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So, even if you use an opto, you won’t be isolated because the interface is supplying the voltage. I guess the problem is that the rig doesn’t supply any power since it’s only a two wire interface (signal and ground). I’d think that doing this with optoisolators would be ideal. It’s odd that I didn’t find any that use optoisolators. It’s a nice design, but I don’t think it will fit in a DB9 shell.
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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. As long as the DATA line is high, any device can initiate communication by. The DATA line is held high when there is no traffic. The single wire consists of a communications line (DATA) and a ground reference (GND). The page on CI-V level converters has links to many different circuits, including a relatively complicated one using the MAX232 chip. ICOM's CI-V protocol is based on a relatively simple bi-directional, single-wire TTL level signaling system.
#Icom ci v interface usb manual
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.