Cisco Dell IronPort SMA-M670-K9 M670 Security Management Appliance

Cisco ASA5520-AIP40-K9 IPS Edition 1YearWarranty 2+Available

Cisco ME-3800X-24FS-M Carrier Switch Router ME-FANTRAY PWR-ME3KX-DC Ethernet MH

Cisco GSR10/200-AC 12410 12000-SIP-601 4GE-SFP-LC SPA-1XTENGE-XFP CSC SFC Router

~NEW SEALED~ CISCO WS-C3850-48U-E Stackable Ethernet Switch ~FAST DELIVERY~

*Brand NEW* CISCO WS-C3850-48U-E Stackable 48 10/100/1000 ports + C3850-NM-4-1G

BRAND NEW IN BOX Cisco WS-C4500X-32SFP+ Catalyst 4500X Switch ! SHIP FAST !

CISCO U7225VXR-M16EUG1 | incl 19% VAT | 2 years Cybertrading warranty

New Cisco Systems ASR-9010-AC-V2 | incl 19% VAT | 2 years Cybertrading warranty

*NEW SEALED* WS-C3850-16XS-E CISCO 12(1/10G)SFP+ W/C3850-NM-4-10G IP SVCS

NEW IN BOX CISCO WS-C3850-24XS-S CISCO 24PT SFP+, 715WAC, IP BASE ! SHIP FAST !

NEW Sealed Cisco N3K-C3548P-10G N3K-C3548P-10G Nexus 3548 Switch, 48 SFP+ Switch

New CISCO ASR1002 with 4-built-in GE Dual AC FLASR1-IPSEC-RTU ASR1002-5G-VPN/K9

*Good Condition* Cisco N7K-F248XP-25E Nexus Series Switch * Fast Ship *

New ASR1002-5G-VPN/K9 CISCO ASR1002 with 4-built-in GE Dual AC FLASR1-IPSEC-RTU

CISCO - ASR1001-X= - Cisco ASR1001-X Chassis, 6 built-in GE, Dual P/S, 8GB DRAM

Cisco Systems WS-C6513-E | incl 19% VAT | 2 years Cybertrading warranty

Cisco Systems ASA5525-IPS-K8

*NEW sealed* Cisco 76-ES+T-4TG ES+ Low Queue 4 port 10GE - 3CXL for Cisco 7603

Cisco CSACS-1120-K9

*** we buy Cisco WS-C3750X-48PF-E **** (Brand New) 3750X (MO)

Cisco UBR-E-16U BR7225VXR E-16U BPE, 1 downstream with upconverter, 6 upstreams,

NEW CISCO C3945-VSEC/K9 3-Port Gigabit Wired Router

Cisco CRS-4-CH 4-Slot Chassis CRS1-SIP-800 CRS-8-RP 4-10GE CRS-MSC CRS-4-FC LCC

Cisco WS-C4503-E w/ WS-X45-SUP7L-E, WS-X4612-SFP-E - Complete System

Cisco UCSB-B200-M3 128GB, 2x Intel E5-2667 v2, 2x 500GB 6Gb SATA

Cisco ASR1001X-5G-K9 6 BUILT IN GE 2 AC Power 8GB DRAM-NED-

New CISCO ASR1002-5G-VPN/K9 ASR1002 w/ 4-built-in GE Dual AC FLASR1-IPSEC-RTU

New Sealed Cisco ISR4451-X-SEC/K9 Cisco ISR 4451 Security Bundle w/SEC license

CISCO ME-3800X-24FS-M ME 3800X-24FS Ethernet Carrier Ethernet Switch Router

CISCO WS-C6509-E w/ Fan, 3000W Power, 1x WS-X6716-10GE-3C, 1x VS-S720-10G-3CXL

!! BRAND NEW IN BOX !! Cisco WS-C4900M Cisco Catalyst 4900M Switch ! SHIP FAST !

