APC Smart-UPS On-Line (SURTD)

Installation

1. 1Install the APC Network Management Card AP9631 into the management slot of the SURTD-series UPS and connect it to the local network with an Ethernet cable.
2. 2Assign a static IP address to the AP9631 card and enable Modbus TCP via the card's web interface or CLI, noting the TCP port (default 502).
3. 3Connect your ModbusCloud gateway (MCG or MLP series) to the same network as the AP9631 card and ensure it can reach the card's IP address.
4. 4Import the APC Smart-UPS On-Line SURTD template from the ModbusCloud template library into your project.
5. 5Configure the template connection settings with the AP9631 IP address and Modbus TCP port, then verify that readings appear on the dashboard.
6. 6Confirm that the Remaining Run Time value at address 128 is read correctly as a uint32 (two registers) and not as two separate 16-bit values.

Things to watch for

01

I see zero or incorrect values for Remaining Run Time. What is wrong?

The Remaining Run Time register at address 128 is a uint32 value that spans two consecutive 16-bit registers. Make sure your gateway is configured to read this as a single 32-bit unsigned integer rather than two separate registers.

02

The gateway cannot connect to the UPS over Modbus TCP. What should I check?

Verify that the AP9631 Network Management Card is installed and has Modbus TCP enabled. Check that the card has a valid IP address, that the gateway is on the same subnet or has a route to it, and that TCP port 502 (or your configured port) is not blocked by a firewall.

03

Do I need a specific firmware version on the AP9631 card?

Modbus TCP support requires a firmware version on the AP9631 that includes the Modbus TCP agent. Check the APC support site for the latest firmware and ensure the Modbus feature is listed as supported.

04

Can I also send commands or control the UPS with this template?

No. This template is read-only and does not include any write or control registers. It is designed solely for monitoring UPS status and electrical parameters.

Registers (10)

10 read / 0 write

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