Max IEC Gateway
Modbus TCP/RTU to IEC 60870-5-104/101 gateway with web dashboard
...SCADA commands are written back to Modbus with select-before-operate and a configurable select timeout.
Every change applies live, without a restart. Includes 9 device templates, CSV import/export, a traffic monitor, trends, IP allow-list and password-protected dashboard. Runs as a Windows service or Linux systemd service.
Free 30-day trial, then $150 one-time for a lifetime license (1 computer) with free updates: https://iec.maxenergic.com