Command Quick Reference

This page provides a quick reference for all 66 RS-UV3A serial commands. Click on a command to see detailed documentation.

Command Syntax

• Commands are not case sensitive (fs = FS)
• Commands end with carriage return (CR, ASCII 13)
• Numeric parameters require all digits (e.g., FS146520 not FS14652)
• Query current value with ? suffix (e.g., F?, SQ?)
• Default baud rate is 19200

Serial Port Warning

The DE-9 connector uses TTL levels (3.3V/5V), NOT RS-232 voltages. Do not connect to a standard RS-232 port.

Quick Reference Table

Command	Description	Category
F	Set TX/RX frequency	Frequency
FM	Measure signal level	Frequency
VU	Set volume (0–39)	Audio
AF	Audio low-pass filter	Audio
HP	Audio high-pass filter	Audio
GM	Microphone gain	Audio
GT	CW/DTMF tone gain	Audio
DP	Pre/de-emphasis	Audio
SQ	Squelch level (0–9)	Squelch & Tones
SR	Squelch range	Squelch & Tones
SO	Squelch status	Squelch & Tones
TF	CTCSS tone frequency	Squelch & Tones
TM	CTCSS mode	Squelch & Tones
TS	Tone squelch sensitivity	Squelch & Tones
DD	DTMF tone duration	DTMF & CW
DR	DTMF detector on/off	DTMF & CW
DS	Send DTMF string	DTMF & CW
CT	Send MCW (audio CW)	DTMF & CW
CW	Send true CW	DTMF & CW
CF	CW audio frequency	DTMF & CW
CS	CW speed (WPM)	DTMF & CW
CL	Set callsign	DTMF & CW
SD	CW/DTMF sidetone	DTMF & CW
BC	True CW beacon timer	Beacon
BT	MCW beacon timer	Beacon
BM	Beacon message	Beacon
MC	Multi-channel beacons	Beacon
IT	CW ID timer	Beacon
ID	Send CW ID	Beacon
RC	Recall memory channel	Memory
ST	Store memory channel	Memory
CP	Report channel parameters	Memory
CC	Check channel squelch	Memory
FD1	Restore factory defaults	Memory
AI	Arduino input pin function	I/O Control
AO	Arduino output pin function	I/O Control
EX	External pin function	I/O Control
LD	Status LED function	I/O Control
TX	Transmit on/off	System
PW	TX power level	System
TO	Timeout timer	System
TG	Timeout message	System
HT	TX hang time	System
CO	COR inhibit time	System
CB	Courtesy beep	System
VX	VOX on/off	System
VL	VOX sensitivity	System
BW	Channel bandwidth	System
PD	Transceiver chip power	System
B1	Serial port 1 baud rate	System
B2	Serial port 2 baud rate	System
FW	Firmware version	System
BL	Enter bootloader	System
SS	Signal strength	System
SN	Noise level	System
VT	Operating voltage	System
TP	PCB temperature	System
BS	Battery status (legacy)	System
RR	Read chip register	System
RS	Set chip register	System

Command Categories

• Frequency — Setting and measuring frequencies
• Audio — Volume, filters, and gain controls
• Squelch & Tones — RSSI squelch and CTCSS
• DTMF & CW — Tone signaling and Morse code
• Beacon — Automatic beacon operation
• Memory — Channel storage and recall
• I/O Control — Arduino and external pin functions
• System — Power, status, and configuration