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IC746.cpp 100644
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IC746 CAT Library, by KK4DAS, Dean Souleles
Inspired by: ft857d CAT Library, by Pavel Milanes, CO7WT,
Emulates an ICOM 746 CAT functionality to work with all ham radio software that include CAT control
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <>.
#include "Arduino.h"
#include "IC746.h"
//#define DEBUG_CAT
#ifdef DEBUG_CAT
#include <SoftwareSerial.h>
SoftwareSerial catDebug(6, 7); // RX, TX
String dbg;
// User supplied calback function work variables, must be static
static FuncPtrBoolean catSplit;
static FuncPtrBoolean catSetPtt;
static FuncPtrVoidBoolean catGetPtt;
static FuncPtrVoidLong catGetFreq;
static FuncPtrLong catSetFreq;
static FuncPtrVoidByte catGetMode;
static FuncPtrByte catSetMode;
static FuncPtrVoidByte catGetSmeter;
static FuncPtrByte catSetVFO;
static FuncPtrVoid catAtoB;
static FuncPtrVoid catSwapVfo;
// Command indices
// Command structure after preamble and EOM have been discarded
// |56|E0|cmd|sub-cmd|data
// 56 - fixed transceiver address for IC746
// E0 - fixed cat xontroller address
// The sub-command field varies by command. For somme commands the sub-cmd field is not supplied and the data
// begins immediatedly follwing the command.
// The following are the array indedes within the command buffer for command elements that are sent with the command
// or are where we put data to return to the conroller
#define CAT_IX_XCVR_ADDR 0
#define CAT_IX_CTRL_ADDR 1
#define CAT_IX_CMD 2
#define CAT_IX_SUB_CMD 3
#define CAT_IX_FREQ 3 // Set Freq has no sub-command
#define CAT_IX_MODE 3 // Get mode has no sub-command
#define CAT_IX_PTT 4 // PTT RX/TX indicator
#define CAT_IX_IF_FILTER 4 // IF Filter value
#define CAT_IX_SMETER 4 // S Meter 0-255
#define CAT_IX_SQUELCH 4 // Squelch 0=close, 1= open
#define CAT_IX_ID 5
#define CAT_IX_DATA 4 // Data following sub-comand
Contructor, simple constructor, it initiates the serial port in the
default mode for the radio: 9600 @ 8N2
void IC746::begin() {
Serial.begin(9600, SERIAL_8N2);
#ifdef DEBUG_CAT
dbg = "CAT Debug Ready:";
// Alternative initializer with a custom baudrate and mode
void IC746::begin(long br, int mode) {
Allowed Arduino modes for the serial:
Serial.begin(br, mode);
#ifdef DEBUG_CAT
dbg = "CAT Debug Ready";
Linking user supplied callback functions
// PTT
void IC746::addCATPtt(void (*userFunc)(boolean)) {
catSetPtt = userFunc;
// Split
void IC746::addCATsplit(void (*userFunc)(boolean)) {
catSplit = userFunc;
// VFO A=B - set both VFOs to be the same as the active VFO
void IC746::addCATAtoB(void (*userFunc)(void)) {
catAtoB = userFunc;
// Swap Active VFO
void IC746::addCATSwapVfo(void (*userFunc)(void)) {
catSwapVfo = userFunc;
// Get the freq of operation, the function must return the freq
void IC746::addCATGetFreq(long (*userFunc)(void)) {
catGetFreq = userFunc;
// Get the mode of operation, the function must return the mode
void IC746::addCATGetMode(byte (*userFunc)(void)) {
catGetMode = userFunc;
// GetPTT - function must return true for Tx and false for Rx
void IC746::addCATGetPtt(boolean (*userFunc)(void)) {
catGetPtt = userFunc;
// S meter (user function must return 0-15)
void IC746::addCATSMeter(byte (*userFunc)(void)) {
catGetSmeter = userFunc;
// Set Frequency - user function must accept a long as the freq in hz
void IC746::addCATFSet(void (*userFunc)(long)) {
catSetFreq = userFunc;
// Set Mode - user function must interpret MODE per the constants in IC746.h
void IC746::addCATMSet(void (*userFunc)(byte)) {
catSetMode = userFunc;
// SEt VFOA or B - user function must interpret VFO per the constants in IC746.h
void IC746::addCATVSet(void (*userFunc)(byte)) {
catSetVFO = userFunc;
// Protocol Message Handling
