---
title: kIOMediumOptionHalfDuplex
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.12+]
path: kernel/1645757-anonymous/kiomediumoptionhalfduplex
---

# kIOMediumOptionHalfDuplex

## Declaration

```occ
kIOMediumOptionHalfDuplex = IFM_HDX
```