See Littelfuse Commercial Vehicle Products Products
Communication Board - One RS-232C port.
Optical Link Module - SYSMAC C500 - Panel Mount - Host Link Unit.
Fiberoptic Remote I/O System, Sysmac Remote Master Modules
Low Cost Ethernet Adapter
Communications Interface Units
Communications ASCII Basic Module - 24-kbyte RAM - 2 RS-232C ports - IP30.
Compobus/s Master CAP-RS232.
Ethernet Module for DVP-SV, SA2, SX2 left side module
Adapter Card Stand Alone RS232 To 422/485 Converter
PLC Communication Module Sa-Canopen-A DC 24V (A)