// Send a message back to CAT controller
void IC746::send(byte *buf, int len) {
int i;
for (i = 0; i < len; i++) {
// sendAck() - send back hard-code acknowledge message
void IC746::sendAck() {
send(ack, 3);
// sendNack() - send back hard-code negative-acknowledge message
void IC746::sendNack() {
send(nack, 3);
readCMD - state machine to receive a command from the controller
CAT_RCV_WAITING - scan incoming serial data for first preamble byte
CAT_RCV_INIT - second premable byte confirms start of message
CAT_RCV_RECEIVING - fill command buffer until EOM received
Command format
FE FE = preamble, FD = end of command
56 = transceiver default address for IC746 (unused)
E0 = CAT controller default address (unused)
Upon successful receipt of EOM, protocol requires echo back of enitre message
On interrupted preamble or buffer overflow (no EOM received), send NAK
On successful receipt of a command the global array cmdBuf
will have the received CAT command (without the preamble and EOM)
boolean IC746::readCmd() {
byte bt;
boolean cmdRcvd = false;
while (Serial.available() && !cmdRcvd) {
bt = byte(;
switch (rcvState) {
case CAT_RCV_WAITING: // scan for start of new command
if (bt == CAT_PREAMBLE) {
rcvState = CAT_RCV_INIT;
case CAT_RCV_INIT: // check for second preamble byte
if (bt == CAT_PREAMBLE) {
} else { // error - should not happen, reset and report
bytesRcvd = 0;
switch (bt) {
case CAT_EOM: // end of message received, return for processing, reset state
send(cmdBuf, bytesRcvd); // echo received packet for protocol
cmdRcvd = true;
cmdLength = bytesRcvd;
bytesRcvd = 0;
default: // fill command buffer
if (bytesRcvd <= CAT_CMD_BUF_LENGTH) {
cmdBuf[bytesRcvd] = bt;
} else { // overflow - should not happen reset for new comand
bytesRcvd = 0;
sendNack(); // report error
return cmdRcvd;
// doSmeter() - process the CAT_READ_SMETER Command
// This command has two sub-commands, SMETER and SQUELCH, only SMETER is fully implemented
// The SMETER sub command requests the current Return S-meter readingscaled for IC 746 appropriate values
// It calls a user function returns 0-15 S0-9, +10, +20, +30, +40, +50 +60
// The mapping of s-units to IC746 equivalents done imperically using the CatBkt cat test program
// The second sub-command, SQUELCH request wheterh Squelch is open or closed. Return a fixed value
// of "Open" to keep the protocol happly
void IC746::doSmeter() {
switch (cmdBuf[CAT_IX_SUB_CMD]) {
if (catGetSmeter) {
const byte smap[] = {0, 20, 50, 70, 90, 110, 140, 150, 170, 180, 197, 201, 211, 216, 220, 230};
byte s;
s = catGetSmeter();
cmdBuf[CAT_IX_SMETER] = smap[s];
dbg = "doSmeter- s: ";
dbg += String(s);
dbg += " map: ";
dbg += String(smap[s]);
} else {
cmdBuf[CAT_IX_SMETER] = 0;
send(cmdBuf, 5);
case CAT_READ_SUB_SQL: // Squelch condition 0=closed, 1=open
cmdBuf[CAT_IX_SQUELCH] = 1;
send(cmdBuf, 5);
BCD Version
void IC746::doSmeter() {
switch (cmdBuf[CAT_IX_SUB_CMD]) {
if (catGetSmeter) {
const byte smap[] = {0, 20, 50, 70, 90, 110, 140, 150, 170, 180, 197, 201, 211, 216, 220, 230};
byte s = catGetSmeter();
dbg = "doSmeter- s:";
dbg += String(s);
dbg += " map: ";
dbg += String(smap[s]);
dbg += " BCD: ";
for (int i = CAT_IX_SMETER; i < CAT_IX_SMETER+2; i++) {
dbg += String(cmdBuf[i], HEX);
dbg += " ";
} else {
cmdBuf[CAT_IX_SMETER] = 0; // user has not supplied S Meter function - keep the protocol happy
cmdBuf[CAT_IX_SMETER + 1] = 0;
send(cmdBuf, 6);
case CAT_READ_SUB_SQL: // Squelch condition 0=closed, 1=open
cmdBuf[CAT_IX_SQUELCH] = 1;
send(cmdBuf, 5);
// doPtt() - process the CAT_PTT Command
// CAT_PTT calls the user supplied functions to either put the rig in to Tx or Rx or to request the rigs
// current Tx/Rx state
// A "read ptt" request does not have a data byte and is therefore one byte shorter
// than a "set ptt" request.
