sanmotion rs2a03a0al0w00

Good morning, I recovered two years ago some of these drives: sanmotion r rs2a03a0al0w00. I tried to communicate with its R-Setup software and they connected to the PC without any problems even if they gave an encoder error because it was not connected (I don't have motors). A few days ago I tried to reconnect the PC but they don't want to communicate... and yet I set the group parameter to 20 on 01 which is the unit number and 21 to 05 which corresponds to 38,400 I used a PC with native serial, Windows 7, set the serial buffers to a minimum as explained in an article on connecting these drives. If anyone can help me, I thank you in advance. Greetings Mauro

the strange thing is that they are the usual PCs and software that worked a year ago... then my brother had a serious health problem I gave up everything, now everything is better I wanted to look for some motors to use them and I am no longer able to connect them to the PC. I ordered a cable with the right plug when it arrives I will try again. last year I had soldered the GND RXD TXD wires and screen only on the servo side and it worked perfectly.
thanks Tom

Hi Tom, with the new cable all four work. I looked for motors but they ask 200 euros, in your opinion are these drives valid or are new Chinese ones better?
I calculate the cost of the motors because the drives didn't cost me anything.

Yes the encoder must be serial, I found these motors for €190 each, I will try to lower the price they are 400 watt battery-powered absolute encoder 131072 pulse... I tried to set it in the drive and it is in the list.