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

Last modified by Bei Jinggeng on 2023/08/08 15:23

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
1.1	27
10.2	28	[[image:image-20220527091942-2.png]](% style="display:none" %)
	29
60.12	30	Connection
1.1	31
10.2	32
57.15	33	(% style="color:blue" %)Related documents:
1.1	34
60.13	35	* 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);"]]
	36
60.1	37	* 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	38
1.2	39	* [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
1.1	40
60.12	41	== 1.2 Example 2: Connect to Pulse Counter ==
1.1	42
57.7	43
1.2	44	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	45
57.7	46
60.10	47	[[image:image-20220527092058-3.png\|\|height="552" width="905"]]
1.1	48
60.12	49	Connection
1.1	50
1.18	51
41.11	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
60.12	64	== 1.3 Example 3: Use RS485-LN with energy meters ==
1.2	65
60.12	66	=== 1.3.1 OverView ===
57.8	67
60.12	68
1.5	69	(((
60.4	70	(% style="color:red" %)Note：The specifications of each energy meter are different, please refer to your own energy meter specifications.
1.5	71	)))
1.2	72
1.5	73	(((
1.2	74	This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
60.6	75
	76
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
41.13	84
1.19	85	(((
57.16	86	(% style="color:blue" %)How to connect with Energy Meter：
57.8	87
	88
1.19	89	)))
1.2	90
1.19	91	(((
1.2	92	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	93	)))
1.2	94
1.19	95	(((
1.2	96	The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
1.19	97	)))
1.2	98
1.19	99	(((
60.13	100	Power Source VIN to RS485-LN VIN+
1.19	101	)))
1.2	102
1.19	103	(((
60.13	104	Power Source GND to RS485-LN VIN-
1.19	105	)))
1.2	106
1.19	107	(((
1.2	108	Once there is power, the RS485-LN will be on.
60.2	109
	110
1.19	111	)))
1.2	112
13.2	113	[[image:image-20220527092514-6.png]]
1.2	114
60.12	115	Connection2
1.2	116
	117
60.2	118
20.2	119	[[image:image-20220527092555-7.png]]
1.12	120
60.12	121	Connection3
1.2	122
	123
60.12	124	=== 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
57.21	125
1.2	126
1.7	127	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	128
51.2	129	[[image:image-20220601143257-10.png]]
1.2	130
20.2	131
57.8	132	(% style="color:blue" %)Example:(%%) AT+COMMAND1=01 03 00 00 00 01 84 0A
1.2	133
	134	* The first byte : slave address code (=001～247)
60.13	135
1.2	136	* The second byte : read register value function code
60.13	137
1.2	138	* 3rd and 4th bytes: start address of register to be read
60.13	139
1.2	140	* 5th and 6th bytes: Number of registers to read
60.13	141
1.2	142	* 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
	143
1.12	144	(((
57.8	145
	146
	147
1.2	148	How to parse the reading of the return command of the parameter：
	149
57.8	150	(% style="color:blue" %)Example:(%%) RETURN1：01 03 02 08 FD 7E 05
1.8	151	)))
1.2	152
	153	* The first byte ARD: slave address code (=001～254)
60.13	154
1.2	155	* The second byte: Return to read function code
60.13	156
1.2	157	* 3rd byte: total number of bytes
60.13	158
1.2	159	* 4th～5th bytes: register data
60.13	160
1.2	161	* The 6th and 7th bytes: CRC16 checksum
60.13	162
1.2	163	* 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
	164
60.12	165	=== 1.3.3 How to configure RS485-LN and parse output commands ===
1.2	166
57.8	167
1.2	168	RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
	169
20.2	170
60.13	171	==== 1.3.3.1 via AT COMMAND ====
57.21	172
1.2	173
57.8	174	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.
	175
1.8	176	(((
1.2	177	If the configured parameters and commands are incorrect, the return value is not obtained.
60.6	178
	179
1.8	180	)))
1.2	181
50.2	182	[[image:image-20220601143201-9.png]]
1.2	183
60.12	184	AT COMMAND
1.2	185
20.2	186
1.8	187	(% class="box infomessage" %)
	188	(((
60.1	189	(% _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	190	)))
1.2	191
41.15	192	a: length for the return of AT+COMMAND
1.2	193
41.15	194	b: 1: grab valid value by byte, max 6 bytes; 2: grab valid value by bytes section, max 3 sections.
1.2	195
41.15	196	c: define the position for valid value.
1.2	197
50.2	198	[[image:image-20220601143115-8.png]]
1.2	199
60.12	200	AT COMMAND
1.2	201
20.2	202
41.15	203
1.2	204	PAYLOAD is available after the valid value is intercepted.