// 56 | E0 | 1C | 00 - Read request 1C is PTT command, sub-command 0 is uused, no data byte
// 56 | E0 | 1C | 00 | 01 - Set Tx, trailing data bit 1 for Tx, 0 for Rx
void IC746::doPtt() {
if (cmdLength == 4) { // Read request
if (catGetPtt) {
cmdBuf[CAT_IX_PTT] = catGetPtt();
send(cmdBuf, 5);
} else { // Set request
if (catSetPtt) {
if (cmdBuf[CAT_IX_PTT] == CAT_PTT_TX) {
} else {
sendAck(); // always acknowledge "set" commands
// doSplit() - process the CAT_SPLIT Command
// Call user supplied function to turn split on or off
void IC746::doSplit() {
switch (cmdBuf[CAT_IX_SUB_CMD]) {
if (catSplit) {
if (catSplit) {
// doSetVfo() - process the CAT_SET_VFO Command, calls user supplied functions
// SET_VFO with no sub-command selects VFO Tuning vice Memory Tuning (memory tuning is not implemented)
// SET_VFO has four sub-commands:
// VFOA or VFOB - directs the rig to make the selected VFO the active VFO
// VFO_A_TO_B - directs the rig to copy the make both VFO frequencies the same as the Active VFO
// VFO_SWAP - directs the rig to exchange VFOA and VFOB
void IC746::doSetVfo() {
if (cmdLength == 4) { // No sub-command - sets VFO Tuning vice memory tuning
sendAck(); // Memory tuning is not implemented so send ack to keep protocol happy
switch (cmdBuf[CAT_IX_SUB_CMD]) {
case CAT_VFO_A:
case CAT_VFO_B:
if (catSetVFO) {
case CAT_VFO_A_TO_B:
if (catAtoB) {
if (catSwapVfo) {
// doSetFreq() - proces CAT_SET_FREQ command
// Call the user supplied function to set the righ frequency
void IC746::doSetFreq() {
if (catSetFreq) {
catSetFreq(BCDtoFreq()); // Convert the frequency BCD to Long and call the user function
// doReadFreq() - process the CAT_READ_FREQ command
// Call the user supplied function to read set the rig frequency
// Frequecies are sent and received in BCD - call the support functions to do the conversion
void IC746::doReadFreq() {
if (catGetFreq) {
FreqtoBCD(catGetFreq()); // get the frequency, convert to BCD and stuff it in the response buffer
send(cmdBuf, 8);
// doSetMode() - process the CAT_SET_MODE command
// Call the user function to put the rig into the requested mode. Only USB or LSB are supported.
void IC746::doSetMode() {
if (catSetMode) {
switch (cmdBuf[CAT_IX_SUB_CMD]) {
// doReadMode() - process the CAT_READ_MODE command
// Call the user function to query the rig's current mode
void IC746::doReadMode() {
if (catGetMode) {
cmdBuf[CAT_IX_MODE] = catGetMode();
send(cmdBuf, 4);
// doMisc() - process the CAT_MISC command
// The MISC command has several unrelated sub-commands
// The only one implemented here is the sub-command to read the IF Filter Setting
// The code sends a hard-coded response since most homebrew rigs won't have such a setting
// but programs like WSJTX and FLDIGI request it
// The value of 29 was determined by reviewing the IC-7600 CI-V documentation is more complete than the IC-746 doc.
