---
name: "asem"
section: "8"
platform: "linux"
package: "nut-i2c"
version: "2.8.1-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/asem"
---

# asem(8)

driver for UPS in ASEM PB1300

## NAME

asem - driver for UPS in ASEM PB1300

## NOTE

This man page only documents the hardware-specific features of the **asem** driver. For information about the core driver, see [**nutupsdrv**(8)](/nutupsdrv/8.md).

## SUPPORTED HARDWARE

The **asem** driver supports the UPS in ASEM PB1300 embedded PCs. Likely other I2C devices from the same manufacturer will work too, since this is a "custom" charger.

Seems that there are two versions of the charger. Older one is based on Max1667, newer one is a custom solution. Both are on I2C address 0x09. To be compatible with both versions, the driver just reads bit 15 of address 0x13 which yields online/on battery status. Battery monitor is a BQ2060 at address 0x0B.

## EXTRA ARGUMENTS

The required parameter for this driver is the I2C bus name:

**port**=*dev-node*

On the Asem PB1300, this should be /dev/i2c-7 for the i801 SMBUS adapter.

This driver also supports the following optional settings:

**lb**=*num*

Set the low battery threshold to *num* volts.

**hb**=*num*

Set the high battery threshold to *num* volts.

## INSTALLATION

This driver is specific to the Linux I2C API, and requires the lm\_sensors libi2c-dev or its equivalent to compile.

Beware that the SystemIO memory used by the I2C controller is reserved by ACPI. If only a native I2C driver (e.g. i2c\_i801, as of 3.5.X Linux kernels) is available, then you’ll need to relax the ACPI resources check. For example, you can boot with the acpi\_enforce\_resources=lax option.

## KNOWN ISSUES AND BUGS

The driver shutdown function is not implemented, so other arrangements must be made to turn off the UPS.

## AUTHOR

Giuseppe Corbelli \<giuseppe.corbelli@copanitalia.com\>

## SEE ALSO

### The core driver:

[**nutupsdrv**(8)](/nutupsdrv/8.md)

### Internet resources:

• PB1300 specifications: http://www.asem.it/en/products/industrial-automation/box-pcs/performance/pb1300/

• BQ2060 datasheet: http://www.ti.com/lit/ds/symlink/bq2060.pdf

• The NUT (Network UPS Tools) home page: https://www.networkupstools.org/