How cash drawers work with AADOPS
A cash drawer connected to AADOPS opens automatically every time a cash sale is completed on the POS. This eliminates the need for the cashier to manually open the drawer — reducing the chance of forgetting to close it and improving transaction speed at busy counters.
Supported cash drawer connections
Most cash drawers connect in one of two ways:
Via receipt printer (most common) — the cash drawer plugs into a dedicated port on the receipt printer using an RJ11 cable. When AADOPS sends a print command to the printer, the printer sends an electrical signal to open the drawer. This is the most reliable setup and requires no additional configuration in AADOPS beyond having a working receipt printer.
Direct USB connection — some cash drawers connect directly via USB. These require a driver and may need specific configuration.
Setting up a printer-connected cash drawer
- Connect your cash drawer to the receipt printer using the RJ11 cable (looks like a wide telephone cable)
- Ensure your receipt printer is set up and working in AADOPS (see receipt printer setup)
- Go to Settings → Hardware → Cash drawer
- Select Connected via receipt printer
- Click Test open — the drawer should open
- Click Save
When the drawer opens
Once configured, the cash drawer opens automatically when a cash sale is completed on the POS. It does not open for card or transfer payments — only cash transactions. You can also open it manually by clicking Open drawer on the POS screen, which is useful for giving change or beginning a shift count.