I picked up a pair of Lucent GPS / oscillator devices off eBay (see
http://www.ebay.com/itm/LUCENT-SYMMETRICOM-Z3810AS-KS24361-L101-L102-HP-KIO-OEM-GPSDO-TIMING-SYSTEM-/321560316836?), along with a number of others from the time-nuts mailing list.
I cannot for the life of me get any data out of the RS422 diagnostic ports. I have tried a hack connecting the RX- and TX- ports to the RS232 TX and RX ports (which seems to have worked for everyone else). I have tried an RS422 to USB cable. I've tried an RS422 to RS232 plug convertor. Nothing works.
Yet, if I connect the box to the PC using the cable hack and put a scope on the TX-, I can send commands from a terminal program and decode RS232 data coming out (see attached) - just nothing gets back to the PC.
Has anyone encountered similar situations and have been able to solve them? I'm at a loss as to what to try next.
Anthony