Wiki source code of Point to Point Communication for RS485-LN

Last modified by Bei Jinggeng on 2024/04/30 15:42

version	line-number	content
12.17	1	Table of Contents：
	2
12.15	3	{{toc/}}
	4
12.16	5
	6
	7
	8
	9
	10
3.2	11	= 1. point to point =
	12
	13	== 1.1 Overview ==
	14
	15	(((
11.2	16	[[image:1656901825798-483.png]]
3.2	17
	18
12.8	19
3.2	20	== 1.2 Configure ==
	21
	22
11.2	23	(% style="color:blue" %)A's configuration: B's configuration:
3.2	24
11.2	25	AT+GROUPMOD=0 AT+GROUPMOD=0
3.2	26
11.2	27	AT+GROUPID=12345678 AT+GROUPID=12345678
3.2	28
12.9	29	AT+TXCHS=868700000 AT+TXCHS=869000000
3.2	30
12.9	31	AT+RXCHS=869000000 AT+RXCHS=868700000
3.2	32
12.11	33	AT+CFGDEV=01 03 00 00 00 04,1 AT+CFGDEV=01 03 00 00 00 02,1
3.2	34
12.8	35	or or
3.2	36
12.11	37	AT+COMMAND=01 03 00 00 00 04,1 AT+COMMAND=01 03 00 00 00 02,1
11.2	38	)))
3.2	39
	40
	41
11.2	42	== 1.3 Serial port display ==
3.2	43
	44
11.2	45	[[image:image-20220704103422-2.png\|\|height="430" width="817"]]
3.2	46
12.8	47	(((
11.2	48	A sends a command to B to query B's RS485 sensor data and display it on A's upper computer.
12.8	49	)))
3.2	50
12.8	51	(((
11.2	52	Similarly, B sends a command to A to query A's RS485 sensor data and display it on B's upper computer.
12.8	53	)))
3.2	54
	55
11.2	56	[[image:image-20220704103502-3.png]]
3.2	57
12.8	58	(((
16.1	59	(% data-sider-select-id="8e84c97f-97c9-47b5-afbd-e7cc77629fea" %)
11.2	60	If the sender does not get the ACK reply from the receiver, it will retransmit up to 4 times, each interval is 10 seconds, and the UplinkCounter of the retransmission will not increase. (Retransmission only occurs when using the AT+CFGDEV command or triggering an external interrupt)
12.8	61	)))
3.2	62
	63
	64
12.15	65	= 2. Point To Mult-Point =
3.2	66
16.1	67	== (% data-sider-select-id="4dc2ef7f-a118-4ded-9b73-05d0d1e1b75b" %)2.1 Overview(%%) ==
3.2	68
	69
11.2	70	[[image:1656901541427-229.png]]
3.2	71
	72
16.1	73	== (% data-sider-select-id="bd833649-16b9-4259-adc1-73e489ec3912" %)2.2 Configure(%%) ==
3.2	74
	75
16.1	76	(% data-sider-select-id="809f0ceb-1a62-4e1d-8aa6-9a12c485bcb8" style="color:blue" %)Configuration of the TX group:
3.2	77
11.2	78	AT+GROUPMOD=0,2
3.2	79
11.2	80	AT+GROUPID=12345678
3.2	81
11.2	82	AT+TXCHS=868700000
3.2	83
11.2	84	AT+RXCHS=869000000
3.2	85
11.2	86	AT+CFGDEV=01 03 00 00 00 02,1
3.2	87
11.2	88	or
3.2	89
11.2	90	AT+COMMAND=01 03 00 00 00 02,1
3.2	91
	92
11.2	93	(% style="color:blue" %)Configuration for RX group number 1:
3.2	94
11.2	95	AT+GROUPMOD=1,1
3.2	96
11.2	97	AT+GROUPID=12345678
3.2	98
11.2	99	AT+TXCHS=869000000
3.2	100
11.2	101	AT+RXCHS=868700000
3.2	102
	103
11.2	104	(% style="color:blue" %)Configuration for RX group number 2:
3.2	105
11.2	106	AT+GROUPMOD=1,2
3.2	107
11.2	108	AT+GROUPID=12345678
3.2	109
