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

Version 57.19 by Xiaoling on 2022/07/14 10:09

version	line-number	content
57.14	1	Table of Contents:
6.2	2
	3	{{toc/}}
	4
41.2	5
	6
	7
	8
	9
41.7	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
41.7	16	== 1.1 Example 1: Connect to Leak relay and VFD ==
1.1	17
57.6	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
10.2	21	[[image:image-20220527091852-1.png]]
1.1	22
1.2	23	Connection
1.1	24
1.18	25
1.1	26
10.2	27	[[image:image-20220527091942-2.png]](% style="display:none" %)
	28
1.2	29	Connection
1.1	30
10.2	31
57.15	32	(% style="color:blue" %)Related documents:
1.1	33
57.15	34	* System Structure: [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/\|\|style="background-color: rgb(255, 255, 255);"]]
	35	* 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/\|\|style="background-color: rgb(255, 255, 255);"]]
1.2	36	* [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
1.1	37
41.7	38	== 1.2 Example 2: Connect to Pulse Counter ==
1.1	39
57.7	40
1.2	41	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	42
57.7	43
10.2	44	[[image:image-20220527092058-3.png]]
1.1	45
1.2	46	Connection
1.1	47
1.18	48
41.11	49
10.2	50	[[image:image-20220527092146-4.png]]
1.2	51
	52	Connection
	53
41.12	54
57.15	55	(% style="color:blue" %)Related documents:
	56
	57	* 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/]]
1.2	58	* [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
	59
57.15	60
57.19	61
41.7	62	== 1.3 Example3: Use RS485-LN with energy meters ==
1.2	63
57.16	64
41.7	65	=== 1.3.1 OverView ===
1.2	66
57.8	67
1.5	68	(((
57.8	69	(% style="color:red" %)Note：The specifications of each energy meter are different, please refer to your own energy meter specifications.
1.5	70	)))
1.2	71
1.5	72	(((
1.2	73	This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
1.5	74	)))
1.2	75
13.2	76	[[image:image-20220527092419-5.png]]
1.2	77
	78	Connection1
	79
13.2	80
41.13	81
1.19	82	(((
57.16	83	(% style="color:blue" %)How to connect with Energy Meter：
57.8	84
	85
1.19	86	)))
1.2	87
1.19	88	(((
1.2	89	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	90	)))
1.2	91
1.19	92	(((
1.2	93	The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
1.19	94	)))
1.2	95
1.19	96	(((
1.2	97	Power Source VIN to RS485-LN VIN+
1.19	98	)))
1.2	99
1.19	100	(((
1.2	101	Power Source GND to RS485-LN VIN-
1.19	102	)))
1.2	103
1.19	104	(((
1.2	105	Once there is power, the RS485-LN will be on.
1.19	106	)))
1.2	107
13.2	108	[[image:image-20220527092514-6.png]]
1.2	109
	110	Connection2
	111
	112
20.2	113	[[image:image-20220527092555-7.png]]
1.12	114
1.2	115	Connection3
	116
	117
41.7	118	=== 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
1.2	119
57.8	120
1.7	121	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	122
51.2	123	[[image:image-20220601143257-10.png]]
1.2	124
20.2	125
57.8	126	(% style="color:blue" %)Example:(%%) AT+COMMAND1=01 03 00 00 00 01 84 0A
1.2	127
	128	* The first byte : slave address code (=001～247)
	129	* The second byte : read register value function code
	130	* 3rd and 4th bytes: start address of register to be read
	131	* 5th and 6th bytes: Number of registers to read
	132	* 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
	133
1.12	134	(((
57.8	135
	136
	137
1.2	138	How to parse the reading of the return command of the parameter：
	139
57.8	140	(% style="color:blue" %)Example:(%%) RETURN1：01 03 02 08 FD 7E 05
1.8	141	)))
1.2	142
	143	* The first byte ARD: slave address code (=001～254)
	144	* The second byte: Return to read function code
	145	* 3rd byte: total number of bytes
	146	* 4th～5th bytes: register data
	147	* The 6th and 7th bytes: CRC16 checksum
	148	* 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
	149
20.2	150	(% class="wikigeneratedid" %)
	151	(((
	152
57.8	153
	154
	155
20.2	156	)))
	157
41.2	158	=== 1.3.3 How to configure RS485-LN and parse output commands ===
1.2	159
57.8	160
1.2	161	RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
	162
20.2	163
57.8	164	==== 1.3.3.1 via AT COMMAND ====
1.2	165
	166
57.8	167	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.
	168
1.8	169	(((
1.2	170	If the configured parameters and commands are incorrect, the return value is not obtained.
