Hi, thanks for the info. I'll definitely check out the RS-422 thing, I was suspicious that might be the case. I think I'll probably try the thing on 24V and see if it's willing to start. The power adapter I plan to use for it is one from a printer that puts out 31V, so it would probably work fine set for 24 or 48, I guess. I'll probably pop the PCB off and have a look at it, I'm curious to see what those switches control as well.
Thanks! Sam On Tue, Mar 1, 2022 at 4:41 PM Hal Murray <[email protected]> wrote: > > [email protected] said: > > Here are some pictures of the PSU and power connector area, if anyone > has any > > insight into what voltage this thing is expecting. What's confusing to > me is > > that the original marking, 20-72 V was crossed out, 48V written over the > top, > > and then the DIPs internally being set to 24A. I'm not really sure what > the > > A and B positions mean, either. > > I haven't worked with the Z816A. > > It was common for gear of that era to work with either 24 or 48V. The > input > range was typically 2:1. Thus 48 meant anywhere from 36V to 72V and 24 > meant > 18 to 36. > > I have no idea what the A in 24A means or what the manual would say about > the > switches. The label has a 24B so maybe there are 2 input connectors. If > it > was on my bench, I would take it apart and look at the bottom of the power > supply board and/or try to trace out the switches. That's not a high > power > switch so maybe it selects some switching mosfets. But I don't see any. > So > maybe the switch is good for the amp or 2 and maybe they run 2 in parallel. > > If it's designed for 24 or 48, it might not explode if run with 48 when > setup > for 24 so I wouldn't be too surprised if the label didn't match the > switches. > Maybe somebody tried it on 48 and it worked. > > > > Is the female DE9 on this wired so I can just plug a USB-Serial adapter > into > > it directly, like a Trimble Thunderbolt, or do I need to make a > null-modem > > cable? > > The Z3811/12, KS-24361 L101/2 units that were available a few years ago > send > RS-422 (5V differential pairs) on a 9 pin connector. > > I'd put a meter or scope on some of the pins. If you see 5V, the pinout > for > the KS-24361 should be in the archives. Mine worked with the right set of > direct connectios to a typical PC serial port. > > > > -- > These are my opinions. I hate spam. > > > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send > an email to [email protected] > To unsubscribe, go to and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
