Warning: At the bottom of page 35 of early APRS manuals is a diagram of the data socket on the radio. If you already have a FTDI based USB/serial adapter then this is a cheap and easy way to get connected. No level conversion circuit is required - this is a simple wire-to-wire cable connection. Note that the diagram shows the connecting pins of the connectors, not the cable ends. In the back of the APRS manual on page 35 there is a CT-142 cable diagram showing the pinout of the 8-pin mini-din on the radio and a 9-pin d-sub serial connector to the computer's serial port or a USB/serial adapter.
Here is a snapshot of receiving data from the FTM-350 - note that the polarity is Plus and Minus: The radio uses standard RS232 serial communications NOT TTL as do many other Yaesu radios. If anyone finds another make of USB chip that works then please contact the author to get this section updated. The ONLY USB/serial adapters the author has found that work are those using FTDI USB chips. Other makes of USB chip may also have problems. During beta testing it was found that USB/serial adapters which are based on the Prolific chip do NOT work at that speed. The built-in serial port of the author's PC will NOT operate at that speed. The radio uses an unusual cloning baud rate of 48000 baud. For programming the radio these cables must use a USB/serial converter that contains an FTDI USB chip Prolific USB chips do not work at the non-standard cloning baud rate of 48000 baud. There is also the CT-140 which has an extra lead for connecting a TNC. The Yaesu data cable is the CT-142 which has an 8-pin mini-din at one end to connect to the radio and a 9-pin DB9 at the PC end. The Links page of the website lists sources of ready-made cables that can be ordered over the Internet. The radio is connected to the computer using a programming cable.
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