Cisco DS-X97-SF1-K9 MDS 9700 Series Supervisor-1 Module w/ *Enterprise Software*

NEW IN BOX CISCO NEXUS N5K-C5596UP-FA SWITCH CHASSIS *SHIP FAST*

Cisco Catalyst 3750X-48T-S - Switch - verwaltet

Cisco CUVC-5230-HD30 Cisco Unified Videoconferencing CUVC-5-PS Dual AC

*New* Cisco ASR1001 4 built-in GE Dual AC Power 4GB DRAM ASR1001-2.5G-VPNK9

**NEW Sealed* Cisco WS-C4500X-32SFP+ Catalyst 4500-X 32 Port 10GE IP Base Switch

NEW Sealed Cisco N5K-C5596UP-FA Nexus Chassis includes 48 fixed unified ports

we buy Cisco *** asr-1001 *** Router: Cisco ASR1001 (MO)

**New** N5K-C5596UP-FA CISCO NEXUS 5596UP 48PT CHASSIS *with 1 year warranty*

****** NEW CISCO C3945-CME-SRST/K9 - Factory Sealed in Box 3945 NIB ******QTY

NEW Sealed Cisco N5K-C5548UP-FA Nexus Chassis includes 32 fixed unified ports

BRAND NEW IN BOX ! N5K-C5596UP-FA Cisco Nexus 5596UP Switch Chassis !SHIP FAST !

