Without a full schematic diagram about the only thing I can ask is if yuremembered that for RS232 the control and data signals are reversed.
For rs-232 Tx and Rx use a negative (low) for a logic "one". But DCD uses the other convention with a positive meaning one.. So if you can see the serial data you have that correct. try flipping the RS422 wire for the control signal. On Sun, May 19, 2013 at 2:03 PM, Miguel Barbosa Gonçalves <[email protected]> wrote: > Hi! > > I am struggling trying to convert my Acutime's PPS signal from RS422 to > RS232 for NTP use. > > I am using this converter: http://www.dpieshop.com/quatech > -sscvt500n-rs232-to-rs422485-serial-converter-p-282.html and I connected > > - Port A (T+) to R+ on the converter > - Port A (T-) to R- on the converter > - PPS+ to T+ on the converter > - PPS- to T- on the converter > > On the RS232 part of the converter > > - TXD (pin 3) to computer pin 1 (DCD) > - RXD (pin 2)to computer pin 2 (RXD) > - GND (pin 5)to computer pin 5 (GND) > > all other pins are connected to the same pin on the computer except for the > DCD on the converter which is not connected. > > I can see the serial time code on the computer yet the PPS (a long 400 ms > one) doesn't seem to reach the computer. > > I've tried everything I could remember off and connecting the RS422 PPS+ > pin directly to the computer makes the NTP daemon stop randomly and losing > the PPS signal. I really think I need to convert the PPS signal (30 meters > long cable). Without PPS and using this converter NTP works fine. The > problem is the jitter I am getting. > > I think I've exhausted every option with this converter and found this > converter: http://www.ko4bb.com/~bruce/GPS_RS232_RS422_Transceiver.html. > > I might try it. Anyone here tried it or has any input for this situation?? > > I also think that from a time nut perspective building my converter instead > of using a black box will enable me to see what is the delay in the signal > conversion. > > Any help would be highly appreciated. > > Kind regards, > Miguel > _______________________________________________ > 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. > -- Chris Albertson Redondo Beach, California _______________________________________________ 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.
