2. Connection - Movicom Electric Docs

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= Headers =

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The BMS Main 2.1 headers are shown in figure below.

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[[The BMS Main 2.1 headers>>image:1731516393377-928.jpeg||height="430" width="428"]]

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== P1 – header for power supply ==

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[[image:1731516593096-166.png||data-xwiki-image-style-alignment="center"]]

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|**Pin**|**Name**|**Description**

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|**1**|**GND**|Ground

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|**2**|**V+**|Supply voltage 9-30V

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== P15 – header for BMS Logic ==

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[[image:1731516577472-301.png||data-xwiki-image-style-alignment="center"]]

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|**Pin**|**Name**|**Description**

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|**1**|**RS485_A**|RS-485 line A for communication with BMS Logic

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|**2**|**RS485_B**|RS-485 line B for communication with BMS Logic

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|**3**|**+5V**|Supply voltage for BMS Logic

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|**4**|**GND**|Ground

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== P12 – header for current sensor ==

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[[image:1731516685999-633.png||data-xwiki-image-style-alignment="center"]]

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|**Pin**|**Name**|**Description**

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|**1**|**+5V**|Supply voltage for the current sensor 5V, max 50 mA

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|**2**|**GND**|Ground

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|**3**|**Vcs**|ADC input (current sensor output)

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|**4**|**Vref**|ADC input (current sensor reference signal)

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== P13 – header for humidity sensor ==

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[[image:1731516942455-641.png||data-xwiki-image-style-alignment="center"]]

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|**Pin**|**Name**|**Description**

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|**1**|**+5V**|Supply voltage 5 V, max 50 mA

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|**2**|**GND**|Ground

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|**3**|**Vhs**|ADC input (humidity sensor output)

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|**4**|**Vts**|ADC input (temperature sensor output)

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== P8 – header of relay 1 ==

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[[image:1731517023208-641.png||data-xwiki-image-style-alignment="center"]]

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By default, relay 1 is used to control the discharging contactor.

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|**Pin**|**Name**|**Description**

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|**1**|**V+**|Switching voltage (up to 55V, max 2A)

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|**2**|**NO**|Normally open contact

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== P9 – header of relay 2 ==

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[[image:1731517025702-799.png||data-xwiki-image-style-alignment="center"]]

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By default, relay 2 is used to output the “Allow charging” signal.

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|**Pin**|**Name**|**Description**

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|**1**|**V+**|Switching voltage (up to 55V, max 2A)

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|**2**|**NO**|Normally open contact

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== P6 – header of relay 3 ==

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[[image:1731517025702-799.png||data-xwiki-image-style-alignment="center"]]

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By default, relay 3 is used to control the charging contactor.

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|**Pin**|**Name**|**Description**

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|**1**|**V+**|Switching voltage (up to 55V, max 8A)

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|**2**|**NO**|Normally open contact

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== P7 – header of relay 4 ==

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[[image:1731517025702-799.png||data-xwiki-image-style-alignment="center"]]

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By default, relay 4 is used to control the heater.

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|**Pin**|**Name**|**Description**

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|**1**|**V+**|Switching voltage (up to 55V, max 8A)

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|**2**|**NO**|Normally open contact

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== P14 – header for CAN and RS-485 interfaces ==

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[[image:1731517180930-597.png||data-xwiki-image-style-alignment="center"]]

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|**Pin**|**Name**|**Description**

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|**1**|**EXT_RS485_A**|RS-485 line A for communication with external equipment

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|**2**|**CAN_H**|CAN H line for communication with external equipment

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|**3**|**+5V_CAN**|Supply voltage 5V for external devices, max 200 mA

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|**4**|**EXT_RS485_B**|RS-485 line B for communication with external equipment

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|**5**|**CAN_L**|CAN L line for communication with external equipment

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|**6**|**GND_CAN**|Ground

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== P21 – CAN termination resistor jumper ==

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[[image:1731517188900-976.png||data-xwiki-image-style-alignment="center"]]

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To connect the termination resistor between the lines **CAN_H** and **CAN_L**, install a jumper, according to the P21 pinout:

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|**Pin**|**Name**|**Description**

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|**1-2**|**120 Ohm**|Termination resistor 120 Ohm is connected

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|**2-3**|**-**|Termination resistor 120 Ohm is not connected

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== P22 - RS-485 termination resistor jumper ==

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[[image:1731517195672-298.png||data-xwiki-image-style-alignment="center"]]

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To connect the termination resistor between the **EXT_RS485_A** and **EXT_RS485_B** lines, install a jumper according to the P22 pinout:

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|**Pin**|**Name**|**Description**

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|**1-2**|**120 Ohm**|Terminating resistor 120 Ohm is connected

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|**2-3**|**-**|Terminating resistor 120 Ohm is not connected

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== P11 – header for discrete inputs/outputs ==

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[[image:1731517206246-979.png||data-xwiki-image-style-alignment="center"]]

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|**Pin**|**Name**|**Description**

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|**16**|**IN_1**|Discrete input #1 “dry contact” (+5V)

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|**8**|**GND_1**|Discrete input #1 “dry contact” (ground)

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|**15**|**IN_2**|Discrete input #2 “dry contact” (+5V)

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|**7**|**GND_2**|Discrete input #2 “dry contact” (ground)

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|**14**|**IN_3**|Discrete input #3 “dry contact” (+5V)

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|**6**|**GND_3**|Discrete input #3 “dry contact” (ground)

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|**13**|**IN_4**|Discrete input #4 “dry contact” (+5V)

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|**5**|**GND_4**|Discrete input #4 “dry contact” (ground)

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|**12**|**OUT_4**|Discrete output #4 (+5V, 20mA)

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|**4**|**GND_OUT_4**|Discrete output #4 (ground)

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|**11**|**OUT_3**|Discrete output #3 (+5V, 20mA)

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|**3**|**GND_OUT_3**|Discrete output #3 (ground)

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|**10**|**OUT_2**|Discrete output #2 (+5V, 20mA)

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|**2**|**GND_OUT_2**|Discrete output #2 (ground)

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|**9**|**OUT_1**|Discrete output #1 (+5V, 20mA)

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|**1**|**GND_OUT_1**|Discrete output #1 (ground)

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== DS1 – power indicator ==

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|**State**|**Description**

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|**Lights red**|The device is powered

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|**Off**|The device is not powered

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== DS2 – operation indicator ==

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|**State**|**Description**

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|**Blinking green**|The BMS firmware is running

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|**Off**|The BMS firmware is not running

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== DS3 – communication indicator ==

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|**State**|**Description**

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|**Blinking yellow (2Hz)**|Initializing communication with BMS Logic boards

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|**Blinking yellow (25Hz)**|Communication with BMS Logic is established

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== DS4 – error indicator ==

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|**State**|**Description**

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|**Blinking red**|Errors in communication with BMS Logic

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== DS7 – relay 1 indicator ==

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|**State**|**Description**

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|**Lights green**|Relay #1 is closed

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|**Off**|Relay #1 is opened

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== DS8 – relay 2 indicator ==

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|**State**|**Description**

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|**Lights green**|Relay #2 is closed

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|**Off**|Relay #2 is opened

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== DS5 – relay 3 indicator ==

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|**State**|**Description**

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|**Lights green**|Relay #3 is closed

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|**Off**|Relay #3 is opened

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== DS6 – relay 4 indicator ==

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|**State**|**Description**

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|**Lights green**|Relay #4 is closed

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|**Off**|Relay #4 is opened

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