MPL-B540K-MJ74AA 无刷伺服电机产品 AB

　　MPL-B540K-MJ74AA 无刷伺服电机产品 AB

　　MPL-B540K-MJ74AA 无刷伺服电机产品 AB

　　产品介绍

　　型号名称：MPL-B540K-MJ74AA

　　现场电力应用要求：

　　1．主控中心计算机控制各机房多台rs485设备

　　2．各机房之间总距离大于1200米，最远处20000米。

　　3．通信速率9600bps

　　4．走线利用现有网线或屏蔽线

　　建议方案：

　　现场设备均为rs485接口，多台设备节点较多，需要进行rs485总线组网；同时总距离超过rs485的1200米要求，需要延长其距离，即需要rs485中继的功能；同时为了保证通信效果，避免外部环境电磁干扰的影响，故此建议选用带屏蔽的4芯电缆或现有网线。

　　综上所述，采用485a2+这款产品较为合适。

　　485a2+实现rs-232/rs-485转换和中继，通信距离双向延长至2×1.2km（9600bps时）。其外形中间接口带rs-232和rs-485，同时外接5v电源以增加通用性。特别适合于rs-485多机通信，使用485a2+组网可以突破传统rs-485的距离和节点的限制！原理描述见专利201420502117《一种带中继功能的串口转换装置》。

　　方案优势：

　　1.总线布线极其简单，需要中继或转换的rs-232/rs-485口（蓝色）与rs-485总线（红色）并不直接相接。最远两端可以用485a，也可以用485a2+.

　　2.本产品均无需任何初始化设置！只用到rxd（收）、txd（发）、gnd（地）信号，加上的内部零延时自动收发转换技术，确保适合所有软件！建议rs-485通信时一定要接地线。

　　3.可以任意延长和开叉。一般rs-485只能够布线为总线型，但是接了485a2+以后由于产品有3个rs-485口所以可以将rs-485继续1分2的开叉，而且岔路开可以继续开叉。

　　4、设备可以是rs485口也可以是rs232口。由于485a2+的中间有rs485和rs232口，所以接哪一个口到设备都可以，这样接线非常灵活。

　　product introduction

　　model name: MPL-B540K-MJ74AA

　　on site power application requirements:

　　1. the computer in the main control center controls multiple rs485 devices in each machine room

　　2. the total distance between each machine room is more than 1200 meters, and the farthest distance is 20000 meters.

　　3. communication rate 9600bps

　　4. use the existing network cable or shielded wire for wiring

　　recommended scheme:

　　all field devices are rs485 interfaces, and there are many equipment nodes, so rs485 bus networking is required; at the same time, if the total distance exceeds the requirement of 1200 meters of rs485, the distance needs to be extended, that is, the function of rs485 relay is required; at the same time, in order to ensure the communication effect and avoid the influence of electromagnetic interference in the external environment, it is recommended to select shielded 4-core cable or existing network cable.

　　to sum up, 485a2 + is more suitable.

　　485a2 + realizes rs-232 / rs-485 conversion and relay, and the communication distance is extended to 2 in both directions × 1.2km (at 9600bps). the shape of the middle interface with rs-232 and rs-485, while external 5v power supply to increase versatility. it is especially suitable for rs-485 multi machine communication. using 485a2 + networking can break through the limitations of traditional rs-485 distance and nodes! see patent 201420502117 "a serial port conversion device with relay function" for principle deion.

　　advantages of the scheme:

　　1. the bus wiring is extremely simple. the rs-232 / rs-485 port (blue) requiring relay or conversion is not directly connected with the rs-485 bus (red). 485a or 485a2 + can be used at the farthest ends

　　2. this product does not need any initialization settings! only rxd (receive), txd (send), gnd (ground) signals are used, and the unique internal zero delay automatic transceiver conversion technology ensures that it is suitable for all software! it is suggested that rs-485 communication must be grounded.

　　3. it can be extended and forked at will. generally, rs-485 can only be wired as the general line type, but after 485a2 + is connected, since the product has three rs-485 ports, the rs-485 can continue to be split in two, and the fork can continue to be split.

　　4. the device can be rs485 port or rs232 port. since there are rs485 and rs232 ports in the middle of 485a2 +, you can connect any port to the equipment, so the wiring is very flexible.