// The value of 29 equates to 2.5KHz which should be a reasonable value.
// Commands that "set" values are replied to with an ACK message
void IC746::doMisc() {
switch (cmdBuf[CAT_IX_SUB_CMD]) {
// cmdBuf[CAT_IX_IF_FILTER] = 29; // Return a valid value - 29 represents 2.5K filter for SSB
cmdBuf[CAT_IX_IF_FILTER] = 0;
send(cmdBuf, 5);
// Not implemented
// Reply with ACK to keep the protocol happy
// doUnimplemented() - reasonable processing for features that are not fully implemented
// Unimplimented command handling
// These following commands are used to both set and read various parameters in the IC-746 that are not
// typically implemented in a homebrew transceiver.
// Commands requesting the state of various parameters require a data byte returned.
// We return zero in all cases which typically means the requsted feature is OFF - eg AGC, NB, VOX, etc.
// Command that "set" various parameters only require an ACK reply
// A "read" request has no data byte and is one byte shorter than a set request
void IC746::doUnimplemented() {
if (cmdLength == 4) { // Read request
cmdBuf[CAT_IX_PTT] = 0; // return 0 for all read requests
send(cmdBuf, 5);
} else { // Set parameter request
sendAck(); // Send an acknowledgement to keep the protocol happy
// check() - process commands from CAT controller, should be called from the sketch main loop
void IC746::check() {
// do nothing if it was disabled by software
if (!enabled) return;
// Receive a CAT Command
if (!readCmd()) return;
dbg = "rcvd: ";
dbg += String(cmdLength);
dbg += ": ";
for (int i = 0; i < cmdLength; i++) {
dbg += String(cmdBuf[i], HEX);
dbg += " ";
// Process the command - command opcode is at CAT_IX_CMD location in command buffer
switch (cmdBuf[CAT_IX_CMD]) {
case CAT_PTT:
case CAT_MISC:
cmdBuf[CAT_IX_ID] = CAT_RIG_ADDR; // Send back the transmitter ID
send(cmdBuf, 5);
// Unimplemented commands that request data from the rig - keep the protocol happy
case CAT_ATT:
default: // For all other commands respond with an ACK
#ifdef DEBUG_CAT
dbg = "unimp cmd: ";
dbg += String(cmdBuf[CAT_IX_CMD], HEX);
// BCD FrequencyConversion Routines
// Convert BCD frequency to/from command buffer to/from long
// Format (beginning at first data byte in buffer is
// Byte 0 10Hz | 1Hz
// Byte 1 1KHz | 100Hz
// Byte 2 100KHz | 10KHz
// Byte 3 10MHz | 1MHz
// Example: 7,123,456 is encoded 56 | 34 | 12 | 07
long IC746::BCDtoFreq() {
long freq;
freq = cmdBuf[CAT_IX_FREQ] & 0xf; // lower 4 bits
freq += 10L * (cmdBuf[CAT_IX_FREQ] >> 4); // upper 4 bits
freq += 100L * (cmdBuf[CAT_IX_FREQ + 1] & 0xf);
freq += 1000L * (cmdBuf[CAT_IX_FREQ + 1] >> 4);
freq += 10000L * (cmdBuf[CAT_IX_FREQ + 2] & 0xf);
freq += 100000L * (cmdBuf[CAT_IX_FREQ + 2] >> 4);
freq += 1000000L * (cmdBuf[CAT_IX_FREQ + 3] & 0xf);
freq += 10000000L * (cmdBuf[CAT_IX_FREQ + 3] >> 4);
return freq;
void IC746::FreqtoBCD(long freq) {
byte ones, tens, hund, thou, ten_thou, hund_thou, mil, ten_mil;
ones = byte(freq % 10);
