HART通信模型 由3层组成：物理层、数据链路层和应用层。物理层采用FSK(FrequencyShiftKeying)技术在4～20mA模拟信号上迭加一个频率信 号，频率信号采用Bell202国际标准;数据传输速率为1200bps，逻辑0的信号频率为2200Hz，逻辑1的信号传输频率为1200Hz。数据链 路层用于按HART通信协议规则建立HART信息格式。其信息构成包括开头码、显示终端与现场设备地址、字节数、现场设备状态与通信状态、数据、奇偶校验 等。其数据字节结构为1个起始位，8个数据位，1个奇偶校验位，1个终止位。应用层的作用在于使HART指令付诸实现，即把通信状态转换成相应的信息。它规定了一系列命令;按命令方式工作。它有3类命令，第一类称为通用命令，这是所有设备理解、执行的命令;第二类称为一般行为命令，它所提供的功能可以在许 多现场设备(尽管不是全部)中实现，这类命令包括常用的现场设备的功能库;第三类称为特殊设备命令，以便在某些设备中实现特殊功能，这类命既可以在基金会中使用，又可以为开发此命令的公司所。在一个现场设备中通常可发现同时存在这3类命令。
FAFNIR 1 15/16 PILLOWBLOCK BEARING SURPLUS
IDC SELECT UCP209-28 PILLOWBLOCK BEARING 1 3/4 BORE HIGH-CENTER & SET SCREWS
CUTLER HAMMER D725SVP232HDWNT INDUSTRIALCOMPUTER
OMRON C200H-TC 001TEMPERATURE CONTROLUNIT
OMRON C500-ID215 INPUT UNIT XLNT CONDITION
OMRON S82J-15024E1 POWER SUPPLY
OMRON F300-D I/O UNIT
OMRON F300-A20 CAMERA I/F UNIT
OMRON C200H-OC225 OUTPUT MODULE
OMRON 3G2A5-BC081 CPU BASE UNIT
OMRON C500-AD002 A/DUNIT
OMRON 3G2A5-LK005 LINK UNIT * XLNT CONDITION *
OMRON SCY-P0R10E SYSMAC I/O MODULE (AC 100/110/120/200/220/240)
OMRON PHOTOELECTRICSWITCH TYPE- MSD-SB( IN BOX)
OMRON CV500-BSC31 BASIC UNIT
OMRON CV500-RT211 REMOTE I/O UNIT
OMRON C200H-OA122-EOUTPUT UNIT
OMRON F200-P POWER SUPPLY UNIT GOOD WORKING TAKEOUT
OMRON F300-FM MMI UNIT WITH CONSOLE F300-KP NICE TAKEOUT
OMRON C500-RM001-PEV1 REMOTE I/O UNIT
OMRON 3G2C3-CPU11E C500 CONTROLLER W/ RAM / ROM UNIT
OMRON F200-C10E IMAGE PROCESSING UNIT
OMRON CV500-RM211 REMOTE I/O UNIT
ly listedFISHER 3622 VALVE POSITIONER SURPLUS NO BOX
MARTIN ENGINEERING VIBRATOR CC 36-3000GOOD TAKEOUT
NTN 7408 BG ANGULAR CONTACT BALL BEARING SURPLUS
FEDERAL SIGNAL ELECTRERAY 225X CLEAR SIGNAL LIGHT SURPLUS
ABB 10D1475 SN04PL29KY12A1112C1 MAGNETIC FLOWMETER INBOX
FEDERAL SIGNAL 121S120RSB VITALITE (RED) 120 VAC IN BOX
ly listedFISHER 3622 VALVE POSITIONER PULLED FROMWORKING VALVE
PSI-TRONIC PG3000 RANGE 40 BAR G
FOXBORO ECKARDT SRI986-B1DS7FAANA POSITIONER (!)
