Boris 1.42 - Datasheet


The Boris Battery Monitoring System has been developed specifically for surveying an extended number of in-series connected batteries, like they can be found in industrial Uninterruptible Power Supplies (UPS) or in solar energy systems.

Central to the Boris BMS is the Boris 1.42 Battery Monitoring Device, a PCB developed by Seber-IT specifically for the task of checking on twelve(!) batteries, connected in series. The surveillance consists in measuring, at regular intervals, the Voltage and Temperature of the connected batteries. An on-board micro-processor with incorporated application program takes care, autonomously, of the necessary operations and activities.

Multiple Monitoring Devices can be connected in series, permitting simultaneous monitoring of long, high voltage battery strings. Multiple devices are connected to a a single RS-485 bus, in a daisy-chain like manner, supervised by one Master Control Unit.

General features


The board is powered through one of the two the RJ45-ports. It does not draw any current from the batteries being monitored, except for the voltage measurements

Maximum Voltage

The maximum acceptable voltage between the PLUS terminal of the highest, in voltage, battery connected to the board and Ground Reference is 750 VDC

Operating Temperature

Operating temperature must lie between -15 °C and +80 °C


The operational and communication logic is galvanically separated form the measurement circuitry. Board and connectors are contained in an ABS box, thus shielding the high voltage parts from the environment


Applied technology

The measurement section circuitry is based on the Analog Devices (ex Linear Technologies) LTC6804 integrated circuit


The board is able to monitor simultaneously up to twelve batteries connected in series

Maximum Battery Voltage

The device can monitor batteries with a maximum voltage (completely charged) of 15 VDC; for twelve batteries connected, this means that the maximum voltage difference the board can accept is 180 VDC


Voltage measurement precision: +- 2% @ 12 VDC

Temperature measurement

The battery body temperature is measured through the Th-02 thermo-sensor attached to the battery. Ref: Th-02-link


Temperature measurement precision: +- 0.1 °C @ 25 °C

Measurement duration

One cycle, consisting of twelve Voltage measurements, followed by twelve Temperature measurements, will complete in one second approximately


Control module

All on-board operations are controlled by an application program stored in the Integrated Control Module based on an ARM Cortex M0+ micro-processor and a 868 MHz Radio Transceiver


Microchip SAML21 MCU, circuit ARM Cortex M0+ @ 48MHz, 256 kbyte Flash Memory, 32 kbyte RAM

Radio module

Microchip ATA8510 Monolithic RF Transceiver


Extensive information on the Integrated Module can be found at: YARM by Acme Systems


By wire

Communication between the Master Control Unit and the board is achieved through standard RS-485 serial communication over Ethernet cat. 5 cable in half-duplex

Maximum devices, extension

Maximum distance between Master Control Unit and last board on the RS-485 bus: 1 km. The system can serve a maximum of 32 monitoring devices per bus

Serial transmission speed

Maximum transmission speed on RS-485 bus is 100 kbit/sec - default speed is 38.4 kbit/sec




The RJ45 ('Ethernet jack style') sockets on the board are

NOT Ethernet-LAN sockets

The Boris boards must NEVER be connected to Ethernet devices like hubs, switches or any other type of Ethernet port!!!


By radio

Communication between the Master Control Unit and the board is done via radio on the 868 MHz free ISM band in half-duplex

Maximum range, devices

Maximum distance between Master Control Unit and board in free air: up to 10 km. Inside buildings the range may extend up to several tens of meters, depending on the type of structural elements in the building. Via radio the system can serve a maximum of 64 monitoring devices per channel

Radio transmission speed

Maximum transmission speed via radio is 10 kbit/sec

Power supply and consumption

Power consumption

The board is powered through one of the two the RJ45-ports, supply voltage must lie between 12.0 and 13.5 VDC

Consumption in stand-by mode

When in the stand-by state the boards consumes approximately 1 mWatt of power

Peak consumption

During the measurement phase, the boards consumes 650 mWatt of power. Duration of this phase: 1 second