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# APC AP7921
AP7921 is a 1U 8-outlets switched PDU from APC.
* No per-out metering.
* Outlet is C14; Input is C20.
* Although spec says 220V input, 110V also works.
* AVR control plane.
* Only supports old cipher like 3DES.
* The meter precision is lower than AP7921B.
* The console is menu-based and is pretty hard to use (AP7921B is console-based).
## Console Cable
AP7921 has a reset button, but it only allows temporary logon to the serial
console via default username and password (`apc` / `apc`). It won't reset web
portal password. Thus, you have to get a console cable if you loss the password.
Even worse, APC uses the wired RJ12 connector for console rather than RS232 or
RJ45. Instead of buying a cable, I highly recommend you to make your own.
Ingredients:
* RJ12 male connector: Must be 4pin / 6pin. 2pin RJ11 won't work.
* RS232 female connector
Wiring:
```
RS232 F RJ12 M
┌──┐
┌─────────┐ ┌┴──┴┐
│5 4 3 2 1│ ┌─┘ └─┐
└┐9 8 7 6┌┘ │ 654321 │
└───────┘ └────────┘
Female 5GND Male
Front Facing
GND 5──────────5
TX 2───────────4
RX 3────────────3
GND 5─────────────2
```
Taken from
[pinoutguide.com/UPS/apc_940-0144a_cable_pinout.shtml](https://pinoutguide.com/UPS/apc_940-0144a_cable_pinout.shtml)
but swapped RX and TX.
Serial parameters:
* Baud rate: 9600
* No stop bit
You need to press enter several times for the login prompt to show up.
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