	205
48.2	206	[[image:image-20220601143046-7.png]]
1.2	207
60.12	208	AT COMMAND
1.2	209
20.2	210
41.16	211
1.2	212	You can get configured PAYLOAD on TTN.
	213
52.2	214	[[image:image-20220601143519-1.png]]
1.8	215
1.12	216	(((
60.12	217	AT COMMAND
1.12	218	)))
1.2	219
1.12	220	(((
1.13	221
	222	)))
	223
	224	(((
57.8	225	(% style="color:blue" %)Example:
39.3	226
57.18	227	(% style="color:red" %)CMD1:(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
1.12	228	)))
1.2	229
1.12	230	(((
57.8	231	RETURN1: 01 03 02 00 02 39 85 00 00(return data)
1.12	232	)))
1.2	233
1.12	234	(((
57.8	235	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	236
	237
1.12	238	)))
1.2	239
1.12	240	(((
57.18	241	(% style="color:red" %)CMD2: (%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
1.12	242	)))
1.2	243
1.12	244	(((
57.8	245	RETURN2: 01 03 02 08 DC BE 1D(return data)
1.12	246	)))
1.2	247
1.12	248	(((
57.8	249	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	250
	251
1.12	252	)))
1.2	253
1.12	254	(((
57.18	255	(% 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	256	)))
1.2	257
1.12	258	(((
57.9	259	RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
1.12	260	)))
1.2	261
1.12	262	(((
57.8	263	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	264	)))
1.2	265
1.12	266	(((
57.8	267	Payload: 01 00 02 39 85 08 DC 00 00 00 44
1.12	268	)))
1.2	269
47.2	270	[[image:image-20220601142936-6.png]]
1.2	271
	272	AT COMMAND
	273
20.2	274
60.2	275
60.6	276	(% 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	277
41.17	278
53.2	279	[[image:image-20220601143642-2.png]]
1.8	280
1.2	281	AT COMMAND
	282
	283
57.21	284
60.13	285	==== 1.3.3.2 via LoRaWAN DOWNLINK ====
1.8	286
57.8	287
21.2	288	[[image:image-20220527093358-15.png]]
1.2	289
1.9	290	(((
60.12	291	DOWNLINK
1.9	292	)))
1.2	293
1.9	294
60.13	295
1.9	296	(((
60.7	297	(% style="color:blue" %)Type Code 0xAF
1.9	298	)))
1.2	299
1.9	300	(((
4.3	301	(% class="box infomessage" %)
	302	(((
1.2	303	0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
1.9	304	)))
4.3	305	)))
1.2	306
1.9	307	(((
57.26	308	(% style="color:red" %)Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
1.9	309	)))
1.2	310
1.9	311	(((
1.2	312	Format: AF MM NN LL XX XX XX XX YY
1.9	313	)))
1.2	314
1.9	315	(((
1.2	316	Where:
1.9	317	)))
1.2	318
1.9	319	(((
1.2	320	MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
1.9	321	)))
1.2	322
1.9	323	(((
1.2	324	NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
1.9	325	)))
1.2	326
1.9	327	(((
1.2	328	LL: The length of AT+COMMAND or AT+DATACUT command
1.9	329	)))
1.2	330
1.9	331	(((
1.2	332	XX XX XX XX: AT+COMMAND or AT+DATACUT command
1.9	333	)))
1.2	334
1.9	335	(((
1.2	336	YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
1.9	337	)))
1.2	338
1.9	339	(((
1.2	340	will execute an uplink after got this command.
1.9	341	)))
1.2	342
60.13	343
1.9	344	(((
57.11	345	(% style="color:blue" %)Example:
1.9	346	)))
1.2	347
1.9	348	(((
39.4	349	AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
1.9	350	)))
1.2	351
57.2	352	[[image:image-20220601144149-6.png]]
1.2	353
60.12	354	DOWNLINK
1.2	355
1.8	356
41.19	357
54.2	358	[[image:image-20220601143803-3.png]]
1.2	359
60.12	360	DOWNLINK
1.2	361
1.8	362
41.20	363
57.2	364	[[image:image-20220601144053-5.png]]
1.2	365
60.12	366	DOWNLINK
1.2	367
1.8	368
41.21	369
55.2	370	[[image:image-20220601143921-4.png]]
1.2	371
60.12	372	DOWNLINK
1.2	373
1.15	374
41.22	375
46.2	376	[[image:image-20220601142805-5.png]]
1.2	377
60.12	378	DOWNLINK
1.2	379
57.21	380
60.12	381	=== 1.3.4 How to configure and output commands for RS485 to USB ===
1.2	382
60.2	383
1.13	384	(((
1.2	385	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	386	)))
1.2	387
1.13	388	(((
1.2	389	First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
1.13	390	)))
1.2	391
1.13	392	(((
1.2	393	Open the serial port debugging, set the send and receive to HEX.
1.13	394	)))
1.2	395
1.13	396	(((
1.2	397	Baud rate: 9600
1.13	398	)))
1.2	399
1.13	400	(((
1.2	401	check digit: Even
57.11	402
	403
1.13	404	)))
1.2	405
27.2	406	[[image:image-20220527093708-21.png]]
1.2	407
60.12	408	USB
1.2	409
1.13	410
41.23	411
29.2	412	[[image:image-20220527093747-22.png]]
1.2	413
60.12	414	USB
1.2	415
1.13	416
41.24	417
1.13	418	(((
1.2	419	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	420	)))
1.2	421
1.13	422	(((
57.11	423	(% style="color:blue" %)Example: (%%)input：01 03 00 31 00 02 95 c4
1.13	424	)))
1.2	425
1.13	426	(((
4.6	427	output：01 03 04 00 00 00 42 7A 02
57.11	428
	429
1.13	430	)))
1.2	431
29.2	432	[[image:image-20220527093821-23.png]]
1.2	433
60.12	434	USB
1.2	435
29.2	436
57.21	437
60.12	438	=== 1.3.5 How to configure multiple devices and modify device addresses ===
1.2	439
57.11	440
1.2	441	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.
	442
1.14	443	(((
1.15	444	(((
1.2	445	Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
1.14	446	)))
1.15	447	)))
1.2	448
42.2	449	[[image:image-20220601142044-1.png]]
1.2	450
30.2	451
57.11	452	(% style="color:blue" %)Example(%%): These two meters are examples of setting parameters and device addresses.
1.2	453
60.8	454
31.2	455	[[image:image-20220527093950-25.png]]
1.2	456
57.4	457
32.2	458	[[image:image-20220527094028-26.png]]
1.2	459
57.12	460
1.14	461	(((
1.16	462	(((
1.2	463	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	464	)))
1.16	465	)))
1.2	466
1.14	467	(((
1.16	468	(((
57.27	469	We can use (% style="color:blue" %)AT+CFGDEV(%%) to set the device address.
1.14	470	)))
1.16	471	)))
1.2	472
1.14	473	(((
1.16	474	(((
1.2	475	We modify the device address 01 of the first energy meter to 02.
1.14	476	)))
1.16	477	)))
1.2	478
43.2	479	[[image:image-20220601142354-2.png]]
1.2	480
57.12	481
35.2	482	(% class="box infomessage" %)
	483	(((
	484	AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
	485	)))
1.2	486
60.12	487	* 01: device adaress
1.2	488
60.12	489	* 10: function code
1.2	490
	491	* 00 61：Register address
	492
	493	* 00 01：Number of Registers
	494
	495	* 02：Number of bytes
	496
	497	* 00 02：Modified device address
	498
	499	* 1：Check code
	500
	501	The device address setting of the energy meter is complete.
	502
	503	Another energy meter is a single active energy meter with a floating-point format.
	504
	505	Its default device address is 01, and the following are the parameters for configuring two energy meters.
	506
44.2	507	[[image:image-20220601142452-3.png]]
1.2	508
	509
45.2	510	[[image:image-20220601142607-4.png]]
35.2	511
57.12	512
57.21	513	(% style="color:blue" %)PAYLOAD: 01 08 DF 43 62
1.2	514
	515	* 08 DF is the valid value of the meter with device address 02.
	516	* 43 62 is the valid value of the meter with device address 01.
	517
60.10	518	(% style="display:none" %) (%%)
60.8	519
	520
1.2	521	== 1.4 Example 4: Circuit Breaker Remote Open Close ==
	522
	523
57.12	524	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.
	525
	526	The structure is like below:
	527
36.2	528	[[image:image-20220527094330-30.png]]
1.2	529
60.13	530	Connection
1.2	531
	532
60.1	533	* 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	534
1.2	535	== 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
	536
57.12	537
1.2	538	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:
	539
60.1	540	* 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	541
60.1	542	* 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	543
57.14	544	== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
1.2	545
57.13	546
1.2	547	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:
	548
60.1	549	* 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	550
57.14	551	== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
1.2	552
57.13	553
38.1	554	[[image:image-20220527094556-31.png]]
1.2	555
61.1	556
1.2	557	Network Structure
	558
61.1	559	* [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]
57.13	560
61.1	561	== 1.8 Example 8: This sketch is supposed to test Dragino RS485-BL (Modbus master), using an Arduino UNO as a Modbus slave. ==
	562
	563	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.
	564
	565	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.
	566
	567	This is released the code under GNU LGPL licence on Github:
	568
	569	[[https:~~/~~/github.com/zorbaproject/ArduinoModbusForDraginoRS485>>url:https://github.com/zorbaproject/ArduinoModbusForDraginoRS485]]
	570
	571

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

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