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

# richcomm\_usb(8)

Driver UPS equipment using Richcomm dry-contact to USB solution

## NAME

richcomm\_usb - Driver UPS equipment using Richcomm dry-contact to USB solution

## SYNOPSIS

**richcomm\_usb** -h

**richcomm\_usb** -a *UPS\_NAME* \[*OPTIONS*\]

**Note**\

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

## SUPPORTED HARDWARE

The Richcomm dry-contact to USB solution is a generic interface that is used to upgrade an existing (RS-232) contact closure UPS interface to USB. As such, all the limitations of the underlying contact closure interface apply. This means that you will only get the essentials in ups.status: OL, OB, and LB. See also [**genericups**(8)](/genericups/8.md).

## BUGS

Most contact-closure UPSes will not power down the load if the line power is present. This can create a race when using secondary [**upsmon**(8)](/upsmon/8.md) systems. See the [**upsmon**(8)](/upsmon/8.md) man page for more information.

The solution to both of these problems is to upgrade to a smart protocol UPS of some kind that allows detection and proper load cycling on command.

## AUTHORS

• Peter van Valderen \<p.v.valderen at probu.nl\>

• Dirk Teurlings \<dirk at upexia.nl\>

## SEE ALSO

### The core driver:

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

### The generic serial driver:

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

### Internet resources:

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