2. BMS1810 Pinouts and Descriptions

BMS1810 measures up to 18 cells on connectors 2 and 4 and drives the slave modules over the isolated daisy chain on connector 8. Power and the button come in on connectors 14 and 13, the current sensor on connector 7 and the temperature sensors on connector 9, the communication ports on connectors 11 and 12, and the inputs and outputs on connectors 6, 10 and 17. The solder pads 1, 3 and 5 carry the same pins as connectors 2, 4 and 9. Arrange the cables with the pinouts below; a number in the figures opens the table of that connector.

Danger

Check every connection and cable before you plug a connector into the BMS1810. Plug in connector 14 (supply and GND) first, then connector 2 and then connector 4; unplug in the reverse order (Connection order).

Fig.2.1: BMS1810, Board Pinout (TOP)

Fig.2.2: BMS1810, Board Pinout (LEFT)

Fig.2.3: BMS1810, Board Pinout (BACK)

Fig.2.4: BMS1810, Board Pinout (FRONT)

Fig.2.5: BMS1810, Board Pinout (RIGHT)

Table.2.1: Connector No#2, #1 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.2)
2	1	Bottom of the battery string, 1st cell's negative tab (C1-)
2	2	1st cell's positive tab (C1+)
2	3	2nd cell's positive tab (C2+)
2	4	3rd cell's positive tab (C3+)
2	5	4th cell's positive tab (C4+)
2	6	5th cell's positive tab (C5+)
2	7	6th cell's positive tab (C6+)
2	8	7th cell's positive tab (C7+)
2	9	8th cell's positive tab (C8+)
2	10	9th cell's positive tab (C9+)
1	-	Solder pads for wires or a pin header, the same pins as connector 2, not fitted in the standard product

Table.2.2: Connector No#4, #3 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.2)
4	1	10th cell's positive tab (C10+)
4	2	11th cell's positive tab (C11+)
4	3	12th cell's positive tab (C12+)
4	4	13th cell's positive tab (C13+)
4	5	14th cell's positive tab (C14+)
4	6	15th cell's positive tab (C15+)
4	7	16th cell's positive tab (C16+)
4	8	17th cell's positive tab (C17+)
4	9	Top of the battery string, 18th cell's positive tab (C18+)
3	-	Solder pads for wires or a pin header, the same pins as connector 4, not fitted in the standard product

Table.2.3: Connector No#9, #5 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.3)
9	1	Ground (GND) of Temperature Sensor No.1
9	2	External Temperature Sensor No.1 (NTC1)
9	3	Ground (GND) of Temperature Sensor No.2
9	4	External Temperature Sensor No.2 (NTC2)
9	5	Ground (GND) of Temperature Sensor No.3
9	6	External Temperature Sensor No.3 (NTC3)
9	7	Ground (GND) of Temperature Sensor No.4
9	8	External Temperature Sensor No.4 (NTC4)
9	9	Ground (GND) of Temperature Sensor No.5
9	10	External Temperature Sensor No.5 (NTC5)
5	-	Solder pads for wires or a pin header, the same pins as connector 9, not fitted in the standard product

Table.2.4: Connector No#6 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.3)
6	1	Relay 1 Common Pin (LiMon OUT 5)
6	2	High-Side Switch Output, 12V (LiMon OUT 2)
6	3	High-Side Switch Output, 12V (LiMon OUT 1)
6	4	Relay 1 Normally Closed Pin (LiMon OUT 5)
6	5	Relay 1 Normally Open Pin (LiMon OUT 5)
6	6	Board GND

Table.2.5: Connector No#7 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.3)
7	-	Current Sensor Connector
7	1	Current Sensor CH1 Sense Input (0-5V)
7	2	Current Sensor CH2 Sense Input (0-5V)
7	3	5V Output for Current Sensor Power
7	4	+12V Output
7	5	FET Temperature Sensor Input (NTC), not used by the current firmware
7	6	GND for Current Sensor Power

Table.2.6: Connector No#8 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.3)
8	-	Isolated Daisy-Chain Connector to the slave modules
8	1	Isolated daisy-chain communication port (ISO+)
8	2	Isolated daisy-chain communication port (ISO-)
8	3	Isolated daisy-chain communication port (ISO+)
8	4	Isolated daisy-chain communication port (ISO-)

Table.2.7: Connector No#10 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.4)
10	1, 2, 3, 4	Board GND
10	5	+12V Output
10	6	Optocoupler Input 1, ON when connected to GND (LiMon INPUT 1)
10	7	Optocoupler Input 2, ON when connected to GND (LiMon INPUT 2)
10	8	Open-Collector Output, 10 kΩ pull-up to 12V (LiMon OUT 4)
10	9	Open-Collector Output, 10 kΩ pull-up to 12V (LiMon OUT 3)
10	10	Not Connected

Table.2.8: Connector No#11 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.4)
11	1	RS232 No.0 Transmit Data (Service Port)
11	2	RS485 B Pin
11	3	Board GND
11	4	RS232 No.0 Receive Data (Service Port)
11	5	RS485 A Pin
11	6	+12V Output

Table.2.9: Connector No#12 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.4)
12	1	RS232 No.1 Transmit Data, not used by the current firmware
12	2	Board GND
12	3	CAN 2.0b Low Pin (CAN L)
12	4	RS232 No.1 Receive Data, not used by the current firmware
12	5	+12V Output
12	6	CAN 2.0b High Pin (CAN H)

Table.2.10: Connector No#13 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.4)
13	1	Board VIN+ Output
13	2	External LED- Output, switches to GND through 4.7 kΩ: an LED from pin 4 needs no resistor
13	3	External Button Input, a push-button to VIN+ (pin 1) starts the BMS
13	4	+12V Output

Table.2.11: Connector No#14 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.4)
14	1, 2	Board VIN+ (Board Main Power)
14	3	External Button Input, a push-button to VIN+ (pin 2) starts the BMS
14	4	Board GND (Board Main Power)

Table.2.12: Connector No#15 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1)
15	-	Port for LiBat Extension Board

Table.2.13: Connector No#17 Descriptions

Connector No.	Pin No.	Description (see Fig.2.1 and Fig.2.5)
17	1, 2	Relay 2 Common Pin (LiMon OUT 6)
17	3	Relay 2 Normally Open Pin (LiMon OUT 6)
17	4	Relay 2 Normally Closed Pin (LiMon OUT 6)