1756-IR6I

1756-IR6I

1756-IR6I

5、其它介质和其它总线的理论极限
        以上的RS-485距离极限343512米以及31228米（9600bps）与传输介质无关，就是说用光纤传输RS-485最远也是这么多，无线也是一样。
       以上的无误码RS-485距离极限31228米（9600bps）与协议无关，就是说用CAN、PROFIBIUS最远也是这么多，原理是一样的。

 以上的通信完全失败的RS-485距离极限343512米（9600bps）与数据位数有关，而且成正比例，就是说用CAN2.0（29位）比CAN1.0（11位）的极限更加大，大一倍以上。

到这里，大家一定会惊讶RS-485通信距离理论极限之短。互联网、手机、GPS是如何传输几乎无限远距离的呢？为了实现远程通信，互联网和手机通信几乎无法做到实时，而GPS对延时的计算及其精确。以后将另外专文讨论。

Thomson Linear slide sled 511H20C0DG2

MEAN WELL HRP-150-48 POWER SUPPLY

MOXA C32044 8 PORT RS-232 MODULE W/FEMALE DB25 CONNECT

MOXA C32047 8 PORT RS-232 EXTEND. MODULE W/FEMALE DB25

SMC PSE510-R07 Pressure Sensor

Intel Pentium D 925 Duo-Core 3.0GBz 2x2MB cache - 

APPLIED MATERIALS P/N 3480-00317 MOUNT LEVEL FOOT SWIV

TOKYO ELECTRON LIMITED 1986-409155-11 CT 3P MA8 Y DR.EX

National Instruments PC-DIO-24 Digital Card 180710-01

LAM RESEARCH 853-010409-007 CPU EPROM

COMPAQ STORAGEWORKS SAN SWITCH "8 EL"

AVAGO TECHNOLOGIES AFBR-775BEPZ TRANSCIEVER

LSI SAS3442E-R STORAGE CONTROLLER RAID

SUN 540-5206-11 73GB FC 40PIN ULTRA 10K RPM HDD CHEETAH

THERMOLYNE MAXI-MIX 1 TYPE 16700

ADVANTECH PCL-8442 /110 8 Port Isolated Converter

LABLINE INSTRUMENTS MODEL 137-455

THE BACK LIGHT FOR X-RAY VIEWING BL1218 19'' X 13''

SAMIGON 12'' X 9'' X-RAY VIEWER

INTEL DELTA ELECTRONICS DPS-750EB A REV

Humphrey Solenoid H110-4E1-PSL-1L "24 volt" 2 IN1

LSI SAS3442E-R STORAGE CONTROLLER RAID L3-01094-04A

LSI SAS3442E-R STORAGE CONTROLLER RAID L3-01094-02D

INTEL PRO/100S DESKTOP LOW PROFILE ADAPTER PN : 22P471

TROEMNER STAINLESS STEEL CALIBRATION WEIGHT 1KG.

FAULHABER- MICRO DRIVE MOTOR AM15X0038

TROEMNER STAINLESS STEEL CALIBRATION WEIGHT 500grams

METTLER CALIBRATION WEIGHT 1000 GRAMS

Alacritech SES2102ET iSCSI Accelerator PCI Express x4- 

ALACRITECH SES1811XT Single Port PCI-X Copper iSCSI Ac

ALACRITECH SEN1812XT Dual Port PCI-X Copper Gigabit Acc

DELL RAID-CONTROLLER PERC3 POWEREDGE 1650 - 7F134

TROEMNER STAINLESS STEEL CALIBRATION WEIGHT 500grams

OMEGA MODEL 650 TYPE J THERMOCOUPLE THERMOMETER

DELL AP603 POWER DIST. UNIT
SIEMENS SIMATIC TERMINAL BLOCK 6ES7 193-1CL00-0XA0

SIEMENS 6ES7 193-0CD40-0XA0

Advantech PCM-9682 REV A1 MAIN BOARD

Advantech PCM-9683 REV.A2 MotherBoard

ADVANTECH PCA 6108 PC BUS BACKPLANE

ETASIS EFRP-2463 CHASSIS ONLY

27" Lead Screw and Bearing G5-444-0024

OLYMPUS U-CMAD3 adapter to connect with TV cam and trin

NORGREN R17-600-RGLA REGULATOR WITH GAUGE

APPLIED MATERIALS P/N 3860-00528 TUBE -8000-T-001