The MAX232, like all RS-232 interface chips I have ever come across, inverts the signal.
Didier KO4BB > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] > Sent: Saturday, March 08, 2008 2:48 AM > To: [email protected] > Subject: Re: [time-nuts] Mounting GPS Antenna on Steel Roof > > > In a message dated 08/03/2008 03:57:02 GMT Standard Time, > [EMAIL PROTECTED] writes: > > The inverter is required because the Motorola GPS receiver > uses TTL and the PC serial port uses RS232. > > RS232 uses a positive voltage of +3 to +25 volts to indicate > a logic zero, and a negative voltage of -3 to -25 volts to > indicate a logic one. > > > > ----------- > > My Motorola Oncore test rig uses a Max232 to interface the RS232, no > inverter, and works fine. > > regards > > Nigel > GM8PZR > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.516 / Virus Database: 269.21.6/1316 - Release > Date: 3/6/2008 6:58 PM > > No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.21.6/1316 - Release Date: 3/6/2008 6:58 PM _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