Cisco Systems AIR-CT5760-50-K9

Cisco SPA-1XCHOC48/DS3 Cisco 1-port Channelized OC48/STM-16 SPA

Cisco WS-C4506-E SUP7-E, 2x X4648-RJ45V-E, 2x X4648-RJ45V+E, 2x 1000AC

NEW Sealed Cisco ASR1001-X CISCO 6 GE PORT Router with Dual Power Supply ASR1001

*New* Cisco AIR-CT5508-25-K9 5500 Series Wireless Controller for up to 25 Access

Cisco ESR-4OC3-CHSTM1 Line Card 1YearWarranty 2+Available

NEW ASR1001-2.5G-VPNK9 Cisco ASR1001 4 built-in GE Dual AC Power 4GB DRAM

#NEW# Cisco N5K-C5596UP-FA Nexus 5596UP Switch Chassis #FAST SHIPMENT#

NEW Cisco WS-C3750X-48T-S Catalyst 3750X-48T-S Layer 3 Switch 3750X 48 Port Data

NEW Sealed Cisco WS-C3850-16XS-S 16 SFP+ Gigabit Ethernet (GE) Ports Switch

New Cisco Systems WS-C4948E-E | incl 19% VAT | 2 years Cybertrading warranty

Cisco Systems MCS-7835H3-DMS

Cisco Systems MCS-7835H3-OFFER

New CISCO AS535XM-2T1-48-V | incl 19% VAT | 2 years Cybertrading warranty

New Cisco Systems WS-X4724-SFP-E incl 19% VAT // 2 years IT4Trade warranty

*NEW* ASR1001-2.5G-VPNK9 Dual AC Power 4GB DRAM Cisco ASR1001 4 built-in GE

*New Sealed* Cisco WS-C3850-16XS-S Catalyst 3850 12 SFP+ port stackable model

CATALYST 3560X 48 PORT Cisco WS-C3560X-48P-S

Cisco Systems CTS-C40-K9

NEW Sealed Cisco N3K-C3172PQ-10GE Nexus 3172PQ, 48 SFP+ and 6 QSFP+ ports

Cisco WS-C4506-E X45-SUP7L-E, 2x X4648-RJ45V-E, 2x -X4648-RJ45-E, 2x 1000AC

cisco N5K-C5596UP-FA factory sealed

CISCO 7604 w/ 1x RSP720-3C-GE, 7600-ES20-10G3C, 7600-ES20-GE3C - 3YR Warranty

New Cisco N3K-C3172-FA-L3 Nexus N3K-C3172PQ-10GE 2x N2200-PAC-AC N3K-LAN1K9 KAJ

CISCO 15454-DS3XM-12

Cisco AS535XM-8T1-V-HC Router 1YearWarranty 2+Available

NEW IN BOX CISCO C6800-8P10G Catalyst Gigabit Ethernet Fiber Module *SHIP FAST*

NEW Cisco AIR-CT5508-50-K9 5500 Series Wireless Controller for up to 50 access

Cisco Systems AS54-CT3-540NP

Cisco Systems N5K-C5596UP-FA | incl 19% VAT | 2 years Cybertrading warranty

Cisco Systems WS-X6848-TX-2TXL

Cisco Systems CTS-1300-65 | incl 19% VAT | 2 years Cybertrading warranty

Cisco Systems ASR1000-ESP10

Cisco Systems 12000-SIP-501 | incl 19% VAT | 2 years Cybertrading warranty

*New Sealed* Cisco WS-X6904-40G-2T Catalyst 6900 Series 4-Port 40 Gigabit Module

New Cisco Systems ASA5540-K8 | incl 19% VAT | 2 years Cybertrading warranty

New CISCO WS-SVC-WISM-1-K9 | incl 19% VAT | 2 years Cybertrading warranty

NEW IN BOX CISCO ASR1002-X CHASSIS 6 PORT GE ROUTER, DUAL AC P/S **SHIP FAST**

Cisco DS-C9250I-K9 MDS 9250i 50 port switch base config w/ 3 x DS-C50I-300AC

Cisco WS-C4503E-S7L+48V+ Catalyst 4503-E 1YearWarranty 2+Available

CISCO A9K-2T20GE-B 2PORT 10GE, 20PORT GE LINE CARD, 3 YR WARRANTY

Cisco New N5K-C5596UP-FA 48 Fixed Unified Ports Nexus Switch N55-PAC-1100W

CISCO Optical Amplifier Module 15454-OPT-AMP-C= 3YR WNTY

NEW SEALED Cisco ASR1002-X ASR 1002-X Router 6 built-in GE ports Dual Power ASR

BRAND NEW IN BOX ! CISCO ASR1002-X ASR Series Router ! SHIP FAST !

NEW IN BOX Cisco WS-C3650-48FQ-E 48POE+ GE, 4x10G, 1025W, IP Service Switch

NEW Sealed Cisco ASR1002-X ASR 1002-X Router 6 built-in ports 2x ASR1002-PWR-AC

Cisco UCSB-B200-M3 256GB, 2x Intel 2.60GHz E5-2650v2/95W, 2x 500GB 6Gb SATA 7.2K

Cisco Systems CTS-C40-K9 | incl 19% VAT | 2 years Cybertrading warranty

*NEW SEALED* Cisco ASR1002-X ASR 1002-X Router 6 built-in GE Dual ASR1002-PWR-AC

! BRAND NEW IN BOX !Cisco WS-C4948E Catalyst 4948 48 Port Switch ! SHIP FAST !