tens = byte((freq / 10L) % 10);
cmdBuf[CAT_IX_FREQ] = byte((tens << 4)) | ones;
hund = byte((freq / 100L) % 10);
thou = byte((freq / 1000L) % 10);
cmdBuf[CAT_IX_FREQ + 1] = byte((thou << 4)) | hund;
ten_thou = byte((freq / 10000L) % 10);
hund_thou = byte((freq / 100000L) % 10);
cmdBuf[CAT_IX_FREQ + 2] = byte((hund_thou << 4)) | ten_thou;
mil = byte((freq / 1000000L) % 10);
ten_mil = byte(freq / 10000000L);
cmdBuf[CAT_IX_FREQ + 3] = byte((ten_mil << 4)) | mil;
cmdBuf[CAT_IX_FREQ + 4] = 0; // fixed
void IC746::SmetertoBCD(byte s) {
byte ones, tens, hund;
ones = byte(s % 10);
tens = byte((s / byte(10)) % 10);
cmdBuf[CAT_IX_SMETER] = byte((tens << 4)) | ones;
hund = byte((s / byte(100)) % 10);
cmdBuf[CAT_IX_SMETER + 1] = hund;

IC746.h 100644
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IC746 CAT Library, by KK4DAS, Dean Souleles
Inspired by: FT857D CAT Library, by Pavel Milanes, CO7WT,
The goal of this lib is to emulate an ICOM 746 CAT functionality
to work with all ham radio software that include CAT control
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <>.
* **************************************************************************/
#ifndef IC746_h
#define IC746_h
#include "Arduino.h"
CAT Command definitions from IC746 Manual
// Protocol
#define CAT_PREAMBLE 0xFE // sent twice at start of command
#define CAT_EOM 0xFD // end of message
#define CAT_ACK 0xFB // OK
#define CAT_NACK 0xFA // No good
#define CAT_RIG_ADDR 0x56 // Rig ID for IC746
#define CAT_CTRL_ADDR 0xE0 // Controller ID
// Commands
#define CAT_SET_TCV_FREQ 0x00 // Not implemented
#define CAT_SET_TCV_MODE 0x01 // Not implemented
#define CAT_READ_BAND_EDGE 0x02 // Not implemented
#define CAT_READ_FREQ 0x03
#define CAT_READ_MODE 0x04
#define CAT_SET_FREQ 0x05
#define CAT_SET_MODE 0x06
#define CAT_SET_VFO 0x07
#define CAT_SEL_MEM 0x08 // Not implemented
#define CAT_WRITE_MEM 0x09 // Not implemented
#define CAT_MEM_TO_VFO 0x0A // Not implemented
#define CAT_CLEAR_MEM 0x0B // Not implemented
#define CAT_READ_OFFSET 0x0C // Not implemented
#define CAT_SET_OFFSET 0x0D // Not implemented
#define CAT_SCAN 0x0E // Not implemented
#define CAT_SPLIT 0x0F
#define CAT_SET_STEP 0x10 // Not implemented
#define CAT_ATT 0x11 // Not implemented
#define CAT_SEL_ANT 0x12 // Not implemented
#define CAT_SET_UT102 0x13 // Not implemented
#define CAT_SET_PARAMS1 0x14 // Not implemented
#define CAT_READ_SMETER 0x15 // Only impemented read S-Meter
#define CAT_SET_PARAMS2 0x16 // Not implemented (various settings)
#define CAT_READ_ID 0x19
#define CAT_MISC 0x1A // Only implemented sub-command 3 Read IF filter
#define CAT_SET_TONE 0x1B // Not implemented (VHF/UHF)
#define CAT_PTT 0x1C
CAT Sub COmmands
// Mode Subcommand
#define CAT_MODE_LSB 0x00
#define CAT_MODE_USB 0x01
#define CAT_MODE_AM 0x02 // Not implemented
#define CAT_MODE_CW 0x03 // Not implemented
#define CAT_MODE_RTTY 0x04 // Not implemented
#define CAT_MODE_FM 0x05 // Not implemented
#define CAT_MODE_CW_R 0x06 // Not implemented
