What is a Cash Drawer Detect Open Smart‑Sensor‑2❓

The Cash Drawer Detect Open Smart‑Sensor‑2 is a precision electronic sensor built to monitor the physical status of a cash drawer. Smart‑Sensor‑2 is engineered to operate in a normal open (NO) configuration.

The trigger uses a cash drawer physical sensor configured as normal open (NO)

Hardware Connection

• The cash drawer connects via RJ12 cable Plug to a USB trigger device RJ12 socket.
• Pin 3 and Pin 6 are typically used for the sensor signal lines (Normal Open).

Open and Closed State

• Open Detection with Return Code: When the drawer is open, the sensor outputs a specific return code (e.g., 00) that the POS system can read.
• Closed Detection: Once the drawer is shut, the return code stop, confirming the drawer is secure.
• POS Integration: Applications use these return codes to verify drawer state in real time.

POS Integration

• The POS system can read the sensor signal at any time.
• This enables real‑time verification of drawer status, ensuring transaction accuracy and security.

Smart Advantages

• Provides instant detection of drawer status.
• Enhances security by preventing unnoticed open drawers.
• Ensures transaction accuracy by aligning drawer state with POS activity.
• Simple, reliable, and easy to integrate into standard POS setups.

🔌 Connector Standards

Acode cash drawer triggers and related POS accessories typically use standard 4‑pin RJ11 or 6‑pin RJ12 connectors. The solenoid (which physically opens the drawer) is activated across Pins 2 & 4 or Pins 4 & 5.

🖨️ Hardware Compatibility

Acode triggers are designed to work with all standard printer‑driven cash drawers. Please see the pinout table below for reference

⚠️ Pinout Compatibility Notice

Most cash drawers follow the same standard pinout as Acode. However, some models use different pinouts. Incorrect pinout connections can damage the device.

👉 Always verify that the cash drawer pinout matches before connecting.

📐 RJ11 / RJ12 Pinout Configuration

A standard Acode‑compatible cash drawer pinout operates on 12V–24V DC and follows this layout:

• • The open/close detection function on Models Plus is supported via pins 3 and 6.

How to check cash drawer pin assignment ? 

1. (Right Meter) Check the Red Pin 2 and Pin 5  , Green Pin 4 wires  common on the solenoid shows a slight variation in readings.

2. (Left Meter) Check with the Pink Pin 3 and Black Pin 6 wire shows a significant difference between cash drawer open and closed.

• This cash drawer routine supports standard Epson and Star POS printer pin configurations, as well as all Acode cash drawer triggers.
• Important: You must verify the your cash drawer’s solenoid voltage and pin assignment before connecting it to your receipt printer or POS terminal or Acode cash drawer triggers.