Wiki source code of Application Note : Communicate with Different Sensors ----- RS485-LN / RS485-BL

Version 62.2 by Xiaoling on 2024/05/30 17:46

version	line-number	content
57.14	1	Table of Contents:
6.2	2
	3	{{toc/}}
	4
41.2	5
	6
	7
	8
	9
60.12	10	= 1. Introduction =
1.1	11
57.6	12
1.2	13	This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
1.1	14
38.2	15
60.12	16	== 1.1 Example 1: Connect to Leak relay and VFD ==
60.5	17
1.1	18
1.2	19	This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to Relay and VFD and communicate with Mobile. The structure is like below:
1.1	20
60.5	21
60.10	22	[[image:image-20220527091852-1.png\|\|height="547" width="994"]]
1.1	23
60.12	24	Connection
1.1	25
1.18	26
10.2	27	[[image:image-20220527091942-2.png]](% style="display:none" %)
	28
60.12	29	Connection
1.1	30
10.2	31
57.15	32	(% style="color:blue" %)Related documents:
1.1	33
60.13	34	* System Structure: [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/\|\|_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
	35
60.1	36	* Explanation on how to integrate to Node-red and to the Mobile Phone, and with link to the Github code: [[Configure Manual>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/\|\|_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
60.13	37
1.2	38	* [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
1.1	39
62.2	40
	41
60.12	42	== 1.2 Example 2: Connect to Pulse Counter ==
1.1	43
57.7	44
1.2	45	This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to Pulse Counter and communicate with Mobile. This example and example 2 compose the structure for a farm IoT solution. The structure is like below:
1.1	46
57.7	47
60.10	48	[[image:image-20220527092058-3.png\|\|height="552" width="905"]]
1.1	49
60.12	50	Connection
1.1	51
1.18	52
60.10	53	[[image:image-20220527092146-4.png\|\|height="507" width="906"]]
1.2	54
60.12	55	Connection
1.2	56
41.12	57
57.15	58	(% style="color:blue" %)Related documents:
	59
60.1	60	* Configure Document: [[Pickdata MIO40 water pulse counter to LoRa with Dragino RS485-LN>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Pulse-Counter/\|\|_mstmutation="1"]]
60.13	61
1.2	62	* [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
	63
62.2	64
	65
60.12	66	== 1.3 Example 3: Use RS485-LN with energy meters ==
1.2	67
60.12	68	=== 1.3.1 OverView ===
57.8	69
60.12	70
1.5	71	(((
60.4	72	(% style="color:red" %)Note：The specifications of each energy meter are different, please refer to your own energy meter specifications.
1.5	73	)))
1.2	74
1.5	75	(((
1.2	76	This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
1.5	77	)))
1.2	78
13.2	79	[[image:image-20220527092419-5.png]]
1.2	80
60.12	81	Connection1
1.2	82
13.2	83
1.19	84	(((
57.16	85	(% style="color:blue" %)How to connect with Energy Meter：
57.8	86
	87
1.19	88	)))
1.2	89
1.19	90	(((
1.2	91	Follow the instructions of the electric energy meter to connect the phase line and the neutral line, and then connect 485A+ and 485B- to RS485A and RA485B of RS485-LN respectively.
1.19	92	)))
1.2	93
1.19	94	(((
1.2	95	The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
1.19	96	)))
1.2	97
1.19	98	(((
60.13	99	Power Source VIN to RS485-LN VIN+
1.19	100	)))
1.2	101
1.19	102	(((
60.13	103	Power Source GND to RS485-LN VIN-
1.19	104	)))
1.2	105
1.19	106	(((
1.2	107	Once there is power, the RS485-LN will be on.
1.19	108	)))
1.2	109
13.2	110	[[image:image-20220527092514-6.png]]
1.2	111
60.12	112	Connection2
1.2	113
	114
20.2	115	[[image:image-20220527092555-7.png]]
1.12	116
60.12	117	Connection3
1.2	118
	119
60.12	120	=== 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
57.21	121
1.2	122
1.7	123	If the user needs to read the parameters of the electric energy meter and use the modbus command,please refer to the appendix of the MODBUS communication protocol in the user manual of the energy meter.
1.2	124
51.2	125	[[image:image-20220601143257-10.png]]
1.2	126
20.2	127
57.8	128	(% style="color:blue" %)Example:(%%) AT+COMMAND1=01 03 00 00 00 01 84 0A
1.2	129
	130	* The first byte : slave address code (=001～247)
60.13	131
1.2	132	* The second byte : read register value function code
60.13	133
1.2	134	* 3rd and 4th bytes: start address of register to be read
60.13	135
1.2	136	* 5th and 6th bytes: Number of registers to read
60.13	137
1.2	138	* 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
	139
1.12	140	(((
57.8	141
	142
	143
1.2	144	How to parse the reading of the return command of the parameter：
	145
57.8	146	(% style="color:blue" %)Example:(%%) RETURN1：01 03 02 08 FD 7E 05
1.8	147	)))
1.2	148
	149	* The first byte ARD: slave address code (=001～254)
60.13	150
1.2	151	* The second byte: Return to read function code
60.13	152
1.2	153	* 3rd byte: total number of bytes
60.13	154
1.2	155	* 4th～5th bytes: register data
60.13	156
1.2	157	* The 6th and 7th bytes: CRC16 checksum
60.13	158
1.2	159	* 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
	160
62.2	161
	162
60.12	163	=== 1.3.3 How to configure RS485-LN and parse output commands ===
1.2	164
57.8	165
1.2	166	RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
	167
20.2	168
60.13	169	==== 1.3.3.1 via AT COMMAND ====
57.21	170
1.2	171
57.8	172	First, we can use (% style="color:blue" %)AT+CFGDEV(%%) to get the return value, and we can also judge whether the input parameters are correct.
	173
1.8	174	(((
1.2	175	If the configured parameters and commands are incorrect, the return value is not obtained.
60.6	176
	177
1.8	178	)))
1.2	179
50.2	180	[[image:image-20220601143201-9.png]]
1.2	181
60.12	182	AT COMMAND
1.2	183
20.2	184
1.8	185	(% class="box infomessage" %)
	186	(((
60.1	187	(% _mstmutation="1" %)AT+DATACUTx (%%): This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
1.8	188	)))
1.2	189
41.15	190	a: length for the return of AT+COMMAND
1.2	191
41.15	192	b: 1: grab valid value by byte, max 6 bytes; 2: grab valid value by bytes section, max 3 sections.
1.2	193
41.15	194	c: define the position for valid value.
1.2	195
50.2	196	[[image:image-20220601143115-8.png]]
1.2	197
60.12	198	AT COMMAND
1.2	199
20.2	200
1.2	201	PAYLOAD is available after the valid value is intercepted.
	202
48.2	203	[[image:image-20220601143046-7.png]]
1.2	204
60.12	205	AT COMMAND
1.2	206
20.2	207
1.2	208	You can get configured PAYLOAD on TTN.
	209
52.2	210	[[image:image-20220601143519-1.png]]
1.8	211
1.12	212	(((
60.12	213	AT COMMAND
1.12	214	)))
1.2	215
1.12	216	(((
1.13	217
	218	)))
	219
	220	(((
57.8	221	(% style="color:blue" %)Example:
39.3	222
57.18	223	(% style="color:red" %)CMD1:(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
1.12	224	)))
1.2	225
1.12	226	(((
57.8	227	RETURN1: 01 03 02 00 02 39 85 00 00(return data)
1.12	228	)))
1.2	229
1.12	230	(((
57.8	231	AT+DATACUT1: 9,1,4+5+6+7 Take the return value 00 02 39 85 as the valid value of reading current data and used to splice payload.
39.3	232
	233
1.12	234	)))
1.2	235
1.12	236	(((
57.18	237	(% style="color:red" %)CMD2: (%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
1.12	238	)))
1.2	239
1.12	240	(((
57.8	241	RETURN2: 01 03 02 08 DC BE 1D(return data)
1.12	242	)))
1.2	243
1.12	244	(((
57.8	245	AT+DATACUT2: 7,1,4+5 Take the return value 08 DC as the valid value of reading voltage data and used to splice payload.
39.3	246
	247
1.12	248	)))
1.2	249
1.12	250	(((
57.18	251	(% style="color:red" %)CMD3:(%%) Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
1.12	252	)))
1.2	253
1.12	254	(((
57.9	255	RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
1.12	256	)))
1.2	257
1.12	258	(((
57.8	259	AT+DATACUT3: 9,1,4+5+6+7 Take the return value 00 00 00 44 as the valid value of reading total active energy data and used to splice payload.
1.12	260	)))
1.2	261
1.12	262	(((
57.8	263	Payload: 01 00 02 39 85 08 DC 00 00 00 44
1.12	264	)))
1.2	265
47.2	266	[[image:image-20220601142936-6.png]]
1.2	267
	268	AT COMMAND
	269
20.2	270
60.6	271	(% style="color:blue" %)01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.
1.2	272
41.17	273
53.2	274	[[image:image-20220601143642-2.png]]
1.8	275
1.2	276	AT COMMAND
	277
	278
60.13	279	==== 1.3.3.2 via LoRaWAN DOWNLINK ====
1.8	280
57.8	281
21.2	282	[[image:image-20220527093358-15.png]]
1.2	283
1.9	284	(((
60.12	285	DOWNLINK
1.9	286	)))
1.2	287
1.9	288
	289	(((
60.7	290	(% style="color:blue" %)Type Code 0xAF
1.9	291	)))
1.2	292
1.9	293	(((
4.3	294	(% class="box infomessage" %)
	295	(((
1.2	296	0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
1.9	297	)))
4.3	298	)))
1.2	299
1.9	300	(((
57.26	301	(% style="color:red" %)Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
1.9	302	)))
1.2	303
1.9	304	(((
1.2	305	Format: AF MM NN LL XX XX XX XX YY
1.9	306	)))
1.2	307
1.9	308	(((
1.2	309	Where:
1.9	310	)))
1.2	311
1.9	312	(((
1.2	313	MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
1.9	314	)))
1.2	315
1.9	316	(((
1.2	317	NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
1.9	318	)))
1.2	319
1.9	320	(((
1.2	321	LL: The length of AT+COMMAND or AT+DATACUT command
1.9	322	)))
1.2	323
1.9	324	(((
1.2	325	XX XX XX XX: AT+COMMAND or AT+DATACUT command
1.9	326	)))
1.2	327
1.9	328	(((
1.2	329	YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
1.9	330	)))
1.2	331
1.9	332	(((
1.2	333	will execute an uplink after got this command.
1.9	334	)))
1.2	335
60.13	336
1.9	337	(((
57.11	338	(% style="color:blue" %)Example:
1.9	339	)))
1.2	340
1.9	341	(((
39.4	342	AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
1.9	343	)))
1.2	344
57.2	345	[[image:image-20220601144149-6.png]]
1.2	346
60.12	347	DOWNLINK
1.2	348
1.8	349
54.2	350	[[image:image-20220601143803-3.png]]
1.2	351
60.12	352	DOWNLINK
1.2	353
1.8	354
57.2	355	[[image:image-20220601144053-5.png]]
1.2	356
60.12	357	DOWNLINK
1.2	358
1.8	359
55.2	360	[[image:image-20220601143921-4.png]]
1.2	361
60.12	362	DOWNLINK
1.2	363
1.15	364
46.2	365	[[image:image-20220601142805-5.png]]
1.2	366
60.12	367	DOWNLINK
1.2	368
57.21	369
60.12	370	=== 1.3.4 How to configure and output commands for RS485 to USB ===
1.2	371
60.2	372
1.13	373	(((
1.2	374	This step is not necessary, it is just to show how to use a normal RS485 to USB adapter to connect to the meter to check the input and output. This can be used to test the connection and RS485 command of the meter without RS485-LN.
1.13	375	)))
1.2	376
1.13	377	(((
1.2	378	First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
1.13	379	)))
1.2	380
1.13	381	(((
1.2	382	Open the serial port debugging, set the send and receive to HEX.
1.13	383	)))
1.2	384
1.13	385	(((
1.2	386	Baud rate: 9600
1.13	387	)))
1.2	388
1.13	389	(((
1.2	390	check digit: Even
1.13	391	)))
1.2	392
27.2	393	[[image:image-20220527093708-21.png]]
1.2	394
60.12	395	USB
1.2	396
1.13	397
29.2	398	[[image:image-20220527093747-22.png]]
1.2	399
60.12	400	USB
1.2	401
1.13	402
41.24	403
1.13	404	(((
1.2	405	The configuration command is consistent with the AT command, input the hexadecimal command directly into the serial port, and the serial port will output the command.
1.13	406	)))
1.2	407
1.13	408	(((
57.11	409	(% style="color:blue" %)Example: (%%)input：01 03 00 31 00 02 95 c4
1.13	410	)))
1.2	411
1.13	412	(((
4.6	413	output：01 03 04 00 00 00 42 7A 02
57.11	414
	415
1.13	416	)))
1.2	417
29.2	418	[[image:image-20220527093821-23.png]]
1.2	419
60.12	420	USB
1.2	421
29.2	422
60.12	423	=== 1.3.5 How to configure multiple devices and modify device addresses ===
1.2	424
57.11	425
1.2	426	If users need to read the parameters of multiple energy meters, they need to modify the device address, because the default device address of each energy meter is 01.
	427
1.14	428	(((
1.15	429	(((
1.2	430	Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
1.14	431	)))
1.15	432	)))
1.2	433
42.2	434	[[image:image-20220601142044-1.png]]
1.2	435
30.2	436
57.11	437	(% style="color:blue" %)Example(%%): These two meters are examples of setting parameters and device addresses.
1.2	438
60.8	439
31.2	440	[[image:image-20220527093950-25.png]]
1.2	441
57.4	442
32.2	443	[[image:image-20220527094028-26.png]]
1.2	444
57.12	445
1.14	446	(((
1.16	447	(((
1.2	448	First of all, since the default device address of the energy meter is 01, the configuration of two energy meters will conflict, so we first connect an energy meter and configure the device address.
1.14	449	)))
1.16	450	)))
1.2	451
1.14	452	(((
1.16	453	(((
57.27	454	We can use (% style="color:blue" %)AT+CFGDEV(%%) to set the device address.
1.14	455	)))
1.16	456	)))
1.2	457
1.14	458	(((
1.16	459	(((
1.2	460	We modify the device address 01 of the first energy meter to 02.
1.14	461	)))
1.16	462	)))
1.2	463
43.2	464	[[image:image-20220601142354-2.png]]
1.2	465
57.12	466
35.2	467	(% class="box infomessage" %)
	468	(((
	469	AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
	470	)))
1.2	471
60.12	472	* 01: device adaress
1.2	473
60.12	474	* 10: function code
1.2	475
	476	* 00 61：Register address
	477
	478	* 00 01：Number of Registers
	479
	480	* 02：Number of bytes
	481
	482	* 00 02：Modified device address
	483
	484	* 1：Check code
	485
	486	The device address setting of the energy meter is complete.
	487
	488	Another energy meter is a single active energy meter with a floating-point format.
	489
	490	Its default device address is 01, and the following are the parameters for configuring two energy meters.
	491
44.2	492	[[image:image-20220601142452-3.png]]
1.2	493
	494
45.2	495	[[image:image-20220601142607-4.png]]
35.2	496
57.12	497
57.21	498	(% style="color:blue" %)PAYLOAD: 01 08 DF 43 62
1.2	499
	500	* 08 DF is the valid value of the meter with device address 02.
	501	* 43 62 is the valid value of the meter with device address 01.
	502
60.10	503	(% style="display:none" %) (%%)
60.8	504
	505
1.2	506	== 1.4 Example 4: Circuit Breaker Remote Open Close ==
	507
	508
57.12	509	This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to SCHNEIDER SMART and Monitor and control your cabinet remotely with no wires and with Dragino RS485-LN LoRaWAN technology.
	510
	511	The structure is like below:
	512
36.2	513	[[image:image-20220527094330-30.png]]
1.2	514
60.13	515	Connection
1.2	516
	517
60.1	518	* Configure Documen: [[Circuit Breaker Remote Open Close>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Circuit_Breaker_Remote_Open_Close/\|\|_mstmutation="1"]]
57.12	519
62.2	520
	521
1.2	522	== 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
	523
57.12	524
1.2	525	This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-BL to connect to SEM Three Energy Meter and send the data to mobile phone for remote minitor. The structure is like below:
	526
60.1	527	* Configure Document For RS485-BL: [[Connect to SEM Three>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/RS485-BL/Application_Note/&file=Dragino%20RS485BL%20and%20pickdata%20SEM%20Three%20v1.pdf\|\|_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
60.13	528
60.1	529	* Configure Document for RS485-LN: [[Connect to SEM Three>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/SEM_Three_Energy_Meter/&file=SEM%20three%20and%20Dragino%20RS485-LN%20v1.pdf\|\|_mstmutation="1"]]
1.2	530
62.2	531
	532
57.14	533	== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
1.2	534
57.13	535
1.2	536	This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to CEM C31 485-T1-MID and send the data for remote minitor. The structure is like below:
	537
60.1	538	* Configure Document For RS485-LN: [[CEM C31 485-T1-MID>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/ELECTRICAL%20CABINET/&file=ELECTRICAL%20CABINET%20READINGS.pdf\|\|_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
1.2	539
62.2	540
	541
57.14	542	== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
1.2	543
57.13	544
38.1	545	[[image:image-20220527094556-31.png]]
1.2	546
61.1	547
1.2	548	Network Structure
	549
61.1	550	* [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]
57.13	551
61.1	552
62.2	553
	554	== 1.8 Example 8: This sketch is supposed to test Dragino RS485-BL (Modbus master), using an Arduino UNO as a Modbus slave. ==
	555
	556
61.1	557	This sketch uses 4 registers: some of them can be set by Dragino with a command, another is used to store value from a DS18B20 temperature sensor, or a random generated number. All data is 16bit uint, but the sketch shows also how to represent booleans and negative numbers.
	558
	559	In the next days I will be adding more documentation, but I think it already explains users how to build their own modbus sensor to pair with Dragino RS485-BL.
	560
	561	This is released the code under GNU LGPL licence on Github:
	562
	563	[[https:~~/~~/github.com/zorbaproject/ArduinoModbusForDraginoRS485>>url:https://github.com/zorbaproject/ArduinoModbusForDraginoRS485]]
	564
	565

Wiki source code of Application Note : Communicate with Different Sensors ----- RS485-LN / RS485-BL

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