Cisco Catalyst 3850-48F-S - Switch - L3

WS-C6506-E 8700W P/S 2x VS-S720-10G-3C 2x WS-X6708-10G-3CXL 2x WS-X6748-SFP

New Cisco Systems A9K-AIP-LIC-B | incl 19% VAT | 2 years Cybertrading warranty

Cisco WS-C4506-E - X45-SUP7L-E, 5x X4648-RJ45-E, 2x 1000AC

NEW IN BOX CISCO NEXUS N3K-C3548P-10GX 3548-X 48 SFP+ Ports Enhanced Switch

New Sealed Cisco WS-C4500X-F-32SFP+ Catalyst 4500X-F-32 SFP+ Switch

*Brand NEW* CISCO WS-C3850-48T-E 48 ports Switch + C3850-NM-4-1G Module

New Cisco Systems WS-X4712-SFP+E | incl 19% VAT | 2 years Cybertrading warranty

Cisco Systems ASA5525-IPS-K9 incl 19% VAT // 2 years IT4Trade warranty

Cisco Systems WS-X6904-40G-2T

New Cisco Systems WS-C3560X-48P-E incl 19% VAT // 2 years IT4Trade warranty

New Cisco Systems N7K-M108X2-12L | incl 19% VAT | 2 years Cybertrading warranty

New Cisco Systems SPA-10X1GE-V2 | incl 19% VAT | 2 years Cybertrading warranty

Cisco C3945E-VSEC/K9 Gigabit Services Router C3900-SPE250/K9 PVDM3-64 3945E-SEC

Cisco SPA-8XT3/E3 Clear Channel ASR1000 73-14495 IPUIAS5 800-38309 SIP10 SIP40 J

Cisco 7600-ES+2TG3CXL Line Card 7600 ES+ Line Card, 2x10GE XFP with DFC 3CXL

CATALYST 3750X 48 PORT Cisco WS-C3750X-48T-L

New Cisco Systems WS-C3850-12XS-E | incl 19% VAT | 2 years Cybertrading warranty

New Cisco Systems C3925-AX/K9 | incl 19% VAT | 2 years Cybertrading warranty

*NEW* WS-X6816-10G-2T 16 Port 10G with DFC4 module

Cisco UCSC-C240-M4S w/ dual P/S 2x 1TB 6Gb SATA, E5-2609, 10x 4GB DDR3

Cisco ASR1004 4-Slot Chassis w/ AC PWR, ASR1000-ESP20, ASR1000-RP1 Bundle

Cisco WS-C6504-E Dual P/S 2x VS-S720-10G-3C WS-X6708-10G-3CXL WS-X6748-SFP

NEW IN BOX Cisco Nexus N3K-C3548P-10GX 3548-X 48 SFP+ Ports Enhanced Switch

*New* Cisco ASR1001-X ESP5 6 built-in GE Dual AC Power 8GB DRAM ASR1001X-5G-K9

Cisco Systems 15216-MD-ID-50

Cisco SPA-8XT3/E3 Cisco 8-Port Clear Channel T3/E3 Shared Port Adapter

NEW WS-C4500X-F-16SFP+ 4500-X 16 Port Switch w/ Dual C4KX-PWR-750AC-F Power

NEW ASR1001X-5G-K9 Cisco ASR1001-X ESP5 6 built-in GE Dual AC Power 8GB DRAM

New Cisco Systems N7K-MPLS1K9 | incl 19% VAT | 2 years Cybertrading warranty [N7

Cisco Systems N3K-C3548P-10G

New CISCO AS535XM-2T1-48-D | incl 19% VAT | 2 years Cybertrading warranty

*NEW* L-ASA-SSL-750= Cisco ASA 5500 Series SSL VPN License

CISCO 7606-S w/ 2x RSP720-3C-GE, 2x PWR-2700-AC CISCO7606-S - 3YR Warranty

Cisco WS-C6509-E w/ VS-S2T-10G SUP2T-10G, dual AC Power 6500 Bundle - Warranty

*NEW SEALED* CISCO WS-C4500X-F-32SFP+ with 2 Years Warranty 4500X

*NEW SEALED FAST SHIP* CISCO N5K-C5596UP-FA (2YrsWarranty) N5K 5596

*NEW SEALED FAST SHIP* CISCO WS-C3850-12X48U-E (2 Years Wnty) 3850

Cisco N9K-C9396PX Nexus Switch contains N9K-PAC-650W-B & N9K-C9300-FAN2-B NOB

NEW Sealed Cisco WS-C4500X-F-32SFP+ Catalyst 4500-X 32 Port 10GE IP Base Switch

*NEW* ASR1001X-5G-K9 Cisco ASR1001-X Dual AC Power 8GB DRAM ESP5 6 built-in GE

*New Sealed* Cisco WS-C3850-12X48U-S Catalyst C3850 Switch C3850-NM-2-10G Module

Brand NEW Cisco C1-C4500X-32SFP+ Catalyst 4500-X IP Base Switch w/ Power Supply

New Sealed Cisco N3K-C3548P-10GX= Nexus 3548-X 48 SFP+ ports, Enhanced Fast Ship

Cisco Systems WS-C3850-12XS-E

NEW Sealed Cisco N3K-C3548P-10GX Nexus 3548x Switch, 48 SFP+

Cisco UCSB-B200-M3 256GB, 2x Intel 2.60GHz E5-2630v2/80W, 300GB 6Gb SAS 15K RPM

#NEW# Cisco N3K-C3548P-10GX 48 Port Enhanced Switch #FAST SHIPMENT#

New CISCO ASA-CSC20-1KUP-2Y | incl 19% VAT | 2 years Cybertrading warranty

New Cisco Systems WS-X6708-10G-3C incl 19% VAT // 2 years IT4Trade warranty

New Cisco Systems N2K-C2224TF-1GE incl 19% VAT // 2 years IT4Trade warranty

New Cisco Systems WS-C3850-48U-L incl 19% VAT // 2 years IT4Trade warranty

Cisco Systems WS-X4712-SFP+E incl 19% VAT // 2 years IT4Trade warranty

New Cisco Systems WS-C3750X-24S-E incl 19% VAT // 2 years IT4Trade warranty

*NEW SEALED* CISCO WS-C3850-24XS-S 2 Years Warranty/VATfree 6500€ 3850

Cisco Systems WS-C3850-24UW-S incl 19% VAT // 2 years IT4Trade warranty

New Cisco Systems ASA5545-IPS-SSP | incl 19% VAT | 2 years Cybertrading warranty

NEW IN BOX CISCO WS-C3850-12X48U-E Catalyst 3850 48 Port IP Service *SHIP FAST*

*New* Cisco ISR4451-X/K9 4451-X Integrated Services Router

CISCO ASR1002 ASR1002-X 6GE 3 SPA 5G ESP 4GB IP BASE SLASR1-IPB 2 AC ROUTER NEW

NEW SEALED Cisco WS-C3750G-16TD-S Switch 1YearWarranty 2+Available

* New In Box * CISCO WS-C4500X-32SFP+ Catalyst Switch * Fast Shipment *

Cisco UCSC-C240-M3S dual P/S 24x 600GB 6Gb SAS,2x Xeon E5-2630v2, 176GB (8GB)

