---
title: kIOPropertySCSIParallelSignalingTypeKey
framework: DriverKit
role: symbol
role_heading: Macro
platforms: [DriverKit 20.0+, macOS 10.3+]
path: kernel/kiopropertyscsiparallelsignalingtypekey
---

# kIOPropertySCSIParallelSignalingTypeKey

## Declaration

```occ
#define kIOPropertySCSIParallelSignalingTypeKey
```

## Discussion

This key is associated with the signaling type used for this SCSI Parallel bus. Valid values include "High Voltage Differential", "Low Voltage Differential", and "Single Ended".

Requirement: Optional for SCSI Parallel Interface. Not defined for any other physical interconnect.

Example:

```occ
 
 
<dict>
   <key>Controller Characteristics</key>
   <dict>
   	<key>SCSI Parallel Signaling Type</key>
   	<string>High Voltage Differential</string>
   </dict>
</dict>
```