11.2	110	AT+TXCHS=869000000
3.2	111
11.2	112	AT+RXCHS=868700000
3.2	113
	114
	115
16.1	116	== (% data-sider-select-id="0bffbb87-9169-426e-8f09-a6a5603b35a9" %)2.3 Serial port display(%%) ==
3.2	117
11.2	118	(% id="cke_bm_79849S" style="display:none" %) [[image:1656901280202-290.png]]
3.2	119
	120
11.2	121	[[image:image-20220704103658-4.png\|\|height="495" width="852"]]
3.2	122
12.8	123	(((
11.2	124	The TX group sends broadcast data to the RX group. After the RX group receives the data, it will reply to the TX group in order from small to large.(% style="display:none" %)
12.8	125	)))
3.2	126
11.2	127	(% style="display:none" %) (%%)
3.2	128
	129
11.2	130	[[image:image-20220704103658-5.png]]
3.2	131
12.8	132	(((
16.1	133	(% data-sider-select-id="4d98d2d3-b7f6-4f2a-91e1-d65b9392aca1" %)
11.2	134	If the sender does not get the ACK reply from the receiver, it will retransmit up to 4 times, each interval is 30 seconds, and the UplinkCounter of the retransmission will not increase.(Retransmission only occurs when using the AT+CFGDEV command or triggering an external interrupt)
12.8	135	)))
3.2	136
11.2	137	(% style="display:none" %) (%%)
3.2	138
16.1	139	(% data-sider-select-id="7b4bbeb1-7dda-4179-9621-d8d6f6aa0fc0" %)
	140	= (% data-sider-select-id="e960f7c8-2a3f-496a-b62f-425f1133b00e" %)3 Point to Point (RS485 Pass Through).(%%) =
3.2	141
16.1	142	== (% data-sider-select-id="4dc2ef7f-a118-4ded-9b73-05d0d1e1b75b" %)3.1 Overview(%%) ==
3.2	143
16.1	144	(% data-sider-select-id="e960f7c8-2a3f-496a-b62f-425f1133b00e" %)PC ~-~-> RS485 to USB adapter ~-~-> RS485-LN A<~-~-~-~--LoRa ~-~-~-~-> RS485-LN B<~-~- >RS485 sensor
	145
	146	[[image:image-20240430153458-2.png]]
	147
	148
	149	== (% data-sider-select-id="4dc2ef7f-a118-4ded-9b73-05d0d1e1b75b" %)3.2 (% data-sider-select-id="bd833649-16b9-4259-adc1-73e489ec3912" %)Configure(%%) ==
	150
	151	(% data-sider-select-id="809f0ceb-1a62-4e1d-8aa6-9a12c485bcb8" style="color:blue" %)Configuration of the PC:
	152
	153	(% data-sider-select-id="1f71c512-1e78-4d70-998d-fa9a5e6d5fc8" %)
	154	RS485 sensor read command
	155
	156
	157	(% data-sider-select-id="fb8dd359-d0dd-4b15-a1ec-d8a7532f876f" style="color:blue" %)Configuration for RX group number 1:
	158
	159	(% data-sider-select-id="85b4fff7-5f64-4d7c-9084-ed37c89c0db7" %)
	160	AT+MOD=1,500
	161
	162	(% data-sider-select-id="8131b4ed-95d6-45f2-a437-98c105271570" %)
	163	AT+GROUPID=12345678
	164
	165	AT+TXCHS=869000000
	166
	167	AT+RXCHS=868700000
	168
	169
	170	(% style="color:blue" %)Configuration for RX group number 2:
	171
	172	AT+GROUPID=12345678
	173
	174	AT+TXCHS=869000000
	175
	176	AT+RXCHS=868700000
	177
	178	Configure parameters consistent with the RS485 sensor：
	179
	180	AT+BAUDR=4800
	181
	182	AT+PARITY=0
	183
	184	AT+DATABIT=8
	185
	186	AT+STOPBIT=0
	187
	188	AT+SCHEDULE=0,0
	189
	190	AT+CMDDL=400
	191
	192
	193
	194
	195	== (% data-sider-select-id="0bffbb87-9169-426e-8f09-a6a5603b35a9" %)3.3 Serial port display(%%) ==
	196
	197	[[image:image-20240430145609-1.png\|\|height="652" width="1152"]]
	198
	199	If the sender does not get the ACK reply from the receiver, it will retransmit up to 4 times, each interval is 30 seconds, and the UplinkCounter of the retransmission will not increase.(Retransmission only occurs when using the AT+CFGDEV command or triggering an external interrupt)
	200
	201
	202	= (% data-sider-select-id="45a0429e-5661-4b10-9cb4-be581299c196" %)4. AT command(%%) =
	203
12.8	204	(% style="display:none" %) (%%) (% style="display:none" %)
3.2	205
	206	(((
	207	(% style="color:#037691" %)ATZ (%%): Trig a reset of the MCU
	208	)))
	209
	210	(((
	211	(% style="color:#037691" %)AT+FDR (%%): Reset Parameters to Factory Default, Keys Reserve
	212	)))
	213
	214	(((
11.2	215	(% style="color:#037691" %)AT+FCU (%%): Get or Set the Frame Co(% style="display:none" %) (%%)unter Uplink
3.2	216	)))
	217
	218	(((
	219	(% style="color:#037691" %)AT+FCD (%%): Get or Set the Frame Counter Downlink
	220	)))
	221
	222	(((
	223	(% style="color:#037691" %)AT+TXP (%%): Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)
	224	)))
	225
	226	(((
	227	(% style="color:#037691" %)AT+SYNC (%%): Get or Set the Sync word [1:0x34,0:0x12] (default is 1)
	228	)))
	229
	230	(((
	231	(% style="color:#037691" %)AT+PMB (%%): Get or Set the preamble (default:8)
	232	)))
	233
	234	(((
	235	(% style="color:#037691" %)AT+TXCHS (%%): Get or Set the transmit frequency of TX (default:868700000)
	236	)))
	237
	238	(((
	239	(% style="color:#037691" %)AT+TXSF (%%): Get or Set the spreading factor of TX (7 to 12) (default:12)
	240	)))
	241
	242	(((
	243	(% style="color:#037691" %)AT+RXCHS (%%): Get or Set the transmit frequency of RX (default:869000000)
	244	)))
	245
	246	(((
	247	(% style="color:#037691" %)AT+RXSF (%%): Get or Set the spreading factor of RX (7 to 12) (default:12)
	248	)))
	249
	250	(((
	251	(% style="color:#037691" %)AT+BW (%%): Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)
	252	)))
	253
	254	(((
	255	(% style="color:#037691" %)AT+CR (%%): Get or Set the coding rate [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8] (default:1)
	256	)))
	257
	258	(((
	259	(% style="color:#037691" %)AT+TDC (%%): Get or set the application data transmission interval in ms(default 10 minutes)
	260	)))
	261
	262	(((
	263	(% style="color:#037691" %)AT+VER (%%): Get firmware version number
	264	)))
	265
	266	(((
	267	(% style="color:#037691" %)AT+SEND (%%): Set Custom sent hex data
	268	)))
	269
	270	(((
12.13	271	(% style="color:#037691" %)AT+GROUPMOD (%%): Set or Get the grouping (% style="display:none" %) (%%)mode of the device (default: 0)
