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For specific wiring requirements, refer to the instrument manufacturer’s installation manual.

For RS485 / RS422 Multidrop applications, it is essential that correct daisy-chain wiring is used:

We recommend and can supply B&B electronics convertors, specifically:

• For RS232 to RS485/RS422: Use 485OI9TB with 485 PS2 power supply. Note: the convertor must be plugged directly into the RS232 port on the PC or connected using a 9-pin extension cable that has all 9 wires connected.
• For USB connections we recommend UT04L.

The B&B convertors listed above support “Automatic send data control” and so work very well with SpecView.

We do not recommend using non-isolated port powered convertors or internal 485/422 cards in industrial applications.

See here for more details on RS232 / RS485 / RS422