USM21A interface adapter
USM21A | Technical data |
---|---|
Part number | 28231449 |
Ambient temperature | 0 °C to 40 °C |
Storage temperature | -25 °C to 70 °C |
Degree of protection | IP20 |
Dimensions | |
Width | 42 mm |
Height | 89 mm |
Depth | 25 mm |
An order using part number 28231449 includes the following parts:
- USM21A interface adapter
- USB connection cable for the USM21A – PC connection
- Serial interface cable with 2 RJ10 connectors
INFORMATION

To connect the inverter to the USM21A, you need an additional serial interface cable with an RJ10 connector and a 9‑pin D‑sub connector, part number 18123864.
This cable must be ordered separately.


The CDM11A diagnostic module is required to connect the MOVITRAC® basic inverter to the USM21A interface adapter.
The USM21A interface adapter can be used to perform a firmware update of the inverter.