Developed by CETT (Compagnie
Européenne de Télétransmission), CETT 20 (also known as ETC-20) enables communication between control stations and CETT-20 substations.
Its physical layer operates in standard mode with start bit, data bits,
parity and stop bit. Its link layer is almost identical to the HDLC protocol in
normal response mode.
Universal protocol converter for highest degree of flexibility