Schematic usb to serial

The circuit presented here offers a solution to this. As you can see from the schematic, this is a very simple circuit, built around a cheap, standard AVR microcontroller plus a handful of passive components. You may have already observed that this microcontroller does not have a USB interface and the circuit does not use a USB to serial converter either.

The strength of this circuit is found in the firmware. The circuit is easily built on a small piece of prototyping board or even on a breadboard, since the controller is available in a DIP package. If you are going to program the controller yourself via connector K2 then make sure that you set the configuration fuses so that the internal oscillator uses the external crystal as the clock source.

Jumper K3 is provided in the event you would like to power the circuit to be programmed from the USB port. PTH components could be used instead. All wiring was performed using solderable enamelled copper wire. A 9-pin D connector was used to connect to a variety of rigs, using specific cables for each one. Pin 4 PTT. Pin 5 GND.

USB Serial Interface. It is used by a software application to send remote-control commands to the rig. Digital Modes such as FT8 and dozens of others where the software controls the radio frequency and mode and PTT Satellite tracking where the software controls the radio Doppler frequency correction Logging software with automatic frequency and mode recording.

All you have to do is to buy a suitable device and wire up the cable with a connector to suit the remote control port on your rig. However there are some important caveats:. Some rigs support RS levels for remote control. Some will work with both.

However, the logic sense for TTL , mark-space is inverted. It is important to determine which technology and voltage levels is used by your rig.

The only option is to consult the manual, schematic or to use a multimeter on the rigs TXD line to check. Most RS devices will have a DB-9 connector. Notoriously, there are cables using counterfeit Prolific PL chips on the market. These are typically much cheaper than the ones using genuine chips. Avoid these cable as they may not work. Interconnecting wire routes may be shown approximately, where particular receptacles or fixtures must be on a common circuit.

Wiring diagrams use pleasing symbols for wiring devices, usually alternating from those used on schematic diagrams.

The electrical symbols not by yourself enactment where something is to be installed, but with what type of device is brute installed. For example, a surface ceiling vivacious is shown by one symbol, a recessed ceiling well-ventilated has a different symbol, and a surface fluorescent vivacious has complementary symbol.

Each type of switch has a every second metaphor and thus accomplish the various outlets.