---
name: "owctr"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/owctr"
---

# owctr(4)

1-Wire counter device

## NAME

**owctr** – 1-Wire counter device

## SYNOPSIS

**owctr\* at onewire?**

## DESCRIPTION

The **owctr** driver provides support for the externally triggered counters on the DS2423 chip. The supported chip contains a 4096-bit SRAM and four 32-bit counters. The two externally triggered counters are accessible by the [sysctl(8)](/sysctl/8.md) interface.

The following chips are supported by the driver:

- Maxim/Dallas DS2423

## SEE ALSO

[intro(4)](/intro/4.md), [onewire(4)](/onewire/4.md), [owsbm(4)](/owsbm/4.md), [owtemp(4)](/owtemp/4.md), [sysctl(8)](/sysctl/8.md)

## HISTORY

The **owctr** driver first appeared in OpenBSD 4.8.

## AUTHORS

The **owctr** driver was written by John L. Scarfone ⟨*john@scarfone.net*⟩.