Introduction - If you have any usage issues, please Google them yourself
MODBUS protocol Chinese Version (HD version) serial link and TCP/IP on the introduction of the standard MODBUS standard includes two MODBUS communication protocol used in the application layer protocol and service specification: serial link MODBUS MODBUS serial link depends TIA/EIA standards :232-F and 485-A. TCP/IP on the MODBUS MODBUS TCP/IP depends on IETF standards: RFC793 and RFC791 related.