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Changes for page 08 Communication

Last modified by Iris on 2025/07/24 15:23
From version 4.8
edited by Stone Wu
on 2022/07/07 15:18
Change comment: There is no comment for this version
To version 1.1
edited by Leo Wei
on 2022/06/08 12:57
Change comment: Imported from XAR

Summary

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Parent
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1 -Servo.1 User Manual.02 VD2 SA Series.WebHome
1 +Servo.2\. User Manual.06 VD2 SA Series Servo Drives Manual (Full V1\.1).WebHome
Author
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1 -XWiki.Stone
1 +XWiki.admin
Content
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6 6  
7 7  The position of RS485 communication port (take VD2B as an example) is as the figure below.
8 8  
9 -(% style="text-align:center" %)
10 -[[image:image-20220608154248-1.png]]
9 +[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_6583b880b8115df0.gif?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_6583b880b8115df0.gif"]]
11 11  
12 12  Figure 8-1 The position of RS485 communication port of VD2B drive
13 13  
14 -For the position of the RS485 communication port of other models, see __[[4.5 Communication signal wiring>>https://docs.we-con.com.cn/bin/view/Servo/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/04%20Wiring/#HCommunicationsignalwiring]]__.
13 +For the position of the RS485 communication port of other models, see __[[4.5 Communication signal wiring>>http://13.229.109.52:8080/wiki/servo/view/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/04%20Wiring/#HCommunicationsignalwiring]]__.
15 15  
16 16  The servo drive adopts RS485 half-duplex communication mode. The 485 bus should adopt the hand-in-hand structure instead of the star structure or the bifurcated structure. The star structure or bifurcation structure will produce reflected signals, which will affect the 485 communication.
17 17  
18 18  (% class="table-bordered" %)
19 -|(% style="text-align:center; vertical-align:middle" %)[[image:image-20220611153134-1.png]]
18 +|(% style="text-align:center; vertical-align:middle" %)[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_6db94f5d0421f97a.png?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_6db94f5d0421f97a.png"]]
20 20  |(((
21 21  ✎The wiring must use shielded twisted pair, stay away from strong electricity, do not run in parallel with the power line, let alone bundle it together!
22 22  
... ... @@ -23,8 +23,7 @@
23 23  ✎In a half-duplex connection, only one servo drive can communicate with the host computer at the same time. If two or more servo drives upload data at the same time, bus competition will occur. Not only will it lead to communication failure, it may also cause some components to generate large currents and damage the components.
24 24  )))
25 25  
26 -(% style="text-align:center" %)
27 -[[image:image-20220608174415-1.png]]
25 +[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_ec4180b4b0c8dd01.gif?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_ec4180b4b0c8dd01.gif"]]
28 28  
29 29  Figure 8-2 RS485 communication network wiring diagram
30 30  
... ... @@ -33,7 +33,7 @@
33 33  No point in the RS485 network can be directly grounded. All devices in the network must be well grounded through their own grounding terminals.
34 34  
35 35  (% class="table-bordered" %)
36 -|(% style="text-align:center; vertical-align:middle" %)[[image:image-20220611153144-2.png]]
34 +|(% style="text-align:center; vertical-align:middle" %)[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_6db94f5d0421f97a.png?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_6db94f5d0421f97a.png"]]
37 37  |Under no circumstances can the grounding wire form a closed loop.
38 38  
39 39  When wiring, consider the drive capability of the computer/PLC and the distance between the computer/PLC and the servo drive. If the drive capacity is insufficient, a repeater is needed.
