微電腦型RS-485顯示電表(24*48mm/48*96mm) 特點: 5位數(shù)RS-485顯示電表 顯示范圍-19999-99999位數(shù) 通訊協(xié)議Modbus RTU模式 寬范圍交直流兩用電源設(shè)計 尺寸小,穩(wěn)定性高 主要規(guī)格: 顯示范圍:-19999~99999 digit RS-485傳輸速度: 19200/9600/4800/2400 selective RS-485通訊位址: "01"-"FF" RS-485通訊協(xié)議: Modbus RTU mode 顯示幕: Red high efficiency LEDs high 10.16 mm (0.4") (MMX-RS-11X) Red high efficiency LEDs high 20.32 mm (0.8") (MMX-RS-12X) Red high efficiency LEDs high 10.16 mm (0.4")x2 (MMX-RS-22X) 參數(shù)設(shè)定方式: Touch switches 記憶方式: Non-volatile E²PROM memory 絕緣耐壓能力: 2KVac/1 min. (input/power) 使用環(huán)境條件: 0-50℃(20 to 90% RH non-condensed) 存放環(huán)境條件: 0-70℃(20 to 90% RH non-condensed) CE認證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上傳時間: 2015-01-03
上傳用戶:feitian920
微電腦型單相交流集合式電表(單相二線系統(tǒng)) 特點: 精確度0.25%滿刻度±1位數(shù) 可同時量測與顯示交流電壓,電流,頻率,瓦特,(功率因數(shù)/視在功率) 交流電壓,電流,瓦特皆為真正有效值(TRMS) 交流電流,瓦特之小數(shù)點可任意設(shè)定 瓦特單位W或KW可任意設(shè)定 CT比可任意設(shè)定(1至999) 輸入與輸出絕緣耐壓 2仟伏特/1分鐘( 突波測試強度4仟伏特(1.2x50us) 數(shù)位RS-485界面 (Optional) 主要規(guī)格: 精確度: 0.1% F.S.±1 digit (Frequency) 0.25% F.S.±1 digit(ACA,ACV,Watt,VA) 0.25% F.S. ±0.25o(Power Factor) (-.300~+.300) 輸入負載: <0.2VA (Voltage) <0.2VA (Current) 最大過載能力: Current related input: 3 x rated continuous 10 x rated 30 sec. 25 x rated 3sec. 50 x rated 1sec. Voltage related input: maximum 2 x rated continuous 過載顯示: "doFL" 顯示值范圍: 0~600.0V(Voltage) 0~999.9Hz(Frequency)(<20% for voltage input) 0~19999 digit adjustable(Current,Watt,VA) 取樣時間: 2 cycles/sec. RS-485通訊位址: "01"-"FF" RS-485傳輸速度: 19200/9600/4800/2400 selective RS-485通信協(xié)議: Modbus RTU mode 溫度系數(shù): 100ppm/℃ (0-50℃) 顯示幕: Red high efficiency LEDs high 10.16 mm(0.4") 參數(shù)設(shè)定方式: Touch switches 記憶型式: Non-volatile E²PROM memory 絕緣抗阻: >100Mohm with 500V DC 絕緣耐壓能力: 2KVac/1 min. (input/output/power) 1600 Vdc (input/output) 突波測試: ANSI c37.90a/1974,DIN-IEC 255-4 impulse voltage 4KV(1.2x50us) 使用環(huán)境條件: 0-50℃(20 to 90% RH non-condensed) 存放環(huán)境條件: 0-70℃(20 to 90% RH non-condensed) CE認證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上傳時間: 2015-01-03
上傳用戶:幾何公差
集合式直流電能表(小功率的) 特點: 精確度0.05%滿刻度±1位數(shù) 可同時量測與顯示/直流電壓/電流/瓦特(千瓦)/瓦特小時(千瓦小時) 電壓輸入(DC0-99.99V/0-600.0V)自動變檔功能 顯示范圍0-9999(電流/瓦特/千瓦),0至99999999(八位數(shù)瓦特小時)可任意規(guī)劃 數(shù)位RS-485 界面 (Optional) 主要規(guī)格: 輔助電源消耗功率:<0.35VA(DC12V/DC24V) <0.5VA(DC48V) <1.5VA(AC90-240V(50/60Hz)) 精確度: 0.05% F.S. ±1 digit (23 ±5℃) 輸入范圍:Auto range(DC0-99.99V/0-600.0V(DC voltage)) 輸入抗阻:>5MΩ(DC voltage) 取樣時間:10 cycles/second(total) 過載顯示: " doFL " 顯示值范圍: 0-9999 digit(DCA/W(KW)) 0-9999999.999 digit(WH/(KWH)) RS-485傳輸速度: 19200/9600/4800/2400 selective RS-485通訊位址: "01"-"FF"(0-255) RS-485通信協(xié)議: Modbus RTU mode 溫度系數(shù): 50ppm/℃ (0-50℃) 顯示幕:Bight Red LEDs high 10.16 mm(0.4") 參數(shù)設(shè)定方式: Touch switches 記憶方式: Non-volatile E²PROM memory 絕緣耐壓能力:2KVac/1min.(input/output)(RS-485(Isolating)) 1600 Vdc (input/output) (RS-485(Isolating)) 使用環(huán)境條件: 0-50℃(20 to 90% RH non-condensed) 存放環(huán)境條件: 0-70℃(20 to 90% RH non-condensed) CE認證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上傳時間: 2013-11-20
上傳用戶:s363994250
The data plane of the reference design consists of a configurable multi-channel XBERT modulethat generates and checks high-speed serial data transmitted and received by the MGTs. Eachchannel in the XBERT module consists of two MGTs (MGTA and MGTB), which physicallyoccupy one MGT tile in the Virtex-4 FPGA. Each MGT has its own pattern checker, but bothMGTs in a channel share the same pattern generator. Each channel can load a differentpattern. The MGT serial rate depends on the reference clock frequency and the internal PMAdivider settings. The reference design can be scaled anywhere from one channel (two MGTs)to twelve channels (twenty-four MGTs).