1.8	171	)))
1.2	172
50.2	173	[[image:image-20220601143201-9.png]]
1.2	174
1.12	175	AT COMMAND
1.2	176
20.2	177
1.8	178	(% class="box infomessage" %)
	179	(((
57.8	180	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	181	)))
1.2	182
41.15	183	a: length for the return of AT+COMMAND
1.2	184
41.15	185	b: 1: grab valid value by byte, max 6 bytes; 2: grab valid value by bytes section, max 3 sections.
1.2	186
41.15	187	c: define the position for valid value.
1.2	188
50.2	189	[[image:image-20220601143115-8.png]]
1.2	190
	191	AT COMMAND
	192
20.2	193
41.15	194
1.2	195	PAYLOAD is available after the valid value is intercepted.
	196
1.8	197
48.2	198	[[image:image-20220601143046-7.png]]
1.2	199
	200	AT COMMAND
	201
20.2	202
41.16	203
1.2	204	You can get configured PAYLOAD on TTN.
	205
52.2	206	[[image:image-20220601143519-1.png]]
1.8	207
1.12	208	(((
1.2	209	AT COMMAND
1.12	210	)))
1.2	211
1.12	212	(((
1.13	213
	214	)))
	215
	216	(((
57.8	217	(% style="color:blue" %)Example:
39.3	218
57.18	219	(% style="color:red" %)CMD1:(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
1.12	220	)))
1.2	221
1.12	222	(((
57.8	223	RETURN1: 01 03 02 00 02 39 85 00 00(return data)
1.12	224	)))
1.2	225
1.12	226	(((
57.8	227	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	228
	229
1.12	230	)))
1.2	231
1.12	232	(((
57.18	233	(% style="color:red" %)CMD2: (%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
1.12	234	)))
1.2	235
1.12	236	(((
57.8	237	RETURN2: 01 03 02 08 DC BE 1D(return data)
1.12	238	)))
1.2	239
1.12	240	(((
57.8	241	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	242
	243
1.12	244	)))
1.2	245
1.12	246	(((
57.18	247	(% 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	248	)))
1.2	249
1.12	250	(((
57.9	251	RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
1.12	252	)))
1.2	253
1.12	254	(((
57.8	255	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	256	)))
1.2	257
1.12	258	(((
57.8	259	Payload: 01 00 02 39 85 08 DC 00 00 00 44
1.12	260	)))
1.2	261
47.2	262	[[image:image-20220601142936-6.png]]
1.2	263
	264	AT COMMAND
	265
20.2	266
21.2	267	(% style="color:#4f81bd" %)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	268
41.17	269
53.2	270	[[image:image-20220601143642-2.png]]
1.8	271
1.2	272	AT COMMAND
	273
	274
41.2	275	==== 1.3.3.2 via LoRaWAN DOWNLINK ====
1.8	276
57.8	277
21.2	278	[[image:image-20220527093358-15.png]]
1.2	279
1.9	280	(((
1.2	281	DOWNLINK
1.9	282	)))
1.2	283
1.9	284	(((
	285
	286	)))
	287
	288	(((
39.4	289	(% style="color:#4f81bd" %)Type Code 0xAF
1.9	290	)))
1.2	291
1.9	292	(((
4.3	293	(% class="box infomessage" %)
	294	(((
1.2	295	0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
1.9	296	)))
4.3	297	)))
1.2	298
1.9	299	(((
57.11	300	(% style="color:red" %)Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
1.9	301	)))
1.2	302
1.9	303	(((
1.2	304	Format: AF MM NN LL XX XX XX XX YY
1.9	305	)))
1.2	306
1.9	307	(((
1.2	308	Where:
1.9	309	)))
1.2	310
1.9	311	(((
1.2	312	MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
1.9	313	)))
1.2	314
1.9	315	(((
1.2	316	NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
1.9	317	)))
1.2	318
1.9	319	(((
1.2	320	LL: The length of AT+COMMAND or AT+DATACUT command
1.9	321	)))
1.2	322
1.9	323	(((
1.2	324	XX XX XX XX: AT+COMMAND or AT+DATACUT command
1.9	325	)))
1.2	326
1.9	327	(((
1.2	328	YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
1.9	329	)))
1.2	330
1.9	331	(((
1.2	332	will execute an uplink after got this command.
1.9	333	)))
1.2	334
1.9	335	(((
41.18	336
	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
	347	DOWNLINK
	348
1.8	349
41.19	350
54.2	351	[[image:image-20220601143803-3.png]]
1.2	352
	353	DOWNLINK
	354
1.8	355
41.20	356
57.2	357	[[image:image-20220601144053-5.png]]
1.2	358
	359	DOWNLINK
	360
1.8	361
41.21	362
55.2	363	[[image:image-20220601143921-4.png]]
1.2	364
	365	DOWNLINK
	366
1.15	367
41.22	368
46.2	369	[[image:image-20220601142805-5.png]]
1.2	370
	371	DOWNLINK
	372
	373
41.2	374	=== 1.3.4 How to configure and output commands for RS485 to USB ===
1.2	375
1.13	376	(((
1.2	377	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	378	)))
1.2	379
1.13	380	(((
1.2	381	First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
1.13	382	)))
1.2	383
1.13	384	(((
1.2	385	Open the serial port debugging, set the send and receive to HEX.
1.13	386	)))
1.2	387
1.13	388	(((
1.2	389	Baud rate: 9600
1.13	390	)))
1.2	391
1.13	392	(((
1.2	393	check digit: Even
57.11	394
	395
1.13	396	)))
1.2	397
27.2	398	[[image:image-20220527093708-21.png]]
1.2	399
	400	USB
	401
1.13	402
41.23	403
29.2	404	[[image:image-20220527093747-22.png]]
1.2	405
	406	USB
	407
1.13	408
41.24	409
1.13	410	(((
1.2	411	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.
57.11	412
	413
1.13	414	)))
1.2	415
1.13	416	(((
57.11	417	(% style="color:blue" %)Example: (%%)input：01 03 00 31 00 02 95 c4
1.13	418	)))
1.2	419
1.13	420	(((
4.6	421	output：01 03 04 00 00 00 42 7A 02
57.11	422
	423
1.13	424	)))
1.2	425
29.2	426	[[image:image-20220527093821-23.png]]
1.2	427
	428	USB
	429
29.2	430
41.2	431	=== 1.3.5 How to configure multiple devices and modify device addresses ===
1.2	432
57.11	433
1.2	434	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.
	435
1.14	436	(((
1.15	437	(((
1.2	438	Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
1.14	439	)))
1.15	440	)))
1.2	441
42.2	442	[[image:image-20220601142044-1.png]]
1.2	443
30.2	444
57.11	445	(% style="color:blue" %)Example(%%): These two meters are examples of setting parameters and device addresses.
1.2	446
31.2	447	[[image:image-20220527093950-25.png]]
1.2	448
57.4	449
32.2	450	[[image:image-20220527094028-26.png]]
1.2	451
57.12	452
1.14	453	(((
1.16	454	(((
1.2	455	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	456	)))
1.16	457	)))
1.2	458
1.14	459	(((
1.16	460	(((
57.12	461	We can use AT+CFGDEV to set the device address.
1.14	462	)))
1.16	463	)))
1.2	464
1.14	465	(((
1.16	466	(((
1.2	467	We modify the device address 01 of the first energy meter to 02.
1.14	468	)))
1.16	469	)))
1.2	470
43.2	471	[[image:image-20220601142354-2.png]]
1.2	472
57.12	473
35.2	474	(% class="box infomessage" %)
	475	(((
	476	AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
	477	)))
1.2	478
	479	* 01:device adaress
	480
	481	* 10:function code
	482
	483	* 00 61：Register address
	484
	485	* 00 01：Number of Registers
	486
	487	* 02：Number of bytes
	488
	489	* 00 02：Modified device address
	490
	491	* 1：Check code
	492
	493	The device address setting of the energy meter is complete.
	494
	495	Another energy meter is a single active energy meter with a floating-point format.
	496
	497	Its default device address is 01, and the following are the parameters for configuring two energy meters.
	498
44.2	499	[[image:image-20220601142452-3.png]]
1.2	500
	501
45.2	502	[[image:image-20220601142607-4.png]]
35.2	503
57.12	504
39.5	505	PAYLOAD:01 08 DF 43 62
1.2	506
	507	* 08 DF is the valid value of the meter with device address 02.
	508	* 43 62 is the valid value of the meter with device address 01.
	509
	510	== 1.4 Example 4: Circuit Breaker Remote Open Close ==
	511
	512
57.12	513	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.
	514
	515	The structure is like below:
	516
36.2	517	[[image:image-20220527094330-30.png]]
1.2	518
	519	Connection
	520
	521
57.13	522	* 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/]]
57.12	523
1.2	524	== 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
	525
57.12	526
1.2	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-BL to connect to SEM Three Energy Meter and send the data to mobile phone for remote minitor. The structure is like below:
	528
57.13	529	* 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\|\|style="background-color: rgb(255, 255, 255);"]]
	530	* 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]]
1.2	531
57.14	532	== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
1.2	533
57.13	534
1.2	535	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:
	536
57.13	537	* 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\|\|style="background-color: rgb(255, 255, 255);"]]
1.2	538
57.14	539	== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
1.2	540
57.13	541
38.1	542	[[image:image-20220527094556-31.png]]
1.2	543
	544	Network Structure
	545
57.13	546
1.2	547	* [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]

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

Applications

Navigation