... ... @@ -54,46 +54,58 @@
54 54  
55 55  (% class="table-bordered" %)
56 56  |(% style="text-align:center; vertical-align:middle" %)**Operate**|(% style="text-align:center; vertical-align:middle" %)**Command code**
57 -|(% style="text-align:center; vertical-align:middle" %)Read 16-bit/32-bit function code|(% style="text-align:center; vertical-align:middle" %)0x03
55 +|(% style="text-align:center; vertical-align:middle" %)Read 16-bit function code|(% style="text-align:center; vertical-align:middle" %)0x03
58 58  |(% style="text-align:center; vertical-align:middle" %)Write 16-bit function code|(% style="text-align:center; vertical-align:middle" %)0x06
59 -|(% style="text-align:center; vertical-align:middle" %)Write 32-bit function code|(% style="text-align:center; vertical-align:middle" %)0x10
60 60  
61 -**Read function code: 0x03**
58 +**(1) Read function code: 0x03**
62 62  
63 63  Request format:
64 64  
65 -|(% rowspan="2" %)**Address**|(% rowspan="2" %)**Function code**|(% colspan="2" %)**Initial address**|(% colspan="2" %)**Number of reads**|(% rowspan="2" %)**CRC check code**
66 -|**high byte**|**low byte**|**high byte**|**low byte**
67 -|1 byte|03|1 byte|1 byte|1 byte|1 byte|2 bytes
62 +(% class="table-bordered" %)
63 +|(% style="text-align:center; vertical-align:middle; width:84px" %)**Address**|(% style="text-align:center; vertical-align:middle; width:104px" %)**Function code**|(% style="text-align:center; vertical-align:middle; width:179px" %)(((
64 +**Initial address high byte**
65 +)))|(% style="text-align:center; vertical-align:middle; width:162px" %)(((
66 +**Initial address low byte**
67 +)))|(% style="text-align:center; vertical-align:middle; width:194px" %)(((
68 +**Number of reads high byte**
69 +)))|(% style="text-align:center; vertical-align:middle; width:195px" %)(((
70 +**Number of reads low byte**
71 +)))|(% style="text-align:center; vertical-align:middle; width:158px" %)**CRC check code**
72 +|(% style="text-align:center; vertical-align:middle; width:84px" %)1 byte|(% style="text-align:center; vertical-align:middle; width:104px" %)03|(% style="text-align:center; vertical-align:middle; width:179px" %)1 byte|(% style="text-align:center; vertical-align:middle; width:162px" %)1 byte|(% style="text-align:center; vertical-align:middle; width:194px" %)1 byte|(% style="text-align:center; vertical-align:middle; width:195px" %)1 byte|(% style="text-align:center; vertical-align:middle; width:158px" %)2 bytes
68 68  
69 69  Correct response format:
70 70  
71 -|(% rowspan="2" %)**Address**|(% rowspan="2" %)**Function code**|(% rowspan="2" %)**Number of bytes of returned data**|(% colspan="2" %)**Register 1**|(% rowspan="2" %)**…**|(% rowspan="2" %)**CRC check code**
72 -|**high byte**|**low byte**
73 -|1 byte|03|1 byte|1 byte|1 byte|…|2 bytes
76 +(% class="table-bordered" %)
77 +|(% style="text-align:center; vertical-align:middle; width:85px" %)**Address**|(% style="text-align:center; vertical-align:middle; width:139px" %)**Function code**|(% style="text-align:center; vertical-align:middle; width:244px" %)(((
78 +**Return data number of bytes**
79 +)))|(% style="text-align:center; vertical-align:middle; width:203px" %)(((
80 +**Register 1 high byte**
81 +)))|(% style="text-align:center; vertical-align:middle; width:190px" %)(((
82 +**Register 1 low byte**
83 +)))|(% style="text-align:center; vertical-align:middle; width:72px" %)…|(% style="text-align:center; vertical-align:middle; width:143px" %)**CRC check code**
84 +|(% style="text-align:center; vertical-align:middle; width:85px" %)1 byte|(% style="text-align:center; vertical-align:middle; width:139px" %)03|(% style="text-align:center; vertical-align:middle; width:244px" %)1 byte|(% style="text-align:center; vertical-align:middle; width:203px" %)1 byte|(% style="text-align:center; vertical-align:middle; width:190px" %)1 byte|(% style="text-align:center; vertical-align:middle; width:72px" %)…|(% style="text-align:center; vertical-align:middle; width:143px" %)2 bytes
74 74  
75 -**Write function code: 0x06**
86 +**(2) Write function code: 0x06**
76 76  
77 77  Request format:
78 78  
79 -|(% rowspan="2" %)**Address**|(% rowspan="2" %)**Function code**|(% colspan="2" %)(((
80 -**Register address**
81 -)))|(% colspan="2" %)**Data**|(% rowspan="2" %)**CRC check code**
82 -|**high byte**|**low byte**|**high byte**|**low byte**
83 -|1 byte|06|1 byte|1 byte|1 byte|1 byte|2 bytes
90 +(% class="table-bordered" %)
91 +|(% style="text-align:center; vertical-align:middle" %)**Address**|(% style="text-align:center; vertical-align:middle" %)**Function code**|(% style="text-align:center; vertical-align:middle" %)**Register address high byte**|(% style="text-align:center; vertical-align:middle" %)**Register address low byte**|(% style="text-align:center; vertical-align:middle" %)**Data high byte**|(% style="text-align:center; vertical-align:middle" %)**Data low byte**|(% style="text-align:center; vertical-align:middle" %)**CRC check code**
92 +|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)06|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)2 bytes
84 84  
85 85  Response format:
86 86  
87 -|(% rowspan="2" %)**Address**|(% rowspan="2" %)**Function code**|(% colspan="2" %)**Register address**|(% colspan="2" %)**Data**|(% rowspan="2" %)**CRC check code**
88 -|**high byte**|**low byte**|**high byte**|**low byte**
89 -|1 byte|06|1 byte|1 byte|1 byte|1 byte|2 bytes
96 +(% class="table-bordered" %)
97 +|(% style="text-align:center; vertical-align:middle" %)**Address**|(% style="text-align:center; vertical-align:middle" %)**Function code**|(% style="text-align:center; vertical-align:middle" %)**Register address high byte**|(% style="text-align:center; vertical-align:middle" %)**Register address low byte**|(% style="text-align:center; vertical-align:middle" %)**Data high byte**|(% style="text-align:center; vertical-align:middle" %)**Data low byte**|(% style="text-align:center; vertical-align:middle" %)**CRC check code**
98 +|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)06|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)2 bytes
90 90  
91 91  If the setting is successful, the original is returned
92 92  
93 -|(% rowspan="2" %)**There should be a message interval not less than 3.5 characters at the beginning**|**Address**|**Function code**|**Data**|**CRC check code**
94 -|1 byte|1 byte|N bytes|2 bytes
102 +(% class="table-bordered" %)
103 +|(% rowspan="2" style="text-align:center; vertical-align:middle" %)**There should be a message interval not less than 3.5 characters at the beginning**|(% style="text-align:center; vertical-align:middle" %)**Address**|(% style="text-align:center; vertical-align:middle" %)**Function code**|(% style="text-align:center; vertical-align:middle" %)**Data**|(% style="text-align:center; vertical-align:middle" %)**CRC check code**
104 +|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)1 byte|(% style="text-align:center; vertical-align:middle" %)N bytes|(% style="text-align:center; vertical-align:middle" %)2 bytes
95 95  
96 -(% style="color:inherit; font-family:inherit; font-size:26px" %)**CRC check**
106 +== **CRC check** ==
97 97  
98 98  The servo uses a 16-bit CRC check, and the host computer must also use the same check rule, otherwise the CRC check will make mistake. When transmitting, the low bit is in the front and the high bit is at the back. The CRC code are as follows:
99 99  
... ... @@ -199,8 +199,7 @@
199 199  
200 200  = **Servo communication parameter setting** =
201 201  
202 -(% style="text-align:center" %)
203 -[[image:image-20220608174504-2.png]]
212 +[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_fd76131f4dd0361c.gif?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_fd76131f4dd0361c.gif"]]
204 204  
205 205  Figure 8-3 Modbus communication parameter setting process
206 206  
... ... @@ -235,7 +235,7 @@
235 235  If you need to change the value of the function code frequently, it is recommended to turn off the function of real-time writing to EERPOM of function code, otherwise the EEPROM will be shortened due to frequent erasing and writing of the EEPROM.
236 236  
237 237  (% class="table-bordered" %)
238 -|(% style="text-align:center; vertical-align:middle" %)[[image:image-20220611153214-3.png]]
247 +|(% style="text-align:center; vertical-align:middle" %)[[image:http://docs.we-con.com.cn/wiki/servo/download/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/WebHome/Wecon%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29_html_6db94f5d0421f97a.png?rev=1.1||alt="Wecon VD2 SA Series Servo Drives Manual (Full V1.1)_html_6db94f5d0421f97a.png"]]
239 239  |After the EEPROM is damaged, the servo will have an non resettable fault!
240 240  
241 241  **(5) Set the high and low order of the 32-bit monitoring data**
... ... @@ -247,16 +247,16 @@
247 247  The description of related function codes are as follows.
248 248  
249 249  (% class="table-bordered" %)
250 -|(% style="text-align:center; vertical-align:middle; width:121px" %)**Function code**|(% style="text-align:center; vertical-align:middle; width:205px" %)**Name**|(% style="text-align:center; vertical-align:middle; width:187px" %)(((
259 +|(% style="text-align:center; vertical-align:middle; width:121px" %)**Function code**|(% style="text-align:center; vertical-align:middle; width:205px" %)**Name**|(% style="text-align:center; vertical-align:middle; width:135px" %)(((
251 251  **Setting method**
252 -)))|(% style="text-align:center; vertical-align:middle; width:186px" %)(((
261 +)))|(% style="text-align:center; vertical-align:middle; width:171px" %)(((
253 253  **Effective time**
254 -)))|(% style="text-align:center; vertical-align:middle; width:130px" %)**Default value**|(% style="text-align:center; vertical-align:middle; width:132px" %)**Range**|(% style="text-align:center; vertical-align:middle; width:335px" %)**Definition**|(% style="text-align:center; vertical-align:middle; width:189px" %)**Unit**
255 -|(% style="text-align:center; vertical-align:middle; width:121px" %)P12-02|(% style="text-align:center; vertical-align:middle; width:205px" %)Baud rate|(% style="text-align:center; vertical-align:middle; width:187px" %)(((
263 +)))|(% style="text-align:center; vertical-align:middle; width:115px" %)**Default value**|(% style="text-align:center; vertical-align:middle; width:61px" %)**Range**|(% style="text-align:center; vertical-align:middle; width:347px" %)**Definition**|(% style="text-align:center; vertical-align:middle" %)**Unit**
264 +|(% style="text-align:center; vertical-align:middle; width:121px" %)P12-02|(% style="text-align:center; vertical-align:middle; width:205px" %)Baud rate|(% style="text-align:center; vertical-align:middle; width:135px" %)(((
256 256  Operation setting
257 -)))|(% style="text-align:center; vertical-align:middle; width:186px" %)(((
266 +)))|(% style="text-align:center; vertical-align:middle; width:171px" %)(((
258 258  Effective immediately
259 -)))|(% style="text-align:center; vertical-align:middle; width:130px" %)2|(% style="text-align:center; vertical-align:middle; width:132px" %)0 to 5|(% style="width:335px" %)(((
268 +)))|(% style="text-align:center; vertical-align:middle; width:115px" %)2|(% style="text-align:center; vertical-align:middle; width:61px" %)0 to 5|(% style="width:347px" %)(((
260 260  0-2400bps
261 261  
262 262  1-4800bps
... ... @@ -268,12 +268,12 @@
268 268  4-38400bps
269 269  
270 270  5-57600bp
271 -)))|(% style="text-align:center; vertical-align:middle; width:189px" %)-
272 -|(% style="text-align:center; vertical-align:middle; width:121px" %)P12-03|(% style="text-align:center; vertical-align:middle; width:205px" %)Serial data format|(% style="text-align:center; vertical-align:middle; width:187px" %)(((
280 +)))|(% style="text-align:center; vertical-align:middle" %)-
281 +|(% style="text-align:center; vertical-align:middle; width:121px" %)P12-03|(% style="text-align:center; vertical-align:middle; width:205px" %)Serial data format|(% style="text-align:center; vertical-align:middle; width:135px" %)(((
273 273  Operation setting
274 -)))|(% style="text-align:center; vertical-align:middle; width:186px" %)(((
283 +)))|(% style="text-align:center; vertical-align:middle; width:171px" %)(((
275 275  Effective immediately
276 -)))|(% style="text-align:center; vertical-align:middle; width:130px" %)0|(% style="text-align:center; vertical-align:middle; width:132px" %)0 to 3|(% style="width:335px" %)(((
285 +)))|(% style="text-align:center; vertical-align:middle; width:115px" %)0|(% style="text-align:center; vertical-align:middle; width:61px" %)0 to 3|(% style="width:347px" %)(((
277 277  0: 1 stop bit, no parity
278 278  
279 279  1: 1 stop bit, odd parity
... ... @@ -281,16 +281,16 @@
281 281  2: 1 stop bit, even parity
282 282  
283 283  3: 2 stop bits, no parity
284 -)))|(% style="text-align:center; vertical-align:middle; width:189px" %)-
285 -|(% style="text-align:center; vertical-align:middle; width:121px" %)P12-04|(% style="text-align:center; vertical-align:middle; width:205px" %)Modbus communication data is written into EEPROM|(% style="text-align:center; vertical-align:middle; width:187px" %)(((
293 +)))|(% style="text-align:center; vertical-align:middle" %)-
294 +|(% style="text-align:center; vertical-align:middle; width:121px" %)P12-04|(% style="text-align:center; vertical-align:middle; width:205px" %)Modbus communication data is written into EEPROM|(% style="text-align:center; vertical-align:middle; width:135px" %)(((
286 286  Operation setting
287 -)))|(% style="text-align:center; vertical-align:middle; width:186px" %)(((
296 +)))|(% style="text-align:center; vertical-align:middle; width:171px" %)(((
288 288  Effective immediately
289 -)))|(% style="text-align:center; vertical-align:middle; width:130px" %)0|(% style="text-align:center; vertical-align:middle; width:132px" %)0 to 1|(% style="width:335px" %)(((
298 +)))|(% style="text-align:center; vertical-align:middle; width:115px" %)0|(% style="text-align:center; vertical-align:middle; width:61px" %)0 to 1|(% style="width:347px" %)(((
290 290  0: Do not write to EEPROM, and do not store after power failure;
291 291  
292 292  1: Write to EEPROM, power-down storage.
293 -)))|(% style="text-align:center; vertical-align:middle; width:189px" %)-
302 +)))|(% style="text-align:center; vertical-align:middle" %)-
294 294  
295 295  = **Modbus communication variable address and value** =
296 296  
... ... @@ -334,7 +334,7 @@
334 334  )))|(% style="text-align:center; vertical-align:middle" %)**Category**|(% style="text-align:center; vertical-align:middle" %)**Name**
335 335  |(% style="text-align:center; vertical-align:middle" %)P0-1|(% style="text-align:center; vertical-align:middle" %)0x0001|(% style="text-align:center; vertical-align:middle" %)1|(% style="text-align:center; vertical-align:middle" %)Basic settings|(% style="text-align:center; vertical-align:middle" %)Control mode
336 336  
337 -For detailed parameter addresses, please refer to __[["11.1 Lists of parameters".>>https://docs.we-con.com.cn/bin/view/Servo/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/11%20Appendix/#HListsofparameters]]__
346 +For detailed parameter addresses, please refer to __[["11.1 Lists of parameters".>>http://13.229.109.52:8080/wiki/servo/view/2.%20User%20Manual/06%20VD2%20SA%20Series%20Servo%20Drives%20Manual%20%28Full%20V1.1%29/11%20Appendix/#HListsofparameters]]__
338 338  
339 339  == **Variable value type description** ==
340 340  
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