---
title: "requestSystemCode(completionHandler:)"
framework: corenfc
role: symbol
role_heading: Instance Method
path: "corenfc/nfcfelicatag/requestsystemcode(completionhandler:)"
---

# requestSystemCode(completionHandler:)

Sends the Request System Code command, as defined by the FeliCa card specification, to the tag.

## Declaration

```swift
func requestSystemCode(completionHandler: @escaping @Sendable ([Data], (any Error)?) -> Void)
```

```swift
func requestSystemCode() async throws -> [Data]
```