---
name: "apcsmart-old"
section: "8"
platform: "linux"
package: "nut"
version: "2.8.5-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/apcsmart-old"
---

# apcsmart-old(8)

Driver for American Power Conversion Smart Protocol UPS equipment

## NAME

apcsmart-old - Driver for American Power Conversion Smart Protocol UPS equipment

## SYNOPSIS

**apcsmart-old** -h

**apcsmart-old** -a *UPS\_NAME* \[*OPTIONS*\]

**Note**\

This man page only documents the hardware-specific features of the apcsmart-old driver. For information about the core driver, see [**nutupsdrv**(8)](/nutupsdrv/8.md).

## SUPPORTED HARDWARE

apcsmart-old should recognize all recent APC models that use a serial protocol at 2400 bps. This is primarily the Smart-UPS, Matrix-UPS and Back-UPS Pro lines.

The driver attempts to support every bell and whistle of the APC reporting interface, whether or not this is strictly sensible.

Some older hardware may only report a handful of variables. This is usually not a bug—they just don’t support anything else.

## CABLING

This driver expects to see a 940-0024C cable or a clone by default. You can switch to the 940-0095B dual-mode cable support with the cable= definition described below.

If your 940-0024C cable is broken or missing, use this diagram to build a clone:

https://www.networkupstools.org/cables/940-0024C.jpg

## EXTRA ARGUMENTS

This driver supports the following optional settings in the [**ups.conf**(5)](/ups.conf/5.md):

**cable=940-0095B**

Configure the serial port for the APC 940-0095B dual-mode cable.

**sdtype=***num*

Use shutdown type *num*, according to this table:

0

soft shutdown or powerdown, depending on battery status

1

soft shutdown followed by powerdown

2

instant power off

3

power off with grace period

4

"force OB" hack method for CS 350

Modes 0 and 1 will power up the load when power returns. Modes 2 and 3 will keep the load turned off when the power returns.

Mode 4 exploits an oddity in the CS 350 models since they only seem to support the S command, but then only when running on battery. As a result, the driver will force the UPS to go on battery if necessary before sending the shutdown command. This ensures that the load gets reset.

## BUGS

Some older APC UPS models return bogus data in the status register during a front panel test. This is usually detected and discarded, but some other unexpected values have occasionally slipped through.

APC UPS models with both USB and serial ports require a power cycle when switching from USB communication to serial, and perhaps vice versa.

## AUTHORS AND HISTORY

Nigel Metheringham \<Nigel.Metheringham@Intechnology.co.uk\> (drawing heavily on the original apcsmart driver by Russell Kroll).

This driver was called newapc for a time and was renamed in the 1.5 series.

In 2.6.2 the driver was renamed to apcsmart-old, being superseded by updated version with new features which currently holds the apcsmart name.

## SEE ALSO

### The core driver:

[**nutupsdrv**(8)](/nutupsdrv/8.md)

### Internet resources:

The NUT (Network UPS Tools) home page: https://www.networkupstools.org/historic/v2.8.5/