e-serial-parityFTP-539

Error e-serial-parity Fujitsu FTP-539: Connection Issue

The Fujitsu FTP-539 Thermal error e-serial-parity indicates a mismatch in serial communication parameters between the device and the host. This parity error usually occurs when bits, parity, or transmission speed (baud rate) settings differ between the printer and the point-of-sale controller. To fix the e-serial-parity error in the FTP-539, verify that communication settings are identical on both systems.

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Common causes

  • 1Baud rate mismatch between host and printer.
  • 2Incorrect parity bit setting (even, odd, none).
  • 3Damaged serial cable or poor grounding.
  • 4Electromagnetic interference from unshielded cabling.

Solutions

Quick Diagnosis

The error appears when the printer receives corrupted data failing the configured parity rules. If the unit prints garbled text or locks up when a ticket is sent, the diagnosis is a configuration mismatch.

Step-by-Step Solution

  1. Check wiring: Verify the serial cable is firmly connected at both ends and free of physical damage or fraying.
  2. Adjust parameters: Access the configuration menu or dip-switches and adjust speed, parity, and bits to match your host software requirements.
  3. Restart communication: Reboot both the printer and the POS terminal to force a fresh handshake sequence.

Prevention and Maintenance

Avoid using extra-long (over 3 meters) unshielded serial cables, as they pick up electromagnetic noise. Perform regular communication health checks in environments prone to interference.

When to Call a Technician

If after verifying all settings and cables the printer still shows a parity error, the printer's internal serial interface board might be electrically damaged.

Technical Specifications

  • Technology: Thermal Printing
  • Interfaces: Serial (RS232), USB
  • Connectivity: Protocol-configurable
  • Compatible consumables: Standard thermal paper
  • Recommended use: Complex POS system integration
  • Official Drivers / firmware

Steps to follow

  1. 1

    Check wiring

    Verify the serial cable is firmly connected at both ends and free of physical damage.

  2. 2

    Adjust parameters

    Enter the printer configuration menu and ensure baud rate, parity, and bits match the host software settings.

  3. 3

    Restart communication

    Restart both the printer and the host terminal to refresh the data handshake process.

Frequently asked questions

It occurs due to a mismatch in parity, baud rate, or bit settings between the printer and the host device.

Check your POS software manual to see the required communication settings and update the printer's dip-switches accordingly.

This error is communication-based; standard thermal paper works fine, though you should minimize static-prone environments.

Yes, if settings are correct, a worn-out serial cable can cause bit errors leading to parity mismatches.

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