RS-232 Interfaces (1-16 Ports) PCI, ISA, USB, PC/104 PCMCIA, & Ethernet Expansion. www.sealevel.com

RS-232/422/485 Converters Telebyte is the worldwide leader in RS232, 422 485 Interface Converters www.telebytedatacom.com

Wireless scada Modems MaxStream radios for RS232 & RS485 Long range, low power, low cost www.maxstream.net

Korenix Media Converters JetCon RS232 to RS422/485 converter industrial to fiber/ RS232 to USB www.korenix.com