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

# powervar\_cx\_ser(8)

Driver for Powervar UPM Series UPS equipment with Serial connection

## NAME

powervar\_cx\_ser - Driver for Powervar UPM Series UPS equipment with Serial connection

## SYNOPSIS

**powervar\_cx\_ser** -h

**powervar\_cx\_ser** -a *UPS\_NAME* \[*OPTIONS*\]

**Note**\

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

## SUPPORTED HARDWARE

This driver supports the Powervar UPM UPS family (devices with serial port connection). For USB connected UPM Series devices, see also [**powervar\_cx\_usb**(8)](/powervar_cx_usb/8.md).

## EXTRA ARGUMENTS

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

**startdelay**=*num*

Change startup delay time from 1 second default.

**offdelay**=*num*

Change shutdown delay time from 0 second default.

**disptesttime**=*num*

Change display test time from the 10 second default.

## INSTANT COMMANDS

This driver supports the following Instant Commands (see [**upscmd**(8)](/upscmd/8.md)):

### All GTS and UPM UPS units

**beeper.disable**

Disable the UPS beeper.

**beeper.enable**

Enable the UPS beeper.

**beeper.mute**

Temporarily mute the UPS beeper.

**shutdown.return**

Turn off the load possibly after a delay and return when power is back.

**shutdown.stop**

Stop a shutdown in progress.

**shutdown.reboot**

Shut down the load briefly while rebooting the UPS.

**shutdown.stayoff**

Turn off the load and remain off.

**test.battery.start.deep**

Start a "deep" battery test. This test runs the UPS until the low battery point and then returns to the AC line.

**test.battery.start.quick**

Start a "quick" battery test. The default time is 2 minutes. This time can be set in the **ups.conf** file. See **testime** above.

**test.battery.stop**

Stops a battery test that is in progress.

**test.failure.start**

Starts a simulation of an input power failure.

**test.failure.stop**

Stops a simulation of an input power failure.

### All UPM UPS units

**test.panel.start**

Start testing the UPS panel.

**reset.input.minmax**

Reset minimum and maximum input voltage status.

## WRITABLE VARIABLES

See [**upsrw**(8)](/upsrw/8.md) to see what variables are writable for the UPS.

## AUTHORS

• Bill Elliot \<bill@wreassoc.com\>

## SEE ALSO

For USB connected GTS and UPM Series devices, see [**powervar\_cx\_usb**(8)](/powervar_cx_usb/8.md).

### 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/