智能电表是怎样实现数据传输的？ - 知乎
智能电表的另一种数据传输方式就是采用RS485通讯方式，这种数据传输的RS485通讯方式，依靠GPRS或者 CDMA网络 传输数据，再依靠RS485下发到电表，十亿合伙人智能电表就是采用 …
MAX485 signal mystery | Forum for Electronics
Aug 25, 2016 · The RS485 link receives valid data which is correctly parsed in the breadboard dcircuit. The RX line receives data (see attachment 3: scope printout), the DE line is properly …
rs485工作站一对多出现数据接受丢失，这是rs485的缺陷还是正常 …
RS485中继功能 由于485总线传输距离的延长，或者485总线中的485设备的增多，会使得485信号不断的衰减，最后可能导致485总线不稳定甚至不能使用，智嵌物联RS485集线器可以对已有 …
Master/slave 8051 network through serial port
Oct 11, 2006 · RS485 bus is a bidirectional bus (half duplex), use P1.7 to control bus direction, P1.7=0 ->75176 receive data, P1.7=1 ->75176 transmit data. At stand by condition, set Master …
电表通讯方式有哪些？通讯协议有哪些？ - 知乎
Oct 18, 2019 · 电表通讯方式主要分为有线和无线两种，有线以RS485以及以太网为主。无线有NB WIFI GPRS等。 通讯协议有645协议，国网376.1，modbus等
Confusion with RS485 data Tx+, Tx-, Rx+, Rx-, A, B, Y, Z
May 16, 2008 · The RS485 is a bidirectional communication so there is no meaning to use Tx+ or Tx- alone & the best notation is A, B. But unfortunately here i have to use different …
RS-485 与 RS-232的区别（总结），看了就明白 - 知乎
Mar 18, 2021 · 而RS-485接口在总线上是允许连接多达128个收发器。 即具有多站能力,这样用户可以利用单一的RS-485接口方便地建立起设备网络。 因为RS485接口组成的半双工网络，一般 …
Water flow meter with RS485 | Forum for Electronics
May 5, 2004 · I need to design a system to measure the water consumption of separate apartments in a building. I have to install a flow sensor in different pipes with say 1.5" dia. I will …
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RS485终端电阻的作用及其在实际应用中的分析和解决方案。
Is the provided RS485 terminal the GND or Shield?
Jan 7, 2019 · So what is the GND terminal really connected to? Is it connected to the GND of RS485 side or the the node shown as shield in the schematics (where there is an RC parallel …