>The normal RS-232 level shifter chip includes an inverter. (No good reason, >just historical, but with a long history.)
>I can't understand the schematic on the part Gary suggested. I'd use >something like this: > https://www.sparkfun.com/products/11189 Hal, Thanks, this had me look closer at the outputs and not all RS232 chip breakout boards shift all signals, it seems to be 4-6 lines at most. I've seen some MAX3232 (RS232 to TTL) converters, but the better ones only shift Rx, Tx, CTS, RTS, VCC and GND. If I read what was suggested here earlier correctly, I need DCD for the PPS signal and Rx, Tx for NMEA. I plan to use this with pfsense/gpsd which lets you choose between rising and falling edge for PPS signal processing. I'll go ahead and order https://www.sparkfun.com/products/11189 as it appears to do all RS232 signals and can handle voltages > 5V. Thank you all again! _______________________________________________ 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.
