Protocol analyzer -- Wireshark

installation

https://github.com/afenkart/wireshark

usage:
git checkout -b digitalStrom origin/digitalStrom
prb. autoreconf / configure / make
./wireshark-gtk

use filter use ds485

capture on target

tcpdump -i lo port 8442 -w ds485d.pcap

then copy and open the resulting log file on your host