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The hardware (Sunmi D3 Pro)🔗

PosCaisse is an Android application. It installs on certified point-of-sale terminals. This guide was produced on a Sunmi D3 Pro, a desktop register terminal very widespread in food service.

The D3 Pro is a dual-sided terminal: a large 15.6" screen on the cashier side, and a secondary 10.1" screen on the back, facing the customer.

  • Sunmi D3 Pro — cashier side

    Cashier side — the main 15.6" screen where orders are taken and payment is processed.

  • Sunmi D3 Pro — customer side

    Customer side — the 10.1" display on the back, facing the customer.

Tip

Click on an image to open it full screen.

The essentials to remember🔗

Element Detail
System SUNMI OS (based on Android 13), Android updates supported
Screen 15.6" FHD 1920 × 1080, 10-point capacitive touch, landscape
Use Fixed register terminal on the counter
Connectivity Gigabit LAN, Wi-Fi 2.4/5 GHz, Bluetooth 5.0, USB ports + cash drawer port (RJ12)

Full technical sheet (SUNMI D3 PRO)🔗

Characteristic Specification
Product model F3510
Operating system SUNMI OS (based on Android 13) — Android version updates supported
Processor Qualcomm hexa-core, up to 2.4 GHz
Memory 4 GB RAM + 64 GB ROM
Screen 15.6" FHD 1920 × 1080, 10-point capacitive touch
Speaker 1 × 3 W
Wired network LAN 1000M (Gigabit)
Wi-Fi 2.4 GHz & 5 GHz — IEEE 802.11 a/b/g/n/ac
Bluetooth BT 5.0, BLE supported
Button 1 × power button (screen lock; fingerprint recognition optional)
Power adapter Input: AC 100~240 V / 1.5 A · Output: DC 24 V / 1.5 A / 36 W
External memory 1 × MicroSD (TF card) up to 1 TB
Ports 1× USB-A 3.0 · 2× USB-A 2.0 · 1× serial RJ11 · 1× cash drawer RJ12 · 1× RJ45 LAN · 1× audio jack · 1× power · 1× USB-C 2.0 · 1× MicroUSB (debug)
Weight D3 PRO: 4.5 kg · Separate 10.1" monitor: 0.88 kg
Environment Operation: 0 °C ~ 40 °C · Storage: -20 °C ~ 60 °C
Indicator light Blue (power)
Accessories Separate 10.1" HD 1280 × 800 monitor, multi-point capacitive touch screen
Dimensions (L×W×H) 380 mm × 195 mm × 310 mm

What matters for PosCaisse

  • The RJ12 cash drawer port allows the direct connection of the drawer (automatic opening on cash payment — see Configure the peripherals).
  • The USB ports and the RJ45 / Wi-Fi serve the printers (receipt, kitchen) and the multi-register network.
  • The fingerprint recognition (optional) can be used for employee login (see Employees).
  • The 10.1" customer screen (accessory) corresponds to the configurable customer display in Configure the peripherals.

PosCaisse is not limited to this model

The Sunmi D3 Pro serves as an example for this guide. PosCaisse runs on other compatible Android terminals. The principles (sales screen, payment, configuration) are identical regardless of the hardware; only the hardware options (built-in printer, drawer…) may vary.

The peripherals that PosCaisse controls🔗

Around the register, PosCaisse can control several peripherals. Their configuration is detailed in the chapter A8. Configure the peripherals:

  • Receipt printer(s) — for the customer receipt.
  • Kitchen printer(s) — to send preparation orders to the kitchen.
  • Cash drawer — opens automatically during a cash payment.
  • Barcode scanner — to scan products.
  • NFC reader — for employee badges.
  • Payment terminal — for card payments.
  • Customer display — the screen facing the customer that shows the amount.

Taking care of the register🔗

Best practices

  • Keep the register plugged into mains power during service.
  • Regularly check the paper level of the printers.
  • Connect the register to a stable Wi-Fi network (essential for online ordering, multi-register and cloud backup).
  • Shut down/restart the register cleanly (some operations, such as enabling database encryption, require a restart to take effect).

You now know the essentials. Let's get to practice with Part A — Admin journey: configuring your register from A to Z.