APC Smart-UPS SMT

Installation

1. 1Connect a Modbus RTU cable from the APC SMT front panel port to the ModbusCloud gateway RS485 channel. Refer to APC wiring documentation for the correct pinout.
2. 2Enable Modbus RTU in the APC front panel menu, set address 1, baudrate 9600.
3. 3In ModbusCloud, add a Modbus RTU device matching those settings and import the APC Smart-UPS SMT template.
4. 4Verify battery voltage and remaining runtime show plausible values.

Things to watch for

01

Remaining runtime register is always 0 or a huge number. What is wrong?

Remaining Run Time is uint32 spanning two consecutive registers (address 128 and 129). If the ModbusCloud template is reading it as uint16, you see only half the value. Confirm the data type is uint32 in the template registers.

02

Why is the value 18000 when I expect seconds?

18000 seconds equals 5 hours, which is plausible for a lightly loaded SMT. The UPS exposes seconds, not minutes. Divide by 60 on the dashboard if you prefer minutes.

Registers (10)

10 read / 0 write

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