Glenn, You "should" be alright. You're driving a lot of CAT5, but since the data is only at 9600 baud you should be OK. The 1PPS on the DCD line will be fine too. To blink an LED you just need to buffer the 1PPS signal coming out of the UT+ as it does not have enough drive capacity. Just about anything will work: IC buffer or inverter (I use standard 74LVC04's in my designs) or just a simple xstr inverter or emitter follower.
Randy -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Glenn Sent: Thursday, May 04, 2006 11:56 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Oncore 1pps driver & LED I am hoping someone can help me with some basic electronic questions about hooking up the Oncore UT+. I have a MAX233CPP two channel rs232 driver. I presume I can use the second channel to drive the 1pps on DCD line. Yes? I'll have a run of about 30-50' of CAT5, which *should* work. I should be able to adjust the 1PPS offset on the Oncore to account for this, plus the delay of the MAX233. The 7805 +5v voltage regular appears to be plug&play. I don't think I'll need a heat sink for it. The Linux PPS driver appears to only support kernel 2.4. And, I'd rather stick with a stock kernel on that box anyway. So, I'll follow Geoff's advice and run FreeBSD on an old Compaq for my timeserver. But, I'll probably test everything out on my linux box before I get around to building the FreeBSD box. I'd like to put an LED near the Oncore module that blinks on the 1pps. What's the best way to wire this up? thanks, glenn _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts