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

Version 61.1 by Bei Jinggeng on 2023/08/08 15:16

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
57.20	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
41.11	53
60.10	54	[[image:image-20220527092146-4.png\|\|height="507" width="906"]]
1.2	55
60.12	56	Connection
1.2	57
41.12	58
57.15	59	(% style="color:blue" %)Related documents:
	60
60.1	61	* 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	62
1.2	63	* [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
	64
57.15	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.
60.6	77
	78
1.5	79	)))
1.2	80
13.2	81	[[image:image-20220527092419-5.png]]
1.2	82
60.12	83	Connection1
1.2	84
13.2	85
41.13	86
1.19	87	(((
57.16	88	(% style="color:blue" %)How to connect with Energy Meter：
57.8	89
	90
1.19	91	)))
1.2	92
1.19	93	(((
1.2	94	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	95	)))
1.2	96
1.19	97	(((
1.2	98	The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
1.19	99	)))
1.2	100
1.19	101	(((
60.13	102	Power Source VIN to RS485-LN VIN+
1.19	103	)))
1.2	104
1.19	105	(((
60.13	106	Power Source GND to RS485-LN VIN-
1.19	107	)))
1.2	108
1.19	109	(((
1.2	110	Once there is power, the RS485-LN will be on.
60.2	111
	112
1.19	113	)))
1.2	114
13.2	115	[[image:image-20220527092514-6.png]]
1.2	116
60.12	117	Connection2
1.2	118
	119
60.2	120
20.2	121	[[image:image-20220527092555-7.png]]
1.12	122
60.12	123	Connection3
1.2	124
	125
60.12	126	=== 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
57.21	127
1.2	128
1.7	129	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	130
51.2	131	[[image:image-20220601143257-10.png]]
1.2	132
20.2	133
57.8	134	(% style="color:blue" %)Example:(%%) AT+COMMAND1=01 03 00 00 00 01 84 0A
1.2	135
	136	* The first byte : slave address code (=001～247)
60.13	137
1.2	138	* The second byte : read register value function code
60.13	139
1.2	140	* 3rd and 4th bytes: start address of register to be read
60.13	141
1.2	142	* 5th and 6th bytes: Number of registers to read
60.13	143
1.2	144	* 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
	145
1.12	146	(((
57.8	147
	148
	149
1.2	150	How to parse the reading of the return command of the parameter：
	151
57.8	152	(% style="color:blue" %)Example:(%%) RETURN1：01 03 02 08 FD 7E 05
1.8	153	)))
1.2	154
	155	* The first byte ARD: slave address code (=001～254)
60.13	156
1.2	157	* The second byte: Return to read function code
60.13	158
1.2	159	* 3rd byte: total number of bytes
60.13	160
1.2	161	* 4th～5th bytes: register data
60.13	162
1.2	163	* The 6th and 7th bytes: CRC16 checksum
60.13	164
1.2	165	* 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
	166
57.8	167
60.12	168	=== 1.3.3 How to configure RS485-LN and parse output commands ===
1.2	169
57.8	170
1.2	171	RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
	172
20.2	173
60.13	174	==== 1.3.3.1 via AT COMMAND ====
57.21	175
1.2	176
57.8	177	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.
	178
1.8	179	(((
1.2	180	If the configured parameters and commands are incorrect, the return value is not obtained.
60.6	181
	182
1.8	183	)))
1.2	184
50.2	185	[[image:image-20220601143201-9.png]]
1.2	186
60.12	187	AT COMMAND
1.2	188
20.2	189
1.8	190	(% class="box infomessage" %)
	191	(((
60.1	192	(% _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	193	)))
1.2	194
41.15	195	a: length for the return of AT+COMMAND
1.2	196
41.15	197	b: 1: grab valid value by byte, max 6 bytes; 2: grab valid value by bytes section, max 3 sections.
1.2	198
41.15	199	c: define the position for valid value.
1.2	200
50.2	201	[[image:image-20220601143115-8.png]]
1.2	202
60.12	203	AT COMMAND
1.2	204
20.2	205
41.15	206
1.2	207	PAYLOAD is available after the valid value is intercepted.
	208
48.2	209	[[image:image-20220601143046-7.png]]
1.2	210
60.12	211	AT COMMAND
1.2	212
20.2	213
41.16	214
1.2	215	You can get configured PAYLOAD on TTN.
	216
52.2	217	[[image:image-20220601143519-1.png]]
1.8	218
1.12	219	(((
60.12	220	AT COMMAND
1.12	221	)))
1.2	222
1.12	223	(((
1.13	224
	225	)))
	226
	227	(((
57.8	228	(% style="color:blue" %)Example:
39.3	229
57.18	230	(% style="color:red" %)CMD1:(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
1.12	231	)))
1.2	232
1.12	233	(((
57.8	234	RETURN1: 01 03 02 00 02 39 85 00 00(return data)
1.12	235	)))
1.2	236
1.12	237	(((
57.8	238	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	239
	240
1.12	241	)))
1.2	242
1.12	243	(((
57.18	244	(% style="color:red" %)CMD2: (%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
1.12	245	)))
1.2	246
1.12	247	(((
57.8	248	RETURN2: 01 03 02 08 DC BE 1D(return data)
1.12	249	)))
1.2	250
1.12	251	(((
57.8	252	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	253
	254
1.12	255	)))
1.2	256
1.12	257	(((
57.18	258	(% 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	259	)))
1.2	260
1.12	261	(((
57.9	262	RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
1.12	263	)))
1.2	264
1.12	265	(((
57.8	266	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	267	)))
1.2	268
1.12	269	(((
57.8	270	Payload: 01 00 02 39 85 08 DC 00 00 00 44
1.12	271	)))
1.2	272
47.2	273	[[image:image-20220601142936-6.png]]
1.2	274
	275	AT COMMAND
	276
20.2	277
60.2	278
60.6	279	(% 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	280
41.17	281
53.2	282	[[image:image-20220601143642-2.png]]
1.8	283
1.2	284	AT COMMAND
	285
	286
57.21	287
60.13	288	==== 1.3.3.2 via LoRaWAN DOWNLINK ====
1.8	289
57.8	290
21.2	291	[[image:image-20220527093358-15.png]]
1.2	292
1.9	293	(((
60.12	294	DOWNLINK
1.9	295	)))
1.2	296
1.9	297
60.13	298
1.9	299	(((
60.7	300	(% style="color:blue" %)Type Code 0xAF
1.9	301	)))
1.2	302
1.9	303	(((
4.3	304	(% class="box infomessage" %)
	305	(((
1.2	306	0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
1.9	307	)))
4.3	308	)))
1.2	309
1.9	310	(((
57.26	311	(% style="color:red" %)Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
1.9	312	)))
1.2	313
1.9	314	(((
1.2	315	Format: AF MM NN LL XX XX XX XX YY
1.9	316	)))
1.2	317
1.9	318	(((
1.2	319	Where:
1.9	320	)))
1.2	321
1.9	322	(((
1.2	323	MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
1.9	324	)))
1.2	325
1.9	326	(((
1.2	327	NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
1.9	328	)))
1.2	329
1.9	330	(((
1.2	331	LL: The length of AT+COMMAND or AT+DATACUT command
1.9	332	)))
1.2	333
1.9	334	(((
1.2	335	XX XX XX XX: AT+COMMAND or AT+DATACUT command
1.9	336	)))
1.2	337
1.9	338	(((
1.2	339	YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
1.9	340	)))
1.2	341
1.9	342	(((
1.2	343	will execute an uplink after got this command.
1.9	344	)))
1.2	345
60.13	346
1.9	347	(((
57.11	348	(% style="color:blue" %)Example:
1.9	349	)))
1.2	350
1.9	351	(((
39.4	352	AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
1.9	353	)))
1.2	354
57.2	355	[[image:image-20220601144149-6.png]]
1.2	356
60.12	357	DOWNLINK
1.2	358
1.8	359
41.19	360
54.2	361	[[image:image-20220601143803-3.png]]
1.2	362
60.12	363	DOWNLINK
1.2	364
1.8	365
41.20	366
57.2	367	[[image:image-20220601144053-5.png]]
1.2	368
60.12	369	DOWNLINK
1.2	370
1.8	371
41.21	372
55.2	373	[[image:image-20220601143921-4.png]]
1.2	374
60.12	375	DOWNLINK
1.2	376
1.15	377
41.22	378
46.2	379	[[image:image-20220601142805-5.png]]
1.2	380
60.12	381	DOWNLINK
1.2	382
57.21	383
60.12	384	=== 1.3.4 How to configure and output commands for RS485 to USB ===
1.2	385
60.2	386
1.13	387	(((
1.2	388	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	389	)))
1.2	390
1.13	391	(((
1.2	392	First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
1.13	393	)))
1.2	394
1.13	395	(((
1.2	396	Open the serial port debugging, set the send and receive to HEX.
1.13	397	)))
1.2	398
1.13	399	(((
1.2	400	Baud rate: 9600
1.13	401	)))
1.2	402
1.13	403	(((
1.2	404	check digit: Even
57.11	405
	406
1.13	407	)))
1.2	408
27.2	409	[[image:image-20220527093708-21.png]]
1.2	410
60.12	411	USB
1.2	412
1.13	413
41.23	414
29.2	415	[[image:image-20220527093747-22.png]]
1.2	416
60.12	417	USB
1.2	418
1.13	419
41.24	420
1.13	421	(((
1.2	422	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	423	)))
1.2	424
1.13	425	(((
57.11	426	(% style="color:blue" %)Example: (%%)input：01 03 00 31 00 02 95 c4
1.13	427	)))
1.2	428
1.13	429	(((
4.6	430	output：01 03 04 00 00 00 42 7A 02
57.11	431
	432
1.13	433	)))
1.2	434
29.2	435	[[image:image-20220527093821-23.png]]
1.2	436
60.12	437	USB
1.2	438
29.2	439
57.21	440
60.12	441	=== 1.3.5 How to configure multiple devices and modify device addresses ===
1.2	442
57.11	443
1.2	444	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.
	445
1.14	446	(((
1.15	447	(((
1.2	448	Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
1.14	449	)))
1.15	450	)))
1.2	451
42.2	452	[[image:image-20220601142044-1.png]]
1.2	453
30.2	454
57.11	455	(% style="color:blue" %)Example(%%): These two meters are examples of setting parameters and device addresses.
1.2	456
60.8	457
31.2	458	[[image:image-20220527093950-25.png]]
1.2	459
57.4	460
32.2	461	[[image:image-20220527094028-26.png]]
1.2	462
57.12	463
1.14	464	(((
1.16	465	(((
1.2	466	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	467	)))
1.16	468	)))
1.2	469
1.14	470	(((
1.16	471	(((
57.27	472	We can use (% style="color:blue" %)AT+CFGDEV(%%) to set the device address.
1.14	473	)))
1.16	474	)))
1.2	475
1.14	476	(((
1.16	477	(((
1.2	478	We modify the device address 01 of the first energy meter to 02.
1.14	479	)))
1.16	480	)))
1.2	481
43.2	482	[[image:image-20220601142354-2.png]]
1.2	483
57.12	484
35.2	485	(% class="box infomessage" %)
	486	(((
	487	AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
	488	)))
1.2	489
60.12	490	* 01: device adaress
1.2	491
60.12	492	* 10: function code
1.2	493
	494	* 00 61：Register address
	495
	496	* 00 01：Number of Registers
	497
	498	* 02：Number of bytes
	499
	500	* 00 02：Modified device address
	501
	502	* 1：Check code
	503
	504	The device address setting of the energy meter is complete.
	505
	506	Another energy meter is a single active energy meter with a floating-point format.
	507
	508	Its default device address is 01, and the following are the parameters for configuring two energy meters.
	509
44.2	510	[[image:image-20220601142452-3.png]]
1.2	511
	512
45.2	513	[[image:image-20220601142607-4.png]]
35.2	514
57.12	515
57.21	516	(% style="color:blue" %)PAYLOAD: 01 08 DF 43 62
1.2	517
	518	* 08 DF is the valid value of the meter with device address 02.
	519	* 43 62 is the valid value of the meter with device address 01.
	520
60.10	521	(% style="display:none" %) (%%)
60.8	522
	523
1.2	524	== 1.4 Example 4: Circuit Breaker Remote Open Close ==
	525
	526
57.12	527	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.
	528
	529	The structure is like below:
	530
36.2	531	[[image:image-20220527094330-30.png]]
1.2	532
60.13	533	Connection
1.2	534
	535
60.1	536	* 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	537
60.9	538
1.2	539	== 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
	540
57.12	541
1.2	542	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:
	543
60.1	544	* 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	545
60.1	546	* 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	547
60.9	548
57.14	549	== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
1.2	550
57.13	551
1.2	552	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:
	553
60.1	554	* 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	555
60.9	556
57.14	557	== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
1.2	558
57.13	559
38.1	560	[[image:image-20220527094556-31.png]]
1.2	561
61.1	562
1.2	563	Network Structure
	564
61.1	565	* [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]
57.13	566
61.1	567	== ==
	568
	569	== 1.8 Example 8: This sketch is supposed to test Dragino RS485-BL (Modbus master), using an Arduino UNO as a Modbus slave. ==
	570
	571	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.
	572
	573	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.
	574
	575	This is released the code under GNU LGPL licence on Github:
	576
	577	[[https:~~/~~/github.com/zorbaproject/ArduinoModbusForDraginoRS485>>url:https://github.com/zorbaproject/ArduinoModbusForDraginoRS485]]
	578
	579

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

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