Quoth Hal Murray at 2008-03-06 20:07... >> I will be doing (4) as soon as I've found the time to make up a TTL to >> RS232 board. > > I suggest trying it without anything fancy. > > All the GPS toys I've tried work fine without any conversion gear. > > The normal TTL to RS-232 chips include an inverter. That will break things > unless you add another inverter. (or your gear expects an inverter) > > The usual switching point for RS232 receiver chips is 1.4 volts. That's the > switching point for TTL inputs, 2 diode drops above ground. That works fine > for 3V CMOS drivers. > >
So my Trimble ACE II and Moto Oncore modules will tolerate RS232 levels without conversion? Are we absolutely sure on this - I don't want to fry anything! Cheers M -- Matthew Smith Smiffytech - Technology Consulting & Web Application Development Business: http://www.smiffytech.com/ Personal: http://www.smiffysplace.com/ LinkedIn: http://www.linkedin.com/in/smiffy _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.