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19 19  |Mounting holes|(% style="width:160px" %)M4
20 20  |Headers X1-X4 type|(% style="width:160px" %)Molex series Micro-Fit
21 21  
22 -
23 23  == 2.2 Headers description ==
24 24  
24 +The BMS Logic 12 is designed to measure temperature and voltage of 12 battery cells.
25 +
25 25  [[image:1733143089674-767.png||data-xwiki-image-style-alignment="center" height="356" width="531"]]
26 26  
27 -
28 +=== 2.2.1 X1 – header for cells ===
29 +
30 +[[image:1733143152741-474.jpeg||data-xwiki-image-style-alignment="center" height="81" width="210"]]
31 +
32 +|**Pin**|**Name**|**Description**
33 +|**1**|**V-**|Minus of the cell stack
34 +|**2**|**C2**|Cell #2
35 +|**3**|**C4**|Cell #4
36 +|**4**|**C6**|Cell #6
37 +|**5**|**C8**|Cell #8
38 +|**6**|**C10**|Cell #10
39 +|**7**|**C12**|Cell #12 (maximum potential of the cell stack)
40 +|**8**|-|-
41 +|**9**|**C1**|Cell #1 (minimum potential with respect to V-)
42 +|**10**|**C3**|Cell #3
43 +|**11**|**C5**|Cell #5
44 +|**12**|**C7**|Cell #7
45 +|**13**|**C9**|Cell #9
46 +|**14**|**C11**|Cell #11
47 +
48 +=== 2.2.2 X2 – header for temperature sensors ===
49 +
50 +[[image:1733143152745-708.jpeg||data-xwiki-image-style-alignment="center" height="92" width="368"]]
51 +
52 +|**Pin**|**Name**|**Description**
53 +|**1**|**TEMPG12**|Ground of the thermistor #12
54 +|**2**|**TEMPG11**|Ground of the thermistor #11
55 +|**3**|**TEMPG10**|Ground of the thermistor #10
56 +|**4**|**TEMPG9**|Ground of the thermistor #9
57 +|**5**|**TEMPG8**|Ground of the thermistor #8
58 +|**6**|**TEMPG7**|Ground of the thermistor #7
59 +|**7**|**TEMPG6**|Ground of the thermistor #6
60 +|**8**|**TEMPG5**|Ground of the thermistor #5
61 +|**9**|**TEMPG4**|Ground of the thermistor #4
62 +|**10**|**TEMPG3**|Ground of the thermistor #3
63 +|**11**|**TEMPG2**|Ground of the thermistor #2
64 +|**12**|**TEMPG1**|Ground of the thermistor #1
65 +|**13**|**TEMP12**|Signal from the thermistor #12
66 +|**14**|**TEMP11**|Signal from the thermistor #11
67 +|**15**|**TEMP10**|Signal from the thermistor #10
68 +|**16**|**TEMP9**|Signal from the thermistor #9
69 +|**17**|**TEMP8**|Signal from the thermistor #8
70 +|**18**|**TEMP7**|Signal from the thermistor #7
71 +|**19**|**TEMP6**|Signal from the thermistor #6
72 +|**20**|**TEMP5**|Signal from the thermistor #5
73 +|**21**|**TEMP4**|Signal from the thermistor #4
74 +|**22**|**TEMP3**|Signal from the thermistor #3
75 +|**23**|**TEMP2**|Signal from the thermistor #2
76 +|**24**|**TEMP1**|Signal from the thermistor #1
77 +
78 +=== 2.2.3 X3, X4 – headers for communication with BMS Main ===
79 +
80 +|**Pin**|**Name**|**Description**
81 +|**1**|**RS485_A**|RS-485 line A for communication with the BMS Main
82 +|**2**|**RS485_B**|RS-485 line B for communication with the BMS Main
83 +|**3**|**+5V**|Supply voltage 5V
84 +|**4**|**GND**|Ground
85 +
86 +== 2.3 Switches and indicators ==
87 +
88 +=== 2.3.1 SWD1 – address switch ===
89 +
90 +|**Switch number**|**Description**
91 +|**1**|The first (the lowest) bit of the address. Position ON - bit is 1
92 +|**2**|The second bit is the address. Position ON - bit is 1
93 +|**3**|The third bit of the address. Position ON - bit is 1
94 +|**4**|The fourth bit of the address. Position ON - bit is 1
95 +|**5**|The fifth (the highest) bit of the address. Position ON - bit is 1
96 +
97 +(% class="box infomessage" %)
98 +(((
99 +**Note: **There is no SWD1 switch in the recent revisions of the BMS Logic 12. The device address must be configured in the settings (see the section 3.2** **Configuration procedure).
