1. Introduction
Thank you for choosing the CAS SW-RS SW-1RS Series Portion Control Scale. This scale is designed for precise weighing in various commercial settings, including restaurants, cafeterias, and farmer's markets. It functions as both a POS interface scale and a portion control scale, offering versatility and accuracy. This manual provides essential information for the proper setup, operation, and maintenance of your device.
2. Important Safety Information
- Always place the scale on a stable, level surface to ensure accurate readings.
- Do not expose the scale to extreme temperatures, direct sunlight, or high humidity.
- Avoid dropping or subjecting the scale to strong impacts.
- Use only the specified AC adapter or batteries.
- Keep the scale away from water and other liquids to prevent electrical shock or damage.
- Do not attempt to disassemble or repair the scale yourself. Contact qualified service personnel.
3. Package Contents
Verify that all items are present in the package:
- CAS SW-RS Scale Unit
- Stainless Steel Platter
- AC Adapter
- User Manual (this document)
4. Setup Guide
- Unpacking: Carefully remove all components from the packaging.
- Placement: Place the scale unit on a firm, level, and stable surface, free from vibrations and drafts. Ensure adequate space around the scale for operation.
- Platter Installation: Gently place the stainless steel platter onto the scale base. Ensure it sits securely and does not wobble.
- Power Connection:
- AC Power: Connect the provided AC adapter to the scale's power input port and then plug it into a standard electrical outlet.
- Battery Power: If using batteries (not included), open the battery compartment, insert 6 x 1.5V batteries (e.g., D-cell) according to the polarity markings, and close the compartment.
- Initial Power On: Press the POWER button to turn on the scale. The display will perform a self-test and then show '0.00' or '0.0'.

Image 1: CAS SW-RS SW-1RS Series Portion Control Scale
5. Operating Instructions
5.1 Basic Weighing
- Power On/Off: Press the POWER button to turn the scale on or off.
- Zero Function: If the display does not show '0.00' when the platter is empty, press the ZERO button to reset it to zero. This compensates for minor weight variations on the platter.
- Tare Function: To weigh an item in a container, first place the empty container on the platter. Press the TARE button. The display will reset to '0.00'. Now, place the item to be weighed into the container; the display will show only the net weight of the item.
- Unit Switching: Press the UNIT button to cycle through available weighing units: Lb (pounds), g (grams), kg (kilograms), oz (ounces).
- Weighing Items: Place the item(s) to be weighed directly on the platter or in a tared container. Read the weight displayed on the LCD.
5.2 POS Interface (RS-232)
The CAS SW-RS scale features an RS-232 interface for communication with Point of Sale (POS) systems or Electronic Cash Registers (ECRs). This allows for seamless data transfer of weight measurements.
- Connect the scale to your POS system using a compatible RS-232 cable (9-pin DB Female connector).
- Ensure your POS software is configured to recognize and communicate with the CAS SW-RS scale. Refer to your POS system's documentation for specific setup instructions.
- The scale communicates weight data in Lb, Kg, and Oz units only when connected via RS-232.
6. Maintenance and Cleaning
- Cleaning: Wipe the scale body with a soft, damp cloth. For the stainless steel platter, use a mild detergent and water, then dry thoroughly. Do not use abrasive cleaners or immerse the scale in water.
- Battery Replacement: If the 'Batt' indicator appears on the display, replace the batteries promptly to ensure continuous operation. Refer to the 'Setup Guide' for battery installation instructions.
- Storage: When not in use for extended periods, store the scale in a clean, dry environment. If using battery power, remove batteries to prevent leakage.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Scale does not turn on. | No power, dead batteries, or faulty AC adapter. | Check AC adapter connection. Replace batteries if using battery power. |
| Inaccurate or unstable readings. | Scale not level, vibrations, drafts, or damaged load cell. | Ensure scale is on a stable, level surface. Avoid drafts. If problem persists, contact support. |
| Display shows 'Err' or other error codes. | Overload, internal error, or malfunction. | Remove any weight exceeding capacity. Power cycle the scale. If error persists, contact support. |
| POS system not communicating with scale. | Incorrect cable, port, or software settings. | Verify RS-232 cable connection. Check POS software configuration and port settings. |
8. Technical Specifications
| Feature | Specification |
|---|---|
| Brand | CAS |
| Model Number | SW-RS (10LB) |
| Weighing Capacity (Lbs) | 10 x 0.005 lbs |
| Weighing Capacity (Oz) | 160 x 0.1 oz |
| Weighing Capacity (Kg) | 5 x 0.002 kg |
| Weighing Capacity (g) | 5000 x 2 g |
| Display Type | LCD (1 Inch, 5 Digit) |
| Keys | Zero, Tare, Unit, Power |
| Interface | RS-232 (9-pin DB Female) |
| Power Source | DC 9V (1.5V x 6 ea) / AC Adapter Included |
| Operating Temperature | -10°C to 40°C / 14°F to 104°F |
| Platter Material | Stainless Steel |
| Platter Size (W x D) | 9.05" x 7.48" |
| Dimensions (W x D) | 10.23" x 11.29" |
| Item Weight | 1 Pounds (Unit only) / 6.92 lbs (Shipping) |
9. Warranty and Customer Support
CAS Corporation provides a limited warranty for its products. Please refer to the warranty card included with your purchase or visit the official CAS website for detailed warranty terms and conditions.
For technical assistance, troubleshooting, or service inquiries, please contact CAS Customer Support:
- Website: www.casscale.com (Please check for regional support contacts)
- Phone: Refer to the contact information on the official CAS website for your region.
When contacting support, please have your scale's model number (SW-RS (10LB)) and purchase date available.