3.2	272	)))
	273
	274	(((
	275	(((
12.13	276	(% style="color:#037691" %)AT+GROUPID (%%): Set or Get the password for (% style="display:none" %) (%%)matching between TX group and RX group, which can be composed of numbers or characters (default: 12345678)(% style="display:none" %)
3.2	277
12.9	278	(((
11.2	279	(% style="color:#037691" %)AT+INTMOD (%%): Get or Set the trigger interrupt mode
12.9	280	)))
3.2	281
12.9	282	(((
11.2	283	(% style="color:#037691" %)AT+BAUDR (%%): Get or set the baud rate of rs485. (default: 9600)
12.9	284	)))
3.2	285
12.9	286	(((
11.2	287	(% style="color:#037691" %)AT+DATABIT (%%): Get or Set databit(7:7 bits,8:8 bits) of rs485 (default: 8)
12.9	288	)))
3.2	289
12.9	290	(((
12.13	291	(% style="color:#037691" %)AT+PARITY (%%): Get or Set parity(0:none,1:odd,2:even) of rs485(default: 0)
12.9	292	)))
11.2	293
12.9	294	(((
12.13	295	(% style="color:#037691" %)AT+STOPBIT (%%): Get or Set stopbit(0:1 bit,1:1.5 bit,2:2 bit) of rs485(default: 0)
12.9	296	)))
11.2	297
12.9	298	(((
11.2	299	(% style="color:#037691" %)AT+CMDDL (%%): Get or Set the delay waiting time after receiving RS485 command (default: 400)
12.9	300	)))
11.2	301
12.9	302	(((
11.2	303	(% style="color:#037691" %)AT+CRCCHECK (%%): Get or set to receive and verify RS485 sensor data (0: Disable,1:CRC16_MODBUS) (default: 1)
12.9	304	)))
11.2	305
12.9	306	(((
11.2	307	(% style="color:#037691" %)AT+SCHEDULE (%%): Each TDC sends command data to the receiver.
12.9	308	)))
11.2	309
12.9	310	(((
11.2	311	(% style="color:#037691" %)AT+CFGDEV (%%): Instantly send RS485 commands to the receiver.
12.9	312	)))
11.2	313
12.9	314	(((
12.13	315	(% style="color:#037691" %)AT+RS485 (%%): Send commands to the local RS485 device.
12.9	316	)))
11.2	317
12.9	318	(((
11.2	319	(% style="color:#037691" %)AT+MOD (%%): Get or set the host send mode.(default: 0)
3.2	320	)))
11.2	321	)))
12.9	322	)))
3.2	323
	324	(((
11.2	325
3.2	326	)))
	327
	328	(((
11.2	329
3.2	330	)))
	331
	332	(((
	333	(% style="color:#4f81bd" %)Example 1:
	334	)))
	335
	336	(((
	337	AT+SEND=01020304 will send a payload of 01020304
	338	)))
	339
	340	(((
	341
12.7	342
	343
3.2	344	)))
	345
	346	(((
12.10	347	(((
3.2	348	(% style="color:#4f81bd" %)Example 2:
12.10	349	)))
3.2	350
12.10	351	(((
12.2	352	AT+INTMOD=aa (0:Disable,1:falling or rising,2:falling,3:rising) (default: 2)
3.2	353	)))
12.10	354	)))
3.2	355
	356	(((
12.10	357	(((
12.2	358	RS485-LN support external Interrupt uplink since hardware v1.2 release.
12.10	359	)))
3.2	360
12.2	361	[[image:image-20220704104958-6.png]]
3.2	362
12.10	363	(((
	364	Connect the Interrupt pin to RS485-LN INT port and connect the GND pin to V- port. When there is a high voltage (Max 24v) on INT pin. Device will send an lora packet.
