2. BMS1801 Pinouts and Descriptions

On BMS1801 there are connectors for cell connections, temperature sensors, relay output, digital communication ports, board power,on board current sensor, charge discharge FETs and I/Os. User must arrange the cable connections to any of these connectors by guides and pinouts below.

Danger

Make sure all the connections done correctly and double check the cables. Think twice before plug into any connectors on BMS1801.

Fig.2.1: BMS1801, Board Pinout (TOP)

Fig.2.2: BMS1801, Board Pinout (LEFT)

Fig.2.3: BMS1801, Board Pinout (FRONT)

Fig.2.4: BMS1801, Board Pinout (BACK)

Connector No.	Pin No.	Description (Refer the Fig.2.1 and Fig.2.2)
1 or 2	1	Bottom cell of the battery string. 1st cell's negative tab. (C1-)
1 or 2	2	1st cell's positive tab. (C1+)
1 or 2	3	2nd cell's positive tab. (C2+)
1 or 2	4	3rd cell's positive tab. (C3+)
1 or 2	5	4th cell's positive tab. (C4+)
1 or 2	6	5th cell's positive tab. (C5+)
1 or 2	7	6th cell's positive tab. (C6+)
1 or 2	8	7th cell's positive tab. (C7+)
1 or 2	9	8th cell's positive tab. (C8+)
1 or 2	10	9th cell's positive tab. (C9+)
3 or 4	1	10th cell's positive tab. (C10+)
3 or 4	2	11th cell's positive tab. (C11+)
3 or 4	3	12th cell's positive tab. (C12+)
3 or 4	4	13th cell's positive tab. (C13+)
3 or 4	5	14th cell's positive tab. (C14+)
3 or 4	6	15th cell's positive tab. (C15+)
3 or 4	7	16th cell's positive tab. (C16+)
3 or 4	8	17th cell's positive tab. (C17+)
3 or 4	9	Top cell of the battery string, 18th cell's positive tab. (C18+)

Connector No.	Pin No.	Description (Refer the Fig.2.1 and Fig.2.3)
5 or 6	1-2	External Temperature sensor No.1
5 or 6	3-4	External Temperature sensor No.2
5 or 6	5-6	External Temperature sensor No.3
5 or 6	7-8	External Temperature sensor No.4
5 or 6	9-10	External Temperature sensor No.5

Connector No.	Pin No.	Description (Refer the Fig.2.1 and Fig.2.4)
7 or 8	1	Board Ground
7 or 8	2	Current Sense Channel - 1 (0-5V)
7 or 8	3	Current Sense Channel - 2 (0-5V)
7 or 8	4	5V for Current Sensor (Don't use something else)

Connector No.	Pin No.	Description (Refer the Fig.2.1)
9	L-	LOAD Ground Connection
10	B-	BATTERY Ground Connection
11	-	TTL Output Voltage Source Setting
17	-	External On/Off Button Connector
18	-	Port for LiBat Extension Board

Connector No.	Pin No.	Description (Refer the Fig.2.1 and Fig.2.3)
12	1	Board VIN+ Output
12	2	External Led GND Output
12	3	External Button Input
12	4	+12V Output

Connector No.	Pin No.	Description (Refer the Fig.2.1 and Fig.2.3)
13	1	RS232 No.1 Transmit Data
13	2	Board Ground
13	3	CAN 2.0b Low Pin
13	4	RS232 No.1 Receive Data
13	5	+12V Output
13	6	CAN 2.0b High Pin

Connector No.	Pin No.	Description (Refer the Fig.2.1 and Fig.2.3)
14	1	RS232 No.0 Transmit Data (Service Port)
14	2	RS485 No.2 B Pin
14	3	Board Ground
14	4	RS232 No.0 Receive Data (Service Port)
14	5	RS485 No.2 A Pin
14	6	+12V Output

Connector No.	Pin No.	Description (Refer the Fig.2.1 and Fig.2.3)
15	1, 2, 3, 4	Board Ground
15	5	+12V Output
15	6	TTL Input - 2 (0-5V)
15	7	TTL Input - 1 (0-5V)
15	8	TTL Output - 2 (Normally 0-5V but may vary on Con.No.6 settings)
15	9	TTL Output - 1 (Normally 0-5V but may vary on Con.No.6 settings)
15	10	External Voltage Source for TTL Outputs

Connector No.	Pin No.	Description (Refer the Fig.2.1 and Fig.2.3)
16	1	Relay 1 Common Pin
16	2	Open Drain Output No.2
16	3	Open Drain Output No.1
16	4	Relay 1 Normally Closed Pin
16	5	Relay 1 Normally Open Pin
16	6	Board Ground