100 +)))
101 +
102 +=== 2.3.2 SWD2 – RS-485 termination resistor switch ===
103 +
104 +To connect the termination resistor between the **RS485_A** and **RS485_B** lines, switch the SWD2 to the ON position.
105 +
106 +(% class="box infomessage" %)
107 +(((
108 +**Note: **There is no SWD2 switch in the recent revisions of the BMS Logic 12. Connect a 120 Ohm termination resistor directly to the X4 connector between the lines RS485_A and RS485_B.
109 +)))
110 +
111 +=== 2.3.3 DS1 – mode indicator ===
112 +
113 +(% style="width:718px" %)
114 +|**State**|(% style="width:422px" %)**Description**
115 +|Blinking|(% style="width:422px" %)Connection between the BMS Main and the device is established
116 +|Short flashing (~~50 milliseconds in a second)|(% style="width:422px" %)The device is measuring voltage and temperature. No communication between the BMS Main and the device
117 +|Long flashing (1 second in a 2 second period)|(% style="width:422px" %)The device is in the bootloader mode
118 +
119 +== 2.4 Connection procedure ==
120 +
121 +=== 2.4.1 Connection to BMS Main ===
122 +
123 +To connect the BMS Main to BMS Logic 12 do the following steps:
124 +
125 +1. Connect the BMS Main to the first BMS Logic 12 (P15 -> X3).
126 +1. Connect the BMS Logic 12 to each other (X4 -> X3).
127 +1. Switch SWD2 on the last BMS Logic 12 to the ON position or connect a 120 Ohm termination resistor directly to the X4 connector of the last BMS Logic 12.
128 +
129 +(% class="box infomessage" %)
130 +(((
131 +**Recommendations:**
132 +~1. The total cable length (the sum of the lengths of all cables) between the BMS Main and the last BMS Logic 12 should not exceed 500 meters.
133 +2. Make all connections with the same cable.
134 +3. For a total cable length of more than 10 meters use twisted pair with the 120 Ohm wave impedance.
135 +)))
136 +
137 +=== 2.4.2 Connecting battery cells ===
138 +
139 +To connect the battery cells, follow Figure 16. Incorrect connection of the cells can damage the BMS Logic 12.
140 +
141 +Begin the connection with the negative of the battery: the "V-" of the first BMS Logic 12 is connected to "B-", then the first cell (C1) of the battery is connected, then the second (C2), etc. The “V-“ of the next BMS Logic 12 is connected to the C12 of the previous BMS Logic 12. If not all inputs of the cells are used, then the remaining inputs are connected to the cell with the highest potential.
142 +
143 +
144 +[[image:1733143549304-570.jpeg||data-xwiki-image-style-alignment="center" height="572" width="662"]]
145 +
146 +(% class="box warningmessage" %)
147 +(((
148 +**Attention!**
149 +Connect the battery according to the diagram, otherwise the device may be damaged.
150 +)))
151 +
152 +=== 2.4.3 Connecting thermistors ===
153 +
154 +Thermistors should be fastened to the cells, excluding short circuits to the cell terminals (for example, isolate thermistors with heat shrink). For reliable operation, it is recommended to use all thermistors (a temperature sensor per cell).
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