RS-485 is a balanced drive (i.e., 2 floating wires). It would be better to power it up and see if the standard RS-232 signal levels are present on the proper pins (2 & 3) before doing anything else (assuming absence of a manual). I do not know if there is a standard pinout for RS-485 on a dsub 25 connector.
Bill....WB6BNQ Jack Hudler wrote: > It might be RS-485 and so multiple displaies could have its own address on a > multidrop setup. > About the only trick there is finding out if its 2 or 4 wire 485 (probably 2 > because of the address). > Think I've seen some USB to 485 converters on the market, but you might get > away with driving it with RS-232. > Go Google RS-485 > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Jason Rabel > Sent: Wednesday, May 23, 2007 6:06 PM > To: 'Discussion of precise time and frequency measurement' > Subject: [time-nuts] Kode 375-928 Display - Help! > > So off of an impulse (and low bid of $9.99) I bought a Kode 375-928 display > off eBay. No picture or anything in the auction, but I figured I would take > the chance and hopefully nobody else would bid. > > A huge box came today, and guess what was inside? This display has to be > about 3 to 4 feet long! It has 12 alpha-numeric type digits (broken up in to > three groups of four). > > The back interface has only a 25pin dsub connector along with jumpers for > baud rate select & address select. There's a couple more holes for > additional connectors but they are not installed. > > Inside it is pretty bare, there's the power supplies, PCB for the front > display digits, then another PCB with a bunch of socketed chips which I'm > guessing is the brains. > > I'll have to probe the (serial?) port tomorrow when I get to the office. > I'll also take some pictures, this thing is pretty cool looking. > > So, my question is... Does anyone have any sort of experience with these > kind of Kode displays? Or just a generic hunch about the interface? I was > thinking maybe it was a BCD port, but I've never seen one with a baud rate / > address selection. The only other Kode I have uses a simple BNC input for > IRIG-B. > > Jason > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
