I have a few old APC Masterswitch Power Controller with AP9606 Web/SNMP Management Card stored away in my garage for years…

Finally I found some use for them and I wanted to update the firmwares before I install them for good.

What’s needed:
Tripp-Lite USB to DB9 Adapter – https://www.tripplite.com/support/usa19hs
Plugable USB Serial Adapter – https://plugable.com/products/pl2303-db9
DB9 Null Modem Female to Female adapter – https://a.co/d/dl8Q76C

On MacOS(Monterey v12.5), I had to download and install the driver for Tripp-Lite USB to DB9 adapter and use the following command to connect to APC Masterswitch:

screen /dev/tty.usbserial-1410 2400,cs8,-ixon

I did some web searching and found the following firmwares:

• aos309a.bin – APC OS for AP9606(download link below)
• ms225a.bin – Masterswitch Application(download link below)

I followed the ftp instruction for firmware update – https://www.apc.com/us/en/faqs/FA156047/

First, once I get logged into the AP9606 via Serial connection, I figured out the MAC address then assigned IP via BOOTP with:

apc -s 192.168.?.? <MAC Address>

Then uploaded MasterSwitch APP, v2.2.5.a via ftp then Web/SNMP Management Card AOS v3.0.9.a then disabled BOOTP and configured static IP TCP/IP