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Changes for page 5.2 Modbus protocol

Last modified by Admin on 2026/04/24 10:30
From version 6.1
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To version 11.1
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1 -drafts.BMS Main 2\.1.5\. Communication protocols.WebHome
1 +Battery management systems.BMS Main 2\.1.5\. Communication protocols.WebHome
Content
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1 -== 5.2.1 General information ==
1 +(% data-numbered-headings-start="5" style="--numbered-headings-start: 4;font-size: 0px;color: rgba(0, 0, 0, 0.0);margin-bottom: 0px; margin-top: 0px;" %)
2 += Communication protocols =
2 2  
4 +(% data-numbered-headings-start="2" style="--numbered-headings-start: 1;font-size: 0px;color: rgba(0, 0, 0, 0.0);margin-bottom: 0px; margin-top: 0px;" %)
5 +== Modbus protocol ==
6 +
7 +=== General information ===
8 +
3 3  The BMS Main 2.x device provides the information about the battery system using Modbus protocol. The BMS is a Modbus-server and it responds to the Modbus-client’s commands.
4 4  
5 5  Interaction with the device is performed over the RS-485 bus (Modbus RTU) or the Ethernet network (Modbus TCP).
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28 28  
29 29  Words are in the **little endian**.
30 30  
31 -== 5.2.2 Input registers ==
37 +=== Input registers ===
32 32  
33 33  (% style="width:651px" %)
34 34  |(% style="width:92px" %)**Register address**|(% style="width:94px" %)**Number of registers**|(% style="width:368px" %)**Content**|(% style="width:96px" %)**Type**
... ... @@ -234,7 +234,11 @@
234 234  
235 235  bit 25 – “Power up”;
236 236  
237 -bits 26-31 – reserved.
243 +bit 26 — signal “External 1”;
244 +
245 +bit 27 — signal “Heater (AUX)”;
246 +
247 +bits 28-31 — not used.
238 238  )))|(% style="width:96px" %)U32
239 239  |(% style="width:92px" %)**0x200B**|(% style="width:94px" %)1|(% style="width:368px" %)(((
240 240  Discrete output signals (bitfield):
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262 262  
263 263  bits 4-15 — not used.
264 264  )))|(% style="width:96px" %)U16
265 -|(% style="width:92px" %)**0x200E**|(% style="width:94px" %)2|(% style="width:368px" %)(((
275 +|(% style="width:92px" %)**0x200E-0x200F**|(% style="width:94px" %)2|(% style="width:368px" %)(((
266 266  Errors 2 (bitfield):
267 267  
268 268  bit 0 – "Low CH temperature", temperature is too low for charging;
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293 293  
294 294  bit 13 – “General error”;
295 295  
296 -bits 14-31 — reserved.
306 +bit 14 — reserved (set to 0);
307 +
308 +bit 15 — reserved (set to 0);
309 +
310 +bit 16 — reserved (set to 0);
311 +
312 +bit 17 — “Precharge error”;
313 +
314 +bits 18-31 — not used.
297 297  )))|(% style="width:96px" %)U32
298 298  |(% style="width:92px" %)**0x2010**|(% style="width:94px" %)1|(% style="width:368px" %)Address or the BMS Logic device whose parameters are in registers 0x2011-0x20C9|(% style="width:96px" %)U16
299 299  |(% style="width:92px" %)**0x2011**|(% style="width:94px" %)1|(% style="width:368px" %)(((
... ... @@ -347,13 +347,19 @@
347 347  |(% style="width:92px" %)**0x20F4**|(% style="width:94px" %)1|(% style="width:368px" %)(((
348 348  Discrete input signals 2 (bitfield):
349 349  
350 -bit 0 – “Fuse 2”;
368 +bit 0 — “Fuse 2”;
351 351  
352 -bit 1 – “Fuse 3”;
370 +bit 1 — “Fuse 3”;
353 353  
354 -bit 2 – “Circuit breaker status”;
372 +bit 2 — “Circuit breaker status”;
355 355  
356 -bits 3-15 – reserved.
374 +bit 3 — signal "Balancing request";
375 +
376 +bit 4 — signal "Close Main contactor";
377 +
378 +bit 5 — signal "Close External 1";
379 +
380 +bits 6-15 — not used.
357 357  )))|(% style="width:96px" %)U16
358 358  |(% style="width:92px" %)**0x2100-0x2101**|(% style="width:94px" %)2|(% style="width:368px" %)Battery state of charge (SOC), %|(% style="width:96px" %)REAL32
359 359  |(% style="width:92px" %)**0x2102**|(% style="width:94px" %)1|(% style="width:368px" %)Number of BMS Logic devices|(% style="width:96px" %)U16
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480 480  |(% style="width:92px" %)**0x2426**|(% style="width:94px" %)2|(% style="width:368px" %)Maximum charge current, A|(% style="width:96px" %)REAL32
481 481  |(% style="width:92px" %)**0x2428**|(% style="width:94px" %)2|(% style="width:368px" %)Maximum discharge current, A|(% style="width:96px" %)REAL32
482 482  
483 -== 5.2.3 Holding registers ==
507 +=== Holding registers ===
484 484  
485 485  (% style="width:653px" %)
486 486  |(% style="width:92px" %)**Register address**|(% style="width:94px" %)**Number of registers**|(% style="width:368px" %)**Content**|(% style="width:96px" %)**Type**