Multiple protocol, 2-channel,Bi-Directional,Serial Converter. Converts RS232C, 20mA Current Loop, and RS 422. Input any one of these protocols, and the TGC-1 will output all three! On board 120 VAC power supply. Available as a Board Only, Fiberglass Reinforced NEMA 4X compliant Enclosure or Stainless Steel NEMA 4X compliant enclosure.