Citizen CL-S621 Communication Error Diagnostic Report -... | terminalfaults.org

Technical Background:

Communication relies on serial (RS-232) or USB protocols. Potential issues include: voltage drops impacting signal integrity, incorrect baud rate settings, electrostatic discharge (ESD) affecting data transmission, and signal attenuation due to cable length or damage.

Symptoms:

Intermittent communication errors reported between the Citizen CL-S621 printer and the connected card terminal or point-of-sale system.

Possible Causes:

Loose or damaged communication cable (USB or serial).
Incorrect baud rate or communication protocol settings on the printer or host system.
Electrostatic discharge (ESD) affecting the communication port or internal components.
Driver incompatibility or corruption on the connected system.
Software conflicts or resource allocation issues on the card terminal.
Power fluctuations or inadequate power supply to the printer.

Solution:

1

Safe Handling: Power down the Citizen CL-S621 and the connected card terminal or point-of-sale system.
2

Inspect the communication cable (USB or serial) for any physical damage or loose connections. Reseat the cable at both ends.
3

Verify the correct baud rate and communication protocol settings on both the printer and the connected system. Consult the Citizen CL-S621 manual for default settings.
4

Test with a known good communication cable to rule out cable failure.
5

Check the printer driver on the connected system. Reinstall or update the driver from the Citizen website.
6

Ensure the Citizen CL-S621 is connected to a stable power source. Test with a different power outlet.
7

Restart both the Citizen CL-S621 and the connected system.

Safety Warning:

Avoid touching the communication ports on the printer or connected system during operation to prevent ESD. Ensure proper grounding of all equipment. Do not attempt to open the printer casing; this could damage the device and void the warranty.

Prevention:

Implement the following measures: secure the communication cable to prevent strain; clean the printer and surrounding area regularly with a dry, anti-static cloth; ensure the printer is connected to a dedicated power outlet or surge protector; keep the printer away from sources of electrostatic discharge.

Expert Tip:

If using a serial connection, check the DTR/DSR or RTS/CTS flow control settings. Incorrect flow control can cause communication errors. Also, try connecting a USB isolator between the printer and the host system to mitigate ESD issues.

Frequently Asked Questions

•What is the current baud rate setting on the printer and the connected device?

Check the printer configuration and the POS system settings.

•Has the printer driver been recently updated or changed?

Roll back or update the driver to a known stable version.

•Are other devices experiencing similar communication issues in the same area?

If so, investigate potential EMI or power issues in the environment.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the current baud rate setting on the printer and the connected device?

•Has the printer driver been recently updated or changed?

•Are other devices experiencing similar communication issues in the same area?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: