====== BM-SM ======

**BTMS String master**


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| Order code:  ^ BM-SM-xx        (xx-see manual)      ^
| Mounting:    | On battery or rail, 3M double sided adhesive tape, DIN rail   |
| Dimensions:  | 60 × 80 × 30 mm  |

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===== Highlights & Features =====

  * String DC voltage, string charge-discharge current, charge-discharge state and string SOC.
  * Voltage, internal resistance, temperature, SOC and SOH of each battery (with BM-CS sensor).
  * Two serial ports for optional sensors and touch display.
  * Power supply (4W) directly from POE Ethernet.
  * Sensor auto-addressing. Insulated sensor bus. 
  * Advanced measurement algorithm.
  * Programmable (EN-61131-3) actions: disconnect string, turn ventilation ON, etc.
  * Balancing function: Keep voltage balanced during the floating charge phase of battery pack, keeping the individual battery in the best state, extending backup time and life span of battery pack.
  * Supports up to 80 cell sensors, 1000V system 

===== Technical specification =====

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^ Power supply           | Nominal                      | POE              |
| :::                    | :::                          | :::              |
^ Power loss             | ≤ 2W                                           ||
^ Operating temperature  | Standard                     | 0 .. 45 °C       |
| :::                    | Limit                        | -10 .. 55 °C     |
^ Storage temperature    | -40 .. 70 °C                                   ||
^ Working humidity       | 5 .. 95 %RH, non-condensing                    ||
^ Dimensions:            | Width                        | 60 mm            |
| :::                    | Height                       | 80 mm            |
| :::                    | Depth                        | 30 mm            |
^ Voltage measurements   | Range                        | 20 .. 800 VDC    |
| :::                    | Accuracy                     | ± 0.5 %          |
| :::                    | Resolution                   | 0.01 VDC         |
^ Current measurements   | Range                        | -1000 .. 1000 A  |
| :::                    | Accuracy                     | ± 2 %            |
| :::                    | Resolution                   | 0.01 ADC         |


**LED indicator**

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^ Normal operation  | Green LED  |
^ Alarm             | Red LED    |

===== Wiring =====

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