This optoisolated interface project ensures a highly stable, noise-free connection that protects your valuable transceiver while unlocking full automation capabilities for your ham radio shack. If you are ready to construct this circuit, let me know: What you are using?
: A USB Type-B or Micro-USB jack connects to the host computer. USB-to-Serial Chip : The (or similar chips like the
If you have decided to build your own interface, following a set of methodical steps will save you hours of debugging. icom ci v usb interface schematic top
Here, you will not just find a single schematic to copy, but a thorough analysis of the logic, pinouts, and design philosophies behind different interface schematics. This knowledge will help you choose the right design, customize it to your needs, and successfully build it.
Manhattan-style (or "dead bug") construction is excellent for prototyping, as suggested by KA6WKE . This optoisolated interface project ensures a highly stable,
Once your hardware is built, you need to configure your software.
For the vast majority of Icom radios with a 3.5mm jack, the pinout is standardized. However, it is always a good idea to consult your radio’s service manual for confirmation. The table below summarizes the standard interface: USB-to-Serial Chip : The (or similar chips like
On the isolated PC side, the phototransistor conducts, pulling the USB chip’s RXD pin low. A 10kΩ pull-up resistor connected to the USB's 5V line keeps RXD high when the bus is idle. 3. Combining TX and RX into a Single Wire
Acts as an open-drain/open-collector drive, pulling the data line down to 0V when transmitting, and releasing it high (via a pull-up resistor) when idle. Pull-up Resistor: A resistor connected to
This is the heart of the interface. Its job is to merge the TX and RX paths onto a single bidirectional line. A robust and common design for this is based on an open-collector bus driver.
The CI-V port is a 3.5mm mono jack that acts as a bidirectional, open-collector bus. TTL (0V to 5V or 3.3V). Wiring: Tip is Data, Sleeve is Ground.