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A, use the configuration software for monitoring project, mainly from the field instrument data, the instrument has 485 interface, but not the instrument type of configuration software, how to read the instrument data (the 485 communication mode)?
1, the force control itself has driven this instrument, which is the most simple way (generally no instrument driver).
2, the force control without driving, but the instrument is to support Modbus protocol, that according to the Modbus communication go (if the instrument support standard Modbus communication protocol, the force control of Modbus communication can be driven directly. The serial parameters are set correctly.)
3, no driving force control, instrument of communication protocol, then in force control by a scripting programming to solve the communication problem (instrument manufacturers command parameters and response data format, buy a 232 to 485 conversion line, then directly connected to your computer is also OK).

Two, 485 and MODBUS what is the relationship?
RS458 can be understood as a physical link, Modbus is an application layer protocol.

Three, the standard 485 interface is what mean
RS485 uses a differential signal negative logic, +2V ~ +6V says "0", 6V ~ - 2V said "1". RS485 has two line and four line two line, four line is a full duplex communication mode, the two line is the half duplex communication mode.