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

# umcs(4)

MosChip Semiconductor based USB multiport serial adapter

## NAME

**umcs** – MosChip Semiconductor based USB multiport serial adapter

## SYNOPSIS

**umcs\* at uhub?** **ucom\* at umcs?**

## DESCRIPTION

The **umcs** driver supports various MosChip Semiconductor based serial adapters.

The following devices should work with the **umcs** driver:

```
LogiLink AU0033
ST Lab U-360
ST Lab U-400
```

## SEE ALSO

[tty(4)](/tty/4.md), [ucom(4)](/ucom/4.md), uhub(4), [usb(4)](/usb/4.md)

## HISTORY

The **umcs** device driver first appeared in OpenBSD 5.7.