![]() It not only describes the physical interface, but the command set as well. ![]() This is an article written in 1986 describing the CI-V interface. This is a nice little circuit using a couple of 2N2222s, two diodes, and four resistors. The page on CI-V level converters has links to many different circuits, including a relatively complicated one using the MAX232 chip. This is a complete online manual to the interface and the software driving it. The last time I got the urge, I did a web search and came up with the following: The signal levels are TTL-level signals and it’s a two-wire interface. This isn’t as easy as it sounds as the Icom CI-V interface is not a standard RS-232 type interface. Every once in a while, I get the urge to build a computer interface for my IC-735.
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