IoT Protocol -- Modbus
2021-02-20.
Category & Tags:
IoT,
Modbus,
RS232,
RS485,
RS422,
Serial,
COM,
CAN1939,
MQTT,
Emulator,
Simulator
OSI vs. Modbus Layers: Tip: RS-485/RS485’s new name is EIA-485. UART usually (99%) means TTL in shops, not 232/485. DB9 physical port usually (90%) means 232 electrical signals level standards. Modbus Protocol # See Also： 【strongly recommend！】 a nice intro to Modbus and Modbus Enron. (Simply Modbus 软件收费，但是这个 Modbus 入门文档非常好) 一文看懂 Modbus 协议 Complete Modbus Guide. a good intro to Modbus. Each Modbus Slave has 4 tables with 9999 values in each table. ...