This post reviews a hardware-software configuration for digital operation, e.g., PSK or RTTY, under the FLEX-6500 Transceiver (Signature Series). There are several other possible arrangements. This may need adaptation to your own hardware-software setup. Hope this will help!
My hardware configuration consists of a FLEX-6500, RIGblaster duo and a laptop. The software configuration is SmartSDR version 0.16.4 and accompanying SmartSDR CAT; HamRadioDeluxe version 5.0 and accompanying Digital Master 780.
SmartSDR CAT is configured such that virtual serial port COM4 is used to control the FLEX-6500.
The HamRadioDeluxe connection to the FLEX-6500 must go through the virtual serial port COM4.
This connection is used to read and set the frequency from HamRadioDeluxe.
On the Digital Master 780 side, the input must be taken from the Headset Mic and the output must go to Speakers and Headphones.
The PTT is activated through the RIGblaster duo. Virtual serial port COM9 is used for that on my system.
Several hardware connections must be made using cables
Laptop-to-RIGblaster duo Connections
Using a USB cable, the RIGblaster-USB jack is connected to a laptop-USB jack. This is used to activate the PTT of the FLEX-6500 through the RIGblaster duo.
Using a cable (3.5mm stereo), the laptop-line out (Headset) is connected to the RIGblaster duo-PC IN. This is for sending the audio output of the laptop, i.e., the audio modulating signal corresponding to the digital mode, to the RIGblaster duo.
Using a cable (3.5mm stereo), the RIGblaster duo RCV OUT is connected to the laptop-LINE IN jack. This sends the audio signal from the RIGblaster duo to the laptop for demodulation.
On SmartSDR, all compression and equalization must be disabled.
FLEX-6500-to-RIGblaster duo Connections
Using a cable (3.5mm stereo), the FLEX-6500 PWR SPKR output (in the back of the radio) is connected to the RIGblaster duo-RADIO IN A jack. This sends the audio output from the radio to the RIG blaster duo.
Using a microphone cable, the RIGblaster duo MIC OUT A output is connected to the MIC jack of the FLEX-6500 (wiring is compatible with the Yaesu FT-847). This sends the audio output from the RIGblaster duo to the FLEX-6500. The RIG blaster duo also uses that cable to activate the PTT of the FLEX-6500.
This setup works equally well with Fldigi 3.12.74.