Hello Group, I just bought four of the FE5680A's that have the standard configuration Pin 1+15, Pin 2 Gnd, Pin 3 Lock, Pin 4 +5V Pin 5 Gnd, Pin 6 1pps?, Pin 7 10MHz, Pin 8 TX, Pin 9 RX.
I have a LED with a 330 ohm current limiting resistor on pin 3 (the 74ACT240 can sink up to 24mA and I am well below that) for the lock indicator. All of my units lock and produce 10MHz although the 1pps never switches. I can not get any of the units to communicate using the DB-9 connections. I scoped the receive data into the unit all the way to the microcontroller. The RS232 and TTL levels for the data look perfect as well as the timing for 9600-N-8-1. However the unit never transmits any data.I scoped this all the way to the micro as well. Not a pulse spike or anything. Has anyone determined what the second serial interface is for? It seems to me that it would not make any sense for FE to install the RS232 port if it could not be used. Any hints? Thanks Sam W3OHM _______________________________________________ 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.