CISCO 7600-ES+2TG3CXL 7600 ES+ Line Card, 2x10GE XFP with DFC 3CXL

Cisco UCSC-C240-M3S dual P/S 10x 300GB 6Gb SAS, 2x Xeon E5-2630Lv2, 192 (16GB)

Cisco Systems A9K-MPA-4X10GE

CISCO 7600-ES+2TG3CXL | incl 19% VAT | 2 years Cybertrading warranty

Cisco Systems A9K-40GE-B

#NEW# Cisco WS-C4500X-24X-IPB 24 Port 10GE IP Base Switch #FAST SHIPMENT#

~NEW SEALED~ CISCO WS-C4500X-24X-IPB 24 Port Catalyst Switch ~FAST DELIVERY~

New CISCO C3925-VSEC-SRE/K9 | incl 19% VAT | 2 years Cybertrading warranty

Cisco Systems VS-C6503E-SUP2T

CISCO A9K-MPA-2X40GE ASR 9000 2 Port 40GE Module Port Line card

Cisco WS-X6148-FE-SFP (Refurbished) Catalyst 6500 48 port 100Base-X module

NEW SEALED CISCO VS-S2T-10G - Sup2T, 2x10GbE, 3x1GbE w/ MSFC5 PFC4 - 3YR Warr

*New* Cisco WS-C3650-48FD-E 48 10/100/1000 C3650 Series Ethernet PoE+ Switch

Cisco CRS-8-LCC 40GB Fabric CRS-1 CRS-8/S CRS-8-DC-PEM CRS-8-RP Route Processor

CISCO 7600-ES+20G3CXL - 7600 ES+ Line Card, 20xGE SFP DFC3CXL - 3YR Warranty

CISCO 7600-ES+2TG3CXL - 7600 ES+ Line Card, 2x10GE XFP with DFC 3CXL - 3YR Warr

CISCO 7604 w/ 1x RSP720-3C-10GE, 2x PWR-2700-AC/4 CISCO7604 - 3YR Warranty

CISCO 7604 w/ 1x RSP720-3C-10GE, 2x PWR-2700-DC/4 CISCO7604 - 3YR Warranty

CISCO 7606 w/ 1x RSP720-3C-10GE, 2x PWR-2700-AC CISCO7606 - 3YR Warranty

CISCO 7606 w/ 1x RSP720-3C-10GE, 2x PWR-2700-DC CISCO7606 - 3YR Warranty

CISCO RSP720-3CXL-10GE - 7600 RSP 720Gbps fabric, PFC3CXL, 10G - 3YR Warranty

CISCO UBR10012 w/ 2x ESR-PRE2, MC20X20V-20D, ESR-HH-1GE, 2xAC CMTS - 3YR Warr

Cisco XR 12000 Series Router 12404 w/ 2x PRP-2 4GB, 2x 12000-SIP-601 & SPAs

Cisco WS-C6506-E w/ VS-S2T-10G SUP2T-10G Dual AC Power Bundle 6500 - Warranty

Cisco UCSC-C240-M3S dual P/S 2x Xeon E5-2697 v2, 160GB (8GB) 1600-MHz

Cisco ASA5540-AIP40-K8 5500 Adaptive Security Appliance 1YearWaranty 2XAvailable

Cisco AS54-4E1-120-AC-V Universal Gateway 1YearWarranty 2+Available

Cisco ASA5580-20-4GE-K9 Appliance 1YearWaranty 2+Available

New Sealed Cisco ASA5525VPN-EM750K9 Security Appliance 1Year Waranty 2+Available

Cisco Telepresence CTI-7010-TPSRV-K9 Voice/video/data server 1YearWrn 2+Avalable

New Cisco Telepresence CTS-CAM-P60 Videoconferencing camera 1YearWrnty 2+Avlable

*New In Box* 2x Cisco WS-C2960XR-48FPD-I Switch *Fast Shipment*