Troubleshooting: SEMS Not Reachable

Diagnostic flow

1. Power — confirm the board is powered.
2. Ethernet link — confirm the physical link is up.
3. Addressing — verify DHCP/static expectations.
4. IP discovery — identify the actual controller address.
5. Subnet — confirm the laptop is in the same network path.
6. Reachability — test local network reachability.
7. Browser access — retry the SEMS web interface.

If DHCP is expected

• inspect the router lease table;
• confirm the controller is connected to the intended LAN;
• confirm the site switch/router is live.

If static addressing is expected

• verify the intended static IP plan;
• verify there is no duplicate IP conflict;
• make sure the laptop uses a compatible local subnet during commissioning.

If the IP is still unknown

• connect at the closest practical local network point;
• review installation notes and board labeling;
• escalate to the approved field support path rather than guessing hidden defaults.