W&T connects
Interfaces for TCP/IP, Ethernet, RS-232, RS-485, USB, 20mA, glass and plastic fiber optic cable, http, SNMP, OPC, Modbus TCP, I/O digital, I/O analog, ISA, PCI
Product overview:

Isolators, Fibre Optic Interfaces and Line Drivers

USB Isolators

Serial Isolators and Line Drivers

Plastic optical fiber cable interfaces

Plastic fiber optic cable and cutting tool

Serial interfaces with glass fiber optic interface

Digital I/O interfaces with glass fiber interface