FT991A Rig Control

Version 1c  |  Windows 10 / 11  |  No Installation Required

This version of the FT991A Rig Control program is being released to experienced users willing to help test the software and report problems. Your feedback will help improve the program before the final release.

What the Program Does

📻
Live VFO Display Real-time frequency, mode, and band for both VFOs with S-meter bar.
🎛️
Full Radio Control Set frequency, mode, band, filter, volume, squelch, RF gain, mic gain, and TX power.
🔁
VFO & Split Select, swap, and copy VFOs. Full split TX/RX with adjustable TX offset.
💾
30 Memory Slots Save, recall, and manage favorite frequencies, modes, and filters.
🔍
Frequency Scanner Auto-scan a range and pause on signals above a set S-unit threshold.
🛡️
TX Safety Timeout Automatically drops transmit if the radio keys beyond a set time limit.

What's in the ZIP

FilePurpose
FT991A_RigControl_V1c.exe The program. Double-click to run — no installer needed.
FT991A_Setup.docx Full setup and user guide with Device Manager screenshots and troubleshooting.
FT991A_Tips.docx Tips and tricks for getting the most out of the program.
991a_Control_Settings.json Created automatically on first run. Saves your COM port, baud rate, and slider positions between sessions.
991a_memories.json Created automatically on first run. Stores your 30 memory / favorite frequency slots.
991a_log.csv Created automatically on first run. Rolling 30-day log of events and errors.
Keep all files in the same folder. The program reads and writes the .json and .csv files from whichever folder the .exe lives in. Do not move the .exe out of the folder on its own.

Version 1c Instructions

1
Download the ZIP file Click the Download button below and save the ZIP file to your computer.
2
Extract the files Right-click the ZIP and choose Extract All. Keep all the extracted files together in the same folder. Do not run the .exe directly from inside the ZIP.
3
Configure your radio's CAT settings On the FT991A, press MENU then select SETUP. Navigate to these two menu items and set them as shown:
  • Menu 031 — CAT RATE: set to 38400 bps
  • Menu 032 — CAT TOT: set to 1000 msec
These settings must match the program or the connection will fail.
4
Connect your radio Connect your FT991A to the computer using a USB cable. Windows 10/11 installs the Silicon Labs CP210x USB driver automatically — no separate driver download is needed.
5
Find your COM port Open Windows Device Manager and expand Ports (COM & LPT). Look for Silicon Labs CP210x USB to UART Bridge “Enhanced” COM Port (COM X). Write down that COM number — you will need it in the program. See FT991A_Setup.docx for screenshots and additional setup steps.
6
Run the program Double-click FT991A_RigControl_V1c.exe. (You will get warning about opening it, open it anyway.) Select your Enhanced COM port from the dropdown, set Baud to 38400, make sure RTS is checked, then click Connect.
7
Test and report Operate the program normally. Report any problems, unexpected behavior, or suggestions using the feedback links at the bottom of this page.

⚠️ Version 1c Software Notice

This software is a build provided for testing purposes only. Unexpected behavior is possible. Use caution when transmitting and always monitor your station. The program does not modify any radio firmware or internal settings.

Program: FT991A Rig Control

Version: Version 1c

Platform: Windows 10 / 11

Includes: Program + Setup Guide + Tips

⬇ Download Version 1c ZIP

FT991A_Install_Files+Instructions.zip