Introduction

The idea comes from Pedro ON7WP who was trying to use an older Icom transceiver for remote control with Icom's RS-BA1 software. The Icom IC275 is a VHF allmode rig, but lacks TX/RX switching via the CI-V commands. However, RS-BA1 sends the TX command regardless the transceiver. It uses the 0x00 addres (all transceivers) to send the TX commando.

Pedro's Github : https://github.com/on7wp/ICOM-CI-V-Arduino-Monitor

String in detail

I just monitor the data sent from the host (computer) :

TX = FE FE 00 E0 1C 00 01 FD
RX = FE FE 00 E0 1C 00 00 FD

Serial library

One of my goals was to eliminate the use of an older RS232 port. The CI-V port is 5V TTL compatible. You can build the level converter with the famous MAX232 and a USB <> RS232 adaptor. But the Arduino has already the hardware. By creating a second serial port in code you can eliminate both MAX232 and USB adaptor.

But I ran into problems when I tried to echo both devices to each other. Apparantly the standard Software Serial library is interrupt driven or something like that. I think i got timing issues. I used AltSoftSerial to have a working software serial port with better timing.

Attention : Read the site, the ports this library uses are locked on D8 (rxd) and D9 (txd) for the Arduino Nano.

Interface

Other uses

This code is also tested with HRD v5.24.0.36 and my Icom IC756. Remote control works as normal. TX is not available (blame HRD :-)). Omnirig, hmm, I made a custom ini file, seems to work with the client programm, but fails in real use (JS8call for example).

Resources

More details can be found :

ON3JT/Arduino-CI-V

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