DNP3SimX - Outstation Master

DNP3 SimX is a native iOS master (controlling station) simulator and test client for the DNP3 (IEEE 1815) protocol used in SCADA, substation, and utility telecontrol systems. Connect to any DNP3 outstation or RTU over TCP, run integrity and event polls, issue control-relay and analog-output commands, and watch live point data — all from your iPhone. Built for commissioning engineers, integrators, and technicians who need a quick, reliable DNP3 master in the field without hauling a laptop. FEATURES • Full link-layer handling — RESET_LINK, link-status keep-alive, and both confirmed and unconfirmed data transfer, with correct DNP3 CRC-16 framing on every frame. • Integrity and event polling (Class 0/1/2/3), with returned points shown in a live table (binary/analog inputs, counters, with quality flags and timestamps). • Control-relay output (CROB) and analog-output commands, with Select-Before-Operate (SBO) or Direct Operate, single-point (latch/pulse) and paired double-point (Trip/Close) control, and command status decoded and shown in the activity log. • Clock synchronization, cold/warm restart, delay measurement, and enable/disable unsolicited responses. • Live monitor point table: group/variation/index, value, quality, and timestamp per point. • Timestamped frame console for every frame in and out, with hex view for debugging the wire protocol. • Listen mode: a passive tap that decodes a live DNP3 session on the wire without acting as master — useful for observing traffic between an existing master and outstation. • Configurable parameters: master/outstation address, timers, poll intervals — defaulting to standard DNP3 values. DESIGNED FOR • Substation and SCADA commissioning • RTU and gateway integration testing • Protocol learning and troubleshooting PRIVACY DNP3 SimX collects no data. It has no accounts, no analytics, and no ads. It connects only to the devices you configure, and all settings stay on your device. This is a one-time paid app with no in-app purchases or subscriptions.