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Changes for page 5.2 Modbus protocol

Last modified by Admin on 2026/04/24 10:30
From version 8.3
edited by Admin
on 2025/02/04 10:04
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To version 5.2
edited by Admin
on 2024/12/04 10:49
Change comment: Update document after refactoring.

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Title
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1 -5.2 Modbus protocol
1 +4.2 Modbus protocol
Parent
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1 -Battery management systems.BMS Main 2\.1.5\. Communication protocols.WebHome
1 +drafts.BMS Main 2\.1.5\. Communication protocols.WebHome
Content
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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 =
1 +== 4.2.1 General information ==
3 3  
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 -
9 9  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.
10 10  
11 11  Interaction with the device is performed over the RS-485 bus (Modbus RTU) or the Ethernet network (Modbus TCP).
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34 34  
35 35  Words are in the **little endian**.
36 36  
37 -=== Input registers ===
31 +== 4.2.2 Input registers ==
38 38  
39 39  (% style="width:651px" %)
40 40  |(% style="width:92px" %)**Register address**|(% style="width:94px" %)**Number of registers**|(% style="width:368px" %)**Content**|(% style="width:96px" %)**Type**
... ... @@ -268,7 +268,7 @@
268 268  
269 269  bits 4-15 — not used.
270 270  )))|(% style="width:96px" %)U16
271 -|(% style="width:92px" %)**0x200E-0x200F**|(% style="width:94px" %)2|(% style="width:368px" %)(((
265 +|(% style="width:92px" %)**0x200E**|(% style="width:94px" %)2|(% style="width:368px" %)(((
272 272  Errors 2 (bitfield):
273 273  
274 274  bit 0 – "Low CH temperature", temperature is too low for charging;
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299 299  
300 300  bit 13 – “General error”;
301 301  
302 -bit 14-16 — reserved (set to 0);
303 -
304 -bit 17 — “Precharge error”;
305 -
306 -bits 19-31 — not used.
296 +bits 14-31 — reserved.
307 307  )))|(% style="width:96px" %)U32
308 308  |(% 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
309 309  |(% style="width:92px" %)**0x2011**|(% style="width:94px" %)1|(% style="width:368px" %)(((
... ... @@ -357,19 +357,13 @@
357 357  |(% style="width:92px" %)**0x20F4**|(% style="width:94px" %)1|(% style="width:368px" %)(((
358 358  Discrete input signals 2 (bitfield):
359 359  
360 -bit 0 — “Fuse 2”;
350 +bit 0 – “Fuse 2”;
361 361  
362 -bit 1 — “Fuse 3”;
352 +bit 1 – “Fuse 3”;
363 363  
364 -bit 2 — “Circuit breaker status”;
354 +bit 2 – “Circuit breaker status”;
365 365  
366 -bit 3 — signal "Balancing request";
367 -
368 -bit 4 — signal "Close Main contactor";
369 -
370 -bit 5 — signal "Close External 1";
371 -
372 -bits 6-15 — not used.
356 +bits 3-15 – reserved.
373 373  )))|(% style="width:96px" %)U16
374 374  |(% style="width:92px" %)**0x2100-0x2101**|(% style="width:94px" %)2|(% style="width:368px" %)Battery state of charge (SOC), %|(% style="width:96px" %)REAL32
375 375  |(% style="width:92px" %)**0x2102**|(% style="width:94px" %)1|(% style="width:368px" %)Number of BMS Logic devices|(% style="width:96px" %)U16
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496 496  |(% style="width:92px" %)**0x2426**|(% style="width:94px" %)2|(% style="width:368px" %)Maximum charge current, A|(% style="width:96px" %)REAL32
497 497  |(% style="width:92px" %)**0x2428**|(% style="width:94px" %)2|(% style="width:368px" %)Maximum discharge current, A|(% style="width:96px" %)REAL32
498 498  
499 -=== Holding registers ===
483 +== 4.2.3 Holding registers ==
500 500  
501 501  (% style="width:653px" %)
502 502  |(% style="width:92px" %)**Register address**|(% style="width:94px" %)**Number of registers**|(% style="width:368px" %)**Content**|(% style="width:96px" %)**Type**