Hardware Overview — Castle S4
Card Present › Castle S4 › Hardware Overview
A labelled guide to every component on the Castle S4 terminal
📐 ANNOTATED DIAGRAMFront view — 7 callouts: (1) Touchscreen display, (2) NFC/contactless zone (centre), (3) Chip card slot (bottom), (4) Magnetic swipe slot (right side), (5) Power button (right side), (6) Volume/function keys, (7) Menu icon (top-left of app screen)
📐 ANNOTATED DIAGRAMSide & back view — 5 callouts: (1) Charging port under rubber flap, (2) Thermal printer output (top), (3) Ethernet port (base), (4) USB port, (5) Bluetooth antenna location
Front Panel
| Component | Location | Function |
|---|---|---|
| Touchscreen display | Centre of device | Full-colour display for all transaction flows, menus, and result screens |
| NFC / contactless zone | Centre of screen | Customer taps card or mobile wallet here for contactless transactions |
| Chip card slot | Bottom edge | Insert chip card (gold chip facing up) for Chip & PIN transactions |
| Magnetic swipe slot | Right side | Swipe legacy cards without a chip |
| Power button | Right side | Hold 2–4 seconds to power on/off |
Ports and Connectivity
| Port / Connector | Location | Function |
|---|---|---|
| Charging port | Under rubber flap, next to power button | Connect power cable for charging. This rubber flap must be kept closed when not charging. |
| Ethernet port | Base of device | Optional wired internet connection (faster and more reliable than Wi-Fi for high-volume counters) |
| USB port | Base or side | Reserved — do not connect any devices without TWPayz instruction |
| Wi-Fi | Built-in (no port visible) | Primary internet connection method — configured during setup |
| Bluetooth | Built-in | Available for compatible peripherals if enabled by TWPayz |