BMS Repeater

Last modified by Admin on 2025/05/28 18:26

General information

The BMS Repeater is a device for relaying RS-485 signals from one subnetwork to another and vice versa.

The device provides galvanic isolation up to 3500 V RMS.

Specifications

Parameter	Value
Supply voltage, V	5.0 ± 0.5
Current consumption @5 V, mA (no load; max)	40
RS-485 baud rate, bps (max)	115200
Output voltage, V	5.0 ± 0.5
Output current, mA (max)	400
Dimensions (length × width × height), mm	64 × 30 × 16
Weight, g	13 ± 5
Operating conditions
Operating temperature range, ° С	-40 to +85
Degree of protection from external influences	IP00
Header types	Molex series Mini-Fit

Connection

The BMS can be connected to batteries with life-threatening and health-hazardous voltage levels. When working with high-voltage batteries, observe electrical safety regulations, use safety glasses, protective clothing, insulated tools and appliances. To prevent the damage of device avoid electrostatic discharges while working with the battery.

The BMS Repeater a header to connect the any BMS Main board and a header to connect any BMS Logic board. It also has jumpers to connect bias resistors to the RS-485 bus subnetworks.

Parameter	Value
Overall dimensions (length × width × height), mm	64 × 30 × 16
Mounting dimensions (length × width), mm	57 × 23
Mounting holes	M3

X1 – header for communication with BMS Main board

Receptacle Housing: Molex 39012040. Terminals: Molex 5556

Pin	Name	Description
1	RS485_A1	RS-485 line A for communication with the BMS Main
2	RS485_B1	RS-485 line B for communication with the BMS Main
3	+5V	Supply voltage 5V
4	GND1	Ground

X2 – header for communication with BMS Logic board

Receptacle Housing: Molex 39012040. Terminals: Molex 5556

Pin	Name	Description
1	RS485_A2	RS-485 line A for communication with BMS Logic
2	RS485_B2	RS-485 line B for communication with BMS Logic
3	OUT_5V	Output voltage 5V, max 400 mA
4	GND2	Ground

P1, P2 – jumpers for bias resistors of subnetwork 1

To connect the bias resistors setting proper RS-485 bus levels on the BMS Main subnetwork install the P1 and P2 jumpers.

Do not connect the second pair of bias resistors to the same RS-485 subnetwork.

P3, P4 – jumpers for bias resistors of subnetwork 2

To connect the bias resistors setting proper RS-485 bus levels on the BMS Logic subnetwork install the P3 and P4 jumpers.