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HART协议简介
- HART协议由Rosemount公司开发且已向每个使用者开放HART协议采用标准的Bell 202频移键控信号以1200波特通信以低电平加载于4mA~20mA模拟信号上,由于载波信号的平均值为零所以它对模拟信号没有影响。-HART agreement develops by Rosemount Corporation also opened the HART agreement to each user to use the standard the Bell 202 frequency-s
结构修改1
- 基于c8051f330芯片开发的电机正反转控制系统,能同时完成参数的设定与显示,系统具有4~20mA的标准模拟信号输出-c8051f330 chip development based on the reversion motor control system parameters can be completed simultaneously with the creation shows that the system has a 4-20mA analog signal output st
zhiliudianliuyuan
- 本系统以直流电流源为核心,AT89S52单片机为主控制器,通过键盘来设置直流电源的输出电流,设置步进等级可达1mA,并可由数码管显示实际输出电流值和电流设定值。本系统由单片机程控输出数字信号,经过D/A转换器(AD7543)输出模拟量,再经过运算放大器隔离放大,控制输出功率管的基极,随着功率管基极电压的变化而输出不同的电流。单片机系统还兼顾对恒流源进行实时监控,输出电流经过电流/电压转变后,通过A/D转换芯片,实时把模拟量转化为数据量,再经单片机分析处理, 通过数据形式的反馈环节,使电流更加稳定
IDC3516
- IDC3516-4-20mA电流环隔离接口芯片的应用-IDC3516-4-20mA current loop isolation Application Interface Chip
liuliangjibiao
- PIC16F876单片机,有4到20MA电流输出,低功耗等特点,使用于工业仪表行业-PIC16F876 microcontroller, to a four 20MA current output, low power consumption and other characteristics, Instrumentation used in industrial sectors
220
- 显字数显表源程序,拿来就可以用,采集4~20MA电流,-significant source of wordage a table, can be taken out, collecting 4-20MA current,
4-20mA-PWM
- 8051驱动LED的4至20毫安的PWM程序。C环境
4-20mApwmout
- 工业仪表常用到4-20mA输出此程序通过C51单片机模拟输出PWM 提供了很好的思路和事例
small_size_karin.rar
- karin 数码相框小尺寸的方案的线路图和bom表,Digital Photo Frame karin small size of the circuit diagram of the program and table bom
AD421.rar
- 数字接口转4-20MA 电流环接口软件,包括控制软件及芯片资料,Digital interface to 4-20MA current loop interface software, including control software and chip information
a.rar
- PWM经过RC滤波产生电压,经过XTR115产生4-20mA电流输出,要点是XTR115的电压输入问题,自身为两线制,+5V输出提供不了较大电流,需要用DCDC,RC滤波采用钽电容和4.7k-4.9k的低温漂电阻能得到较高线形度,PWM输出为AVR单片机16位,模式15,不分频,PWM voltage generated through RC filter, after XTR115 have 4-20mA current output, the key points of the voltag
test_AD421.rar
- AD421 是美国ADI 公司推出的高性能模数转换器,其优良特性使其被广泛应用于各种智能变送器中及其他工 业控制场合中AD421程序,产生4到20MA电流,,AD421 procedures, resulting in 4 to 20mA current
4
- 照片自动分类归并,自动读取照片文件的exif信息(delphi),有利于按日期进行整理归档。-collect photo files according to the date
PWM-convert-4-20ma-output
- 将单片机PWM信号变送成工业标准电流输出4-20mA -The microcontroller PWM signal transmission into industry standard 4-20mA current output
rtu
- 低功耗水资源控制器RTU 支持8路0-20mA模拟输入A/D转换功能,主要用于驳接投入式液位计以及其它任何形式的模拟信号的处理-Low-power water controller RTU supports 8-channel 0-20mA analog input A/D conversion function, mainly used for connecting the input level gauge and any other form of analog signal proces
ADC
- 将4路模拟量4-20mA电流信号通过I\V变换将信号送至AD模块, 实现数模转换,送入单片机,经单片机处理后,再次通过DA转换和V\I变换, 输出,最后连接一个远程通讯模块连接至上位机。(The 4 analog 4-20mA current signal is transmitted to the AD module via the I\V transform, Realize digital to analog conversion, into the microcontroller,
MODBUS转20mA电流环
- RS232 转 4-20mA电流环原理图;工业品;(RS232 conver to current LOOP)
4-20ma current loop transmitter
- 4-20ma current loop transmitter
4-20ma RTD
- 可测量和处理来自 2 线、3 线和 4 线电阻式温度检测器的温度信号输入,并输出与来自 RTD 输入的所处理的温度相对应的 4 至 20 mA 电流回路信号,并进行系统级的校准以提高 ADC 和 DAC 精度。(It can measure and process the temperature signal input from the 2-wire, 3-wire and 4-wire resistive temperature detector, and output the 4-20 m
4-20mA XTR111正式版
- STM32 硬件PCB 图纸 输出4-20MA电流信号 采集频率信号(STM32 hardware PCB drawing outputs 4-20mA current signal and collects frequency signal)