First line: Boeing* Document 422CFCR3498 Reversed Four Channel RS-232 RS-422 Converter Model 422CFCR RS-232 RS-422 Converter converts unbalanced RS-232 signals balanced RS-422 signals. RS-422 Standard uses balanced voltage digital interface allow communications bits second cable lengths 4000 feet. receivers conAbstract: .. Model 422CFCR. The RS-232 RS-232 to RS-422 RS-422 Converter converts unbalanced RS-232 RS-232 signals to balanced RS-422 RS-422 signals. The RS-422 RS-422 Standard uses a balanced voltage digital interface to allow communications .. Tags: Boeing*telephone copper wires datasheetRS-422datasheet abstract..