上傳時間: 2013-12-25
上傳用戶:jkhjkh1982
SPI(Serial Peripheral Interface,串行外圍接口)是Motorola公司提出的外圍接口協(xié)議,它采用一個串行、同步、全雙工的通信方式,解決了微處理器和外設(shè)之間的串行通信問題,并且可以和多個外設(shè)直接通信,具有配置靈活,結(jié)構(gòu)簡單等優(yōu)點。根據(jù)全功能SPI總線的特點,設(shè)計的SPI接口可以最大發(fā)送和接收16位數(shù)據(jù);在主模式和從模式下SPI模塊的時鐘頻率最大可以達到系統(tǒng)時鐘的1/4,并且在主模式下可以提供具有四種不同相位和極性的時鐘供從模塊選擇;可以同時進行發(fā)送和接收操作,擁有中斷標志位和溢出中斷標志位。
標簽: SPI 接口的設(shè)計
上傳時間: 2013-11-11
上傳用戶:himbly
SL811開發(fā)資料_包含源程序_電路圖_芯片資料:SL811HS Embedded USB Host/Slave Controller.The SL811HS is an Embedded USB Host/Slave Controller capable of communicate with either full-speed or low-speed USB peripherals. The SL811HS can interface to devices such as microprocessors, microcontrollers, DSPs, or directly to a variety of buses such as ISA, PCMCIA, and others. The SL811HS USB Host Controller conforms to USB Specification 1.1.The SL811HS USB Host/Slave Controller incorporates USB Serial Interface functionality along with internal full-/low-speed transceivers.The SL811HS supports and operates in USB full-speed mode at 12 Mbps, or at low-speed 1.5-Mbps mode.The SL811HS data port and microprocessor interface provide an 8-bit data path I/O or DMA bidirectional, with interrupt support to allow easy interface to standard microprocessors or microcontrollers such as Motorola or Intel CPUs and many others. Internally,the SL811HS contains a 256-byte RAM data buffer which is used for control registers and data buffer.The available package types offered are a 28-pin PLCC (SL811HS) and a 48-pin TQFP package (SL811HST-AC). Both packages operate at 3.3 VDC. The I/O interface logic is 5V-tolerant.
