>> Well, one downside is that it's "free" plus the time, materials, and >> knowledge to make yourself a custom cable, do RS-232 level-shifting, >> and provide a voltage source. > >Perhaps I missed something here. But all I had to do was find a serial >header cable in my junk box, look up the Soekris header pin out, >match the connections, solder, and plug it in. For some odd reason it >JustWorks(tm). Didn't need an RS-232 level shifter.
The PPS signal is TTL rather than RS-232. (It's probably actually CMOS rather than TTL.) Some people think you need a level shifter. Reality says you don't, at least on most systems including mine and yours. I expect there are a few RS-232 ports that won't work. I think they may have tweaked the RS-232 specs to handle this case officially. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
