If some person know who produce this type of converters please advise. Thank

 

Try Adam modules. Adam produces many analog modules to communicate RS422, RS232, etc.

 

goto www.phoenixcon.com and look under MCR modules.

 

BIE Networks is a master distributor for Patton Electronics, a major manufacturer of interface converters, including TTY to RS232 Converters (see attached catalog page). Visit their web site at www.pattom.com or contact me for further info at (Tel) 703-860-1322 or (E-mail) [email protected].