#define CAT_MODE_RTTY_R 0x07 // Not implemented
// VFO Subcommand
#define CAT_VFO_A 0x00
#define CAT_VFO_B 0x01
#define CAT_VFO_A_TO_B 0xA0
#define CAT_VFO_SWAP 0xB0
// Split Subcommand
#define CAT_SPLIT_OFF 0x00
#define CAT_SPLIT_ON 0x01
#define CAT_SIMPLE_DUP 0x02 // Not implemented
#define CAT_MINUS_DUP 0x03 // Not implemented
#define CAT_PLUS_DUP 0x04 // Not implemented
// S-Meter / Squelch Subcommand
#define CAT_READ_SUB_SQL 0x01 // Not implemented (squelch)
#define CAT_READ_SUB_SMETER 0x02
// PTT Subcommand
#define CAT_PTT_RX 0x00
#define CAT_PTT_TX 0x01
// 1A - MISC Subcommands
#define CAT_SET_MEM_CHAN 0x00 // Not implemented
#define CAT_SET_BANDSTACK 0x01 // Not implemented
#define CAT_SET_MEM_KEYER 0x02 // Not implemented
#define CAT_READ_IF_FILTER 0x03 // Hard coded response to keep WSJTX and other CAT controllers happy
// Command Receive States
#define CAT_RCV_WAITING 0 // waiting for 1st preamble byte
#define CAT_RCV_INIT 1 // waiting for 2nd preamble byte
#define CAT_RCV_RECEIVING 2 // waiting for command bytes
// Command buffer (without preamble and EOM)
// |FE|FE|56|E0|cmd|sub-cmd|data|FD| // Preamble (FE) and EOM (FD) are discarded leaving
// 2 addr bytes , 1 command, 1 sub-command, up to 12 data, (longest is unimplemented edge frequency)
// defining the funtion type by params
typedef void (*FuncPtrVoid)(void);
typedef long (*FuncPtrVoidLong)(void);
typedef byte (*FuncPtrVoidByte)(void);
typedef void (*FuncPtrBoolean)(boolean);
typedef boolean (*FuncPtrVoidBoolean)(void);
typedef void (*FuncPtrByte)(byte);
typedef void (*FuncPtrLong)(long);
The class...
class IC746 {
// we have two kind of constructors here
void begin(); // default for the radio 9600 @ 8N2
void begin(long baudrate, int mode); // custom baudrate and mode
void check(); // periodic check for serial commands
// the functions that links the lib with user supplied functions
void addCATPtt(void (*)(boolean));
void addCATsplit(void (*)(boolean));
void addCATAtoB(void (*)(void));
void addCATSwapVfo(void (*)(void));
void addCATFSet(void (*)(long));
void addCATMSet(void (*)(byte));
void addCATVSet(void (*)(byte));
void addCATGetFreq(long (*)(void));
void addCATGetMode(byte (*)(void));
void addCATGetPtt(boolean (*)(void));
void addCATSMeter(byte (*)(void));
boolean enabled = true;
byte cmdBuf[CAT_CMD_BUF_LENGTH];
byte rcvState = CAT_RCV_WAITING;
boolean cmdRcvd = false;
int bytesRcvd = 0;
int cmdLength = 0;
long freq = 0;
void setFreq(void);
void sent(void);
void send(byte *, int);
void sendAck(void);
void sendNack(void);
boolean readCmd(void);
long BCDtoFreq(void);
void FreqtoBCD(long);
void SmetertoBCD(byte s);
void doSmeter();
void doPtt();
void doSplit();
void doSetVfo();
void doSetFreq();
void doReadFreq();
void doSetMode();
void doReadMode();
void doMisc();
void doUnimplemented();

INSTALL.txt 100644
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Put the "IC746CAT" folder in your Arduino "libraries" folder.