DWYER MAGNEHELIC A-27 DIFFERENTIAL PRESSURE GAGE
DAYTON 3BB91 SUBMERSIBLE PUMP 2/HP 240/VOLT 1 PHASE 60/HZSIZE 2 IN
PSI-TRONIX PG3000 XIHFGCX-2L-N4 RANGE10-BAR-G
ly listedFISHER TYPE S100-4REGULATOR (2 PCS.)1 LOT
FAFNIR SAS 1 11/16'' PILLOW BLOCK BEARING SURPLUS
FEDERAL SIGNAL ELECTRERAY 225X AMBER SIGNAL LIGHT SURPLUS
ENDRESS+HAUSER FTL3660AE2A14G LIQUIPHANTII BRAND NO BOX
FISHER TYPE 95H REGULATOR RANGE 25-75 MAX PRESS. 300 SET PRESS. 150 SURPLUS
MRC TRW 210S19 ABEC7 BALL AND ROLLER BEARING OLD STOCK
ly listedFISHER 1077 VALVE OPERATOR
UNITED ELECTRIC I120-S126B PRESSURE SWITCH OP-RANGE 30 TO 3HGVAC -1 TO -0.1 BAR
CONSOLIDATED 1313-KBALL BEARING SURPLUS BEARING BRAND BOX WORN
ENDRESS+HAUSER FTL51-QAE2CB4E5A LIQUIPHANT M FLOW METER
MYRON ZUCKER KIM43006-3 CAPACITOR CALMOUNT SERIES, 6 KVAR ( IN BOX)
APOLLO 2" CF8M STAINLESS STEEL THREADEDBALL VALVE 76-108-27 SURPLUS
HONEYWELL C437D.E.G.H GAS PRESSURE SWITCH BRAND
GREER 847840 HYDRAULICS GREEROLATOR BLADDER VALVE SIZE 15 CU. IN PSI 2000
ULTRASONIC GENERATORSHANGHAI ACCOUSTICSLAB SURPLUS NOBOX
MAYATECH CORPORATION 464290 BRAND NOT IN BOX
ASHCROFT TYPE 2200/2100 INDICATING&NON INDICATING TEMP REGULATOR SIZE 1 1/2 IN.
PINNACLE MICROGUARDDR-40-0F-AU-MO GOODTAKEOUT
FEDERAL SIGNAL 151XST RED STROBE WARNINGLIGHT VOLT 120/ 0.32 AMPS SURPLUS
ROSEMOUNT APEX RADARLEVEL GAUGE APEXBC1A15C4N04A101C1M1E5 IN BOX
DELCO N D H 1#Q30307 ANGULAR BALL BEARINGS (2 PCS 1 LOT )
SKF 1313-KJ TAPER BORE BEARING BOX WORNBEARING BRAND
VALVCON LVW30001KS2N115AC VALVE ACTULATOR 115/V-60 HZ TORQUE 3000LB/IN
ASHCROFT DURAGAUGE45-1279-88-04L-16BRSIZE 4 1/2 IN. RANGE16BR IN BOX
RBC B24L SPHERICAL PLAIN BEARING 1-1/2"ID X 2-7/16" OD SURPLUS
TRI-CLOVER A13MHM-4-S 211057 4" 1 BOXOF 5 CLAMPS STAINLESS STEEL NIB
NIDEC HP-L01-2Z9 HANDY-PULSER PENDANT PL2-300-34
FLOWSERVE SEAL 561389 SIZE 2.165 316S/S REPAIRED IN BOX
DAYTON 3BB91 SUBMERSIBLE PUMP 2/HP 240/VOLT 1 PHASE 60/HZSIZE 2 IN
BARMAG HYDRAULIC PUMP 1-016-0616 W/ DANFOSS MOTOR & GEARBOX
EATON 70523-LBX HYDRAULIC PISTON PUMP BRAND
FISHER BIG JOE 630-376 REGULATOR RANGE 46-95 PORT 1/2 MAX PSI 250V
FANUC A02B-0236-C126/MBR MDI UNIT PANELA02B0236C126/MBR TAKEOUT
BLACKMER GX2B VANEPUMP SER.# 4ERC01320000NR DATE 06/11 PUMP
REXNORD 20 SHSB STDSTRAIGHT BORE HUB SIZE 1 7/8 SURPLUS
REXNORD 20 SHSB STDSTRAIGHT BORE HUB SIZE 2 3/8 SURPLUS
EUROTHERM 103/LGC/J/0-400C/115V/S TEMPERATURE CONTROL ( IN BOX)
KRAUSS MAFFEI 6269384 HYDRAULIC PUMP BRAND
PYRONICS12BZR DIAPHRAM REGULATOR VALVE SIZE 1 1/2 IN
ZENITH 11-57252-8100-0 PLANETARY GEAR PUMP
TRI-CLOVER A13MHM-4-S 211057 4" 1 BOXOF 5 CLAMPS STAINLESS STEEL NIB
TEXTRON CINOX CX 56HYDRAULIC PUMP NOTHING HAS BEEN HOOKED TO SHAFT
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