The vendor generously offered a refund and let me keep it to repair or dipose of.
I then bought what I thought was another Chase IOLAN RACK+, but it fact it was the non-rack DB25 version with external PSU.
I decided they probably had the same voltages, so I could swap the PSU around, and with a bit of metal bending get things working for the RACK model.
While prodding the RACK+ PSU with my voltmeter to work out how to splice in the new PSU it suddenly started working; I guess the problem is most likely dry joints.
Next I find that my RJ45-DB9 cisco console cables don’t work. I find the Cisco pinout at http://www.technick.net/public/code/cp_dpage.php?aiocp_dp=pincabser_cisco_9 and by conferring with the Chase manual, come up with this colour mapping.
| IOLAN | CISCO | RJ45 Names | RJ45 | DB9 | DB9 Names |
| 2 | Black | RTS | 1 | 8 | CST |
| 8 | Brown | DTR | 2 | 6 | DSR |
| 4 | Red | TXD | 3 | 2 | RXD |
| 6 | Orange | GND | 4 | 5 | GND |
| Yellow | GND | 5 | 5 | GND | |
| 5 | Green | RXD | 6 | 3 | TXD |
| 3 | Blue | DSR | 7 | 4 | DTR |
| 7 | White/Grey | CTS | 8 | 7 | RTS |
I cut off the RJ45 from the Cisco cables and make my own, which work fine!
So, as I crimp on a new RJ45, my colour mapping is:
NONE, BLACK, BLUE RED GREEN ORANGE WHITE BROWN
with yellow dangling/
Hurrah! I can now control 16 devices at once using debian’s cylcades-serial-client; all much more satisfactory that USB com ports which have given me no end of trouble.
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