AR2 18 IN
日期：2020-9-10
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最广、最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是串行通讯方式最为丰富的小型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，接收方必须对指令作进一步的确认工作，以防止错误的指令被执行，最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。 咨询热线：18150695049
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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
*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*