Support

Getting help with Serial Terminal

Frequently Asked Questions

My USB-to-serial adapter isn't showing up.

Open System Information → USB and confirm the adapter is enumerated. Most adapters (FT232, CP2102) are class-compliant on macOS. CH340/CH341 based cables need the WCH driver installed. The port appears as /dev/tty.usbserial-* or /dev/tty.wch*: re-plug the adapter and restart the app if it does not appear in the port list.

Data is garbled or unreadable.

This is almost always a baud-rate or framing mismatch. Confirm the baud rate, data bits, parity, and stop bits match the device (common: 9600 8N1 or 115200 8N1). For RS485 multi-drop buses, also verify termination resistors and that only one device is driving the line.

I see no data at all.

Double-check the port is selected (not just listed) and that the correct serial pins are connected: RS232 crossover vs. null-modem matters. For 3.3V/5V TTL adapters, confirm logic-level and ground are common with the device. Toggle the line and watch the hex view; a flat line means no electrical signal.

How do I view raw bytes in hex?

Switch the display mode to Hex to see every byte in hexadecimal alongside an ASCII column. Mixed mode shows both. Hex mode is required for binary protocols (Modbus RTU, custom frames) where control bytes are not printable.

My license key doesn't work.

Enter the full key including dashes (format: VOLTRUS-SERIAL-XXXX-XXXX-XXXX). An internet connection is required during first activation so the app can validate the key once. After activation, the app works offline. If it still fails, contact support below.

The app crashes or freezes.

Make sure you're running macOS 13 (Ventura) or later. Unplug and replug the adapter, then reconnect the port. If the issue persists, contact support with your macOS version, the app version, and the adapter chipset (FT232, CH340, CP2102, etc.).

Contact Support

Email

For bug reports, feature requests, license issues, or general questions.

[email protected]

Please include:

  • Serial Terminal version (find in app → Info)
  • macOS version
  • Mac model (Intel or Apple Silicon)
  • Adapter chipset and the device/protocol you are talking to
  • Steps to reproduce the issue

Response Time

We reply within two business days. A full fix for a complex issue may take longer.

Refund Policy

Direct purchases (card via Polar, bank transfer, QRIS): Contact us at the email above within 14 days of purchase for a full refund. No questions asked. Full details: Refund Policy.