上傳時間: 2013-12-22
上傳用戶:a82531317
超聲波傳感器適用于對大幅的平面進行靜止測距。普通的超聲波傳感器測距范圍大概是 2cm~450cm,分辨率3mm(淘寶賣家說的,筆者測試環(huán)境沒那么好,個人實測比較穩(wěn)定的 距離10cm~2m 左右,超過此距離就經(jīng)常有偶然不準確的情況發(fā)生了,當然不排除筆者技術(shù) 問題。) 測試對象是淘寶上面最便宜的SRF-04 超聲波傳感器,有四個腳:5v 電源腳(Vcc),觸發(fā)控制端(Trig),接收端(Echo),地端(GND) 附:SRF 系列超聲波傳感器參數(shù)比較 模塊工作原理: 采用IO 觸發(fā)測距,給至少10us 的高電平信號; 模塊自動發(fā)送8個40KHz 的方波,自動檢測是否有信號返回; 有信號返回,通過IO 輸出一高電平,高電平持續(xù)的時間就是超聲波從發(fā)射到返回的時間.測試距離=(高電平時間*聲速(340m/s))/2; 電路連接方法 Arduino 程序例子: constintTrigPin = 2; constintEchoPin = 3; floatcm; voidsetup() { Serial.begin(9600); pinMode(TrigPin, OUTPUT); pinMode(EchoPin, INPUT); } voidloop() { digitalWrite(TrigPin, LOW); //低高低電平發(fā)一個短時間脈沖去TrigPin delayMicroseconds(2); digitalWrite(TrigPin, HIGH); delayMicroseconds(10); digitalWrite(TrigPin, LOW); cm = pulseIn(EchoPin, HIGH) / 58.0; //將回波時間換算成cm cm = (int(cm * 100.0)) / 100.0; //保留兩位小數(shù) Serial.print(cm); Serial.print("cm"); Serial.println(); delay(1000); }
上傳時間: 2013-11-01
上傳用戶:xiaoyuer
用途:測量地磁方向,測量物體靜止時候的方向,測量傳感器周圍磁力線的方向。注意,測量地磁時候容易受到周圍磁場影響,主芯片HMC5883 三軸磁阻傳感器特點(抄自網(wǎng)上): 1,數(shù)字量輸出:I2C 數(shù)字量輸出接口,設(shè)計使用非常方便。 2,尺寸小: 3x3x0.9mm LCC 封裝,適合大規(guī)模量產(chǎn)使用。 3,精度高:1-2 度,內(nèi)置12 位A/D,OFFSET, SET/RESET 電路,不會出現(xiàn)磁飽和現(xiàn)象,不會有累加誤差。 4,支持自動校準程序,簡化使用步驟,終端產(chǎn)品使用非常方便。 5,內(nèi)置自測試電路,方便量產(chǎn)測試,無需增加額外昂貴的測試設(shè)備。 6,功耗低:供電電壓1.8V, 功耗睡眠模式-2.5uA 測量模式-0.6mA 連接方法: 只要連接VCC,GND,SDA,SDL 四條線。 Arduino GND -> HMC5883L GND Arduino 3.3V -> HMC5883L VCC Arduino A4 (SDA) -> HMC5883L SDA Arduino A5 (SCL) -> HMC5883L SCL (注意,接線是A4,A5,不是D4,D5) 源程序: #include <Wire.h> #include <HMC5883L.h> HMC5883Lcompass; voidsetup() { Serial.begin(9600); Wire.begin(); compass = HMC5883L(); compass.SetScale(1.3); compass.SetMeasurementMode(Measurement_Continuous); } voidloop() { MagnetometerRaw raw = compass.ReadRawAxis(); MagnetometerScaled scaled = compass.ReadScaledAxis(); float xHeading = atan2(scaled.YAxis, scaled.XAxis); float yHeading = atan2(scaled.ZAxis, scaled.XAxis); float zHeading = atan2(scaled.ZAxis, scaled.YAxis); if(xHeading < 0) xHeading += 2*PI; if(xHeading > 2*PI) xHeading -= 2*PI; if(yHeading < 0) yHeading += 2*PI; if(yHeading > 2*PI) yHeading -= 2*PI; if(zHeading < 0) zHeading += 2*PI; if(zHeading > 2*PI) zHeading -= 2*PI; float xDegrees = xHeading * 180/M_PI; float yDegrees = yHeading * 180/M_PI; float zDegrees = zHeading * 180/M_PI; Serial.print(xDegrees); Serial.print(","); Serial.print(yDegrees); Serial.print(","); Serial.print(zDegrees); Serial.println(";"); delay(100); }
上傳時間: 2014-03-20
上傳用戶:tianyi223
S3C44BOX的BIOS。可使用的命令:help --- show help ? --- = help date --- show or set current date time --- show or set current time setweek --- set weekday clock --- show system running clock setmclk --- set system running clock setbaud ------ set baud rate ipcfg ------ show or set IP address load ------ load file to ram comload ------ load file from serial port run ------ run from sdram prog ------ program flash copy ------ copy flash from src to dst address boot ------ boot from flash backup ------ move bios to the top of flash md ------ show memory data move ------ move program from flash to sdram
上傳時間: 2015-01-22
上傳用戶:ANRAN
Altera recommends the following system configuration: * Pentium II 400 with 512-MB system memory (faster systems give better software performance) * SVGA monitor * CD-ROM drive * One or more of the following I/O ports: - USB port (if using Windows XP or Windows 2000) for USB-Blaster(TM) or MasterBlaster(TM) communications cables, or APU programming unit - Parallel port for ByteBlasterMV(TM) or ByteBlaster(TM) II download cables - Serial port for MasterBlaster communications cable * TCP/IP networking protocol installed * Windows 2000, Windows NT 4.0 with Service Pack 3 or later, or Windows XP * Internet Explorer 5.0 or later Memory & Disk Space Requirements USB開發(fā)
標簽: system configuration recommends following
上傳時間: 2015-03-27
上傳用戶:13188549192
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