Digi Sm320 Service: Manual

The DIGI SM-320 Service Manual is a technical document provided to authorized dealers and technicians for the maintenance and repair of the SM-320 price computing scale. While specific proprietary service manuals are often restricted to DIGI authorized service centers, technical specifications and basic maintenance guides are available to help manage this high-speed thermal printing scale. Core Technical Specifications

is designed for fast retail environments and features both label printing and electronic cash register functions.

Capacity Options: Supports 3/6 kg, 6/15 kg, and 15/30 kg weighing capacities.

Connectivity: Standard interfaces include RS232, RJ45 (Ethernet), and RJ9 for cash drawers. Wireless IEEE 802.11a/b/g/n is available as an option.

Printer: High-reliability thermal head with a resolution of 203dpi and speeds up to 105 mm/sec. Memory: Comes with 2MB standard, expandable to 4MB or 8MB. Common Service & Maintenance Procedures

Technicians typically use the service manual to perform the following critical tasks: SM-320 | Retail | DIGI America

The SM-320 is a high-speed thermal printing scale available in Options include

202 x 32 pixel backlit FSTN LCD for both operator and customer. digi sm320 service manual

Standard 2MB (approx. 8,300 PLUs), expandable to 4MB or 8MB. Interfaces:

Includes 1x RJ45 (Ethernet), 1x RS232, and 1x RJ9 for a cash drawer. 2. Installation & Assembly SM-320P (Pole version) , the assembly involves connecting the customer display: Remove Studs:

Unscrew the four stud screws located beneath the scale base. Connect Cables:

Securely join the serial cables from the scale and the pole display. Ensure the side latches click to prevent pin damage. Secure Pole:

Align the pole with the fixing locations and reinsert the stud screws. 3. Service & Maintenance Procedures Label Loading:

Gently pull the side panel, open the print head panel, load the label roll onto the spool, and guide the labels through the designated path before closing. Memory Initialization: (Standard for SM-series) Hold while turning the scale ON, then press the total print key three times followed by the (Clear) key. Thermal Head Maintenance:

Clean the thermal head regularly to maintain a 100km life span. To calibrate the head, hold during power-up. 4. Calibration & Mode Settings The DIGI SM-320 Service Manual is a technical

Service manuals for DIGI SM scales typically require a physical Span Switch to be ON for calibration. Software Calibration:

The SM-320 supports software-based calibration for zero point and span adjustments. Spec Settings: by pressing

in sequence to access machine specifications (like Spec 141 for barcode formatting). 5. Troubleshooting Error Messages

The manual contains a full list of error codes. Common issues often relate to: SM-320 | Retail - DIGI (TERAOKA)

Table_title: Basic Table_content: header: | Model | SM-320 | | | | row: | Model: Capacity | SM-320: 3/6 kg | : 6/15 kg | : | : 15/ DIGI (TERAOKA) Digi SM-300P Scale Repair Guide - Calibration - Scribd

Important Note: The Digi SM320 is a legacy (discontinued) industrial cellular terminal/server. Digi International no longer produces this model. Official service manuals are proprietary and not publicly hosted on Digi’s main site. This guide teaches you how to work with the manual, where to find remnants, and what procedures it contains.

Chapter 2: Hardware Architecture

Firmware Updates: When and How

Digi periodically releases firmware updates to fix bugs or add features (e.g., new label formats). Before updating: Chapter 2: Hardware Architecture

Warning: Incorrect firmware can brick the scale. Unless you are an experienced tech, seek professional help.

4. Configuration via Serial (no software needed)

Use a terminal program (115200, 8N1, no flow control):

  1. Send +++ (no CR/LF) – wait for OK
  2. Send AT – should reply OK
  3. Set RF channel: ATCH 25 (for 2.4 GHz region)
  4. Set power: ATPT 30 (max 30 dBm = 1W)
  5. Save: ATWR

For Modbus mode (SM-320M): ATMT 1 enables transparent RTU mode.

Calibration Procedure Using the Digi SM320 Service Manual

Calibration is critical for legal-for-trade operation. You will need certified test weights (e.g., 1kg, 5kg, 10kg depending on your SM320 model).

Step 1: Enter Service Mode (as described above). Step 2: Navigate to Calibration Menu (often menu 30 or 88 – check your manual). Step 3: The display will show Unload. Ensure the platter is empty. Press [ENTER]. Step 4: The display will show Load XX.XX kg. Place the first test weight. Press [ENTER]. Step 5: If multiple points are required, repeat step 4. Step 6: The scale will save calibration to EEPROM. Exit service mode. Step 7: Verify with a test weight that the reading is within tolerance.

Pro tip: If your SM320 displays unstable readings after calibration, inspect the load cell mounting screws and ensure the scale is on a vibration-free surface.