Max IEC Gateway
Modbus TCP/RTU to IEC 60870-5-104/101 gateway with web dashboard
...Map registers to IEC points in a web dashboard: single and double points (also from register bits), measured values, step positions, bitstrings and energy counters, with any byte order, scaling, deadbands and time tags. 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