LICENSE.txt 100644
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Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
The GNU General Public License is a free, copyleft license for
software and other kinds of works.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors. You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
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To protect your rights, we need to prevent others from denying you
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For example, if you distribute copies of such a program, whether
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Developers that use the GNU GPL protect your rights with two steps:
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For the developers' and authors' protection, the GPL clearly explains
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The precise terms and conditions for copying, distribution and
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"This License" refers to version 3 of the GNU General Public License.
"Copyright" also means copyright-like laws that apply to other kinds of
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@ -1,2 +1,102 @@
# IC746CAT
ICOM IC-746 Computer Aided Transceiver (CAT( control emulation for Android
# ICOM IC-746 CAT control emulation for Arduino #
This library give support to any sketch to act as an ICOM IC-746 radio once you configure it correctly.
Documentation for the ICOM IC-746 may be found here:
The following functions are implemented
* VFO A/B Selection
* VFO Swap
* VFO Set A=B
* Split (On/Off)
* Frequency GET/SET
* Mode GET/SET (USB, LSB only)
* S-meter level GET
All other functions are coded to give correct reasoable responses to other CAT commands.
I have found this set of functions to be all that is required for the majorit of logging programs and digital modes such as the WSJTX suite and FLDIGI.
## Supported software ##
So far we have tested support for the following CAT capable software:
* Hamlib
* Fldigi (using Hamlib)
* CatBKT
* Ham Radio Deluxe
If you use find this library does not work with any particular CAT enabled software please let me know via the "Issues" tab on Github.
## Tips for developers: ##
The library implements the IC-746 version of ICOM's CI-V protocol. I chose the IC-746 as the target as it is the first in the ICOM linde to implement all of what is needed to run digital modes easily and doesn't have too many extra features to code around.
The CI-V protocol is reasonably well documented but I have made some some assumptions about appropriate responses. I referred to the IC-7600 CIV referece manual which has much additional detail. I did not have an IC-746 available for comparison, but I tested with the Hamlib rigctl program and all functions work without error. I also have tested with WSJTX, FLDIGI and Ham Radio Deluxe. I found the program CatBkt to be especially helpful as it exposes many controls that are not used in other programs.
The library is coded to give reasonable responsed to 100% of the IC-746 cat protocol commands whether or not the feature is actually implemented.
## Inspiration ##
This library has was inspired by the work of Pavel Milanes, C07WT on his Yaes FT-857D library
## Installation ##
Copy the IC746CAT folder to the Arduino libraries folder.
## Usage ##
The libary uses the the hardware serial port "Serial" to communcate with the CAT controller softaware. The default paramters are baud 19200, N81, the same as the IC-746.
To use the library you must code a few custom call back functions and register them with the library. Your callbacks will require specific parameters and return values based on the particular command. Your functions will be called by the CAT libary upon receipt of the relevant CAT commands. Your functions need to take whatever actions are necessary to implement the command and where requested, return the appropriate value to the library for transmission back to the CAT controller.
Here is a code sample:
in your sketch:
#include <IC746.h>
IC746 radio = IC746();
long frequency = 7200000;
byte activVFO = CAT_VFO_A;
long catGetFreq() {
return frequency;
void catSetVFO(byte vfo) {
if (vfo == CAT_VFO_A) {
activeVFO = CAT_VFO_A;
} else {
activeVFO = CAT_VFO_B;
In your setup() function register your callbacks and start the interface:
In your main loop call the check() function:
See the example sketch for more examples.
A word on the example sketch. It is configured to write debug output to a ILI9341 TFT using the Adafruit libraries, because that is what I had on the bench. It should be straightforward to modify it to use SoftwareSerial or other output device of your choice.
## Author & contributors ##
The only author is Dean Souleles, KK4DAS, reachable at
## Where to download the latest version? ##
Always download the latest version from the [github repository](

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@ -0,0 +1,312 @@
#include "IC746.h"