1.上拉电阻(Pull-Up Resistor):上拉电阻将信号引脚连接到正电压源上,使引脚在空闲状态下保持高电平。上拉电阻的值通常为1kΩ到10kΩ。 2.下拉电阻(Pull-Down Resistor):下拉电阻将信号引脚连接到负电压源上,使引脚在空闲状态下保持低电平。下拉电阻的值通常也为1kΩ到10kΩ。 三、上下拉电阻的选择 在选择上...
Standard interface RS485,pull-up and pull-down resistor,whose value is 4.7K,have been set to A/B line.Transmission Specifications Item Operating Conditions Value Data Rate 9600bps (max.)Transceiver Switching Delay The delay time from the receiving data switch to the send data :30μs(min.),...
l Connect up to 32nodes on one bus l Isolation power output +5V TD311D485H/TD511D485H series are transceiver isolation module with integrated duplex power isolation,electrical isolation,and RS485interface bus protector ;Products can be easily embedded in the user equipment,achieve function of RS...
The RS485 communication circuit comprises a bus power supply, a MAX485 interface chip, an optical coupler U22, pull-up resistors R1 and R4, a pull-down resistor R2 and a resistor R3, wherein the first pin of the MAX485 interface chip is connected with the data receiving end of a CPU, ...
Single RS485isolated transceiver module RoHS FEATURES ●Small size,SMD package ●Integrated high efficiency isolated DC/DC converter ●Two-port isolation(2.5kVDC)●High baud rate up to19.2kbps ●Operating temperature range:-40℃to +85℃●The bus is able to support 64nodes at maximum ●Set ...
RS-485 Pull-up andPull-down Resistor 2.2KΩ HardwareProtection ESD-IEC61000-4-2Level 4 Air±15KV, contact±8KV Surge-IEC61000-4-5level 3 ±2KV EFT-IEC61000-4-4Level 3 ±2KV Software Parameters Network Protocol IP/TCP/UDP/ARP/ICMP/IPV4/DHCP/DNS IP Mode Static IP, DHCP Modbus Gateway...
RS485电阻的使用(短距离传输)在自动化领域，随着分布式控制系统的发展，迫切需要一种总线能适合远距离的数字通信。在RS-422标准的基础上，EIA研究出了一种支持多节点、远距离和接收高灵敏度的RS-485总线标准。RS-485标准采有用平衡式发送，差分式接收的数据收发器来驱动总线，具体规格要求：1. 接收器的输入电阻RIN...
RS-485 Pull-up and Pull-Down Resistor 2.2 KΩ Software Virtual Serial (USR-VCOM) Windows 2000 or higher (32 bit/64 bit) Configuration Built-in webpage, computer set-up software, serial command Basic Parameter Size 80 x 62 x 24 mm Operating Temp. -40 ~ 85°C Storage Temp. -45 ...
This problem can be solved by placing a combination of pull-up and pull-down resistors at one position on the bus. Figure 9 shows the biasing resistor circuit. An example of calculating R1 and R2 is shown below (assume RT= 120 Ω): ...
RS-485 Pull-up and Pull-down Resistor 2.2 KΩ Device Interface Antenna Interface 50Ω/SMA-K (female terminal) SIM Card 1.8V / 3V Speech Interface Null Software Virtual Serial(USR-VCOM) Windows 2000 or higher (32 bit/64 bit) Configuration Serial AT command, network AT command, ...