3.2	365	)))
12.10	366	)))
3.2	367
	368	(((
	369
12.7	370
	371
3.2	372	)))
	373
	374	(((
12.10	375	(((
3.2	376	(% style="color:#4f81bd" %)Example 3:
12.10	377	)))
3.2	378
12.10	379	(((
12.2	380	AT+SCHEDULE: This command will be sent to Group RX during each transmission, Max command length is 14 bytes. The grammar is:
12.10	381	)))
3.2	382
12.10	383	(((
12.2	384	AT+SCHEDULE =xx xx xx xx xx xx xx xx xx xx xx xx,m
12.10	385	)))
3.2	386
12.10	387	(((
12.2	388	xx xx xx xx xx xx xx xx xx xx xx xx: The RS485 command to be sent
12.10	389	)))
3.2	390
12.10	391	(((
12.2	392	m: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
12.10	393	)))
3.2	394
12.10	395	(((
	396	For example, if we have a RS485 sensor. The command to get sensor value is: 01 03 0B B8 00 02 46 0A. Where 01 03 0B B8 00 02 is the Modbus command to read the register 0B B8 where stored the sensor value. The 46 0A is the CRC-16/MODBUS which calculate manually.
3.2	397	)))
12.10	398	)))
3.2	399
	400	(((
12.2	401
3.2	402	)))
	403
	404	(((
12.2	405
3.2	406	)))
	407
	408	(((
12.10	409	(((
3.2	410	(% style="color:#4f81bd" %)Example 4:
12.10	411	)))
3.2	412
12.10	413	(((
12.3	414	AT+CFGDEV : This command will be sent to Group RX.
12.10	415	)))
3.2	416
12.10	417	(((
12.3	418	The grammar is:
12.10	419	)))
3.2	420
12.10	421	(((
12.3	422	AT+CFGDEV =xx xx xx xx xx xx xx xx xx xx xx xx,m
12.10	423	)))
12.3	424
12.10	425	(((
12.3	426	xx xx xx xx xx xx xx xx xx xx xx xx: The RS485 command to be sent
12.10	427	)))
12.3	428
12.10	429	(((
12.3	430	m: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command.
3.2	431	)))
12.10	432	)))
3.2	433
	434	(((
12.3	435
3.2	436
12.3	437
12.10	438	(((
12.3	439	(% style="color:#4f81bd" %)Example 5：(%%)
3.2	440	)))
12.10	441	)))
3.2	442
12.10	443	(((
12.3	444	AT+RS485: This command will be sent to local RS485 device.
12.10	445	)))
3.2	446
12.10	447	(((
12.3	448	The grammar is:
12.10	449	)))
12.3	450
12.10	451	(((
12.3	452	AT+RS485 =xx xx xx xx xx xx xx xx xx xx xx xx,m
12.10	453	)))
12.3	454
12.10	455	(((
12.3	456	xx xx xx xx xx xx xx xx xx xx xx xx: The RS485 command to be sent
12.10	457	)))
12.3	458
12.10	459	(((
12.3	460	m: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command.
12.10	461	)))
12.3	462
	463
	464
12.10	465	(((
12.3	466	(% style="color:#4f81bd" %)Example 6：
12.10	467	)))
12.3	468
12.10	469	(((
12.3	470	AT+MOD=0 Commands are transparently transmitted through UART.
12.10	471	)))
12.3	472
12.10	473	(((
12.3	474	AT+MOD=1,500 Commands are transparently transmitted through RS485. 500 ms after the first character is received from RS485, all characters are commands.
12.10	475	)))
12.3	476
	477
	478
12.10	479	(((
12.3	480	(% style="color:#4f81bd" %)Example 7：
12.10	481	)))
12.3	482
12.10	483	(((
12.3	484	AT+GROUPMOD=0 Set to point to point mode
12.10	485	)))
12.3	486
12.10	487	(((
12.3	488	AT+GROUPMOD=0,aa Set the TX group that controls the number of aa (The maximum value of aa is 8)
12.10	489	)))
12.3	490
12.10	491	(((
12.3	492	AT+GROUPMOD=1,bb Set to the RX group controlled by the TX group, numbered bb(The maximum value of bb is 8)
12.10	493	)))
12.3	494
	495
12.10	496	(((
12.3	497	AT+GROUPMOD=0,2 Set to control the TX group of the two RX groups
12.10	498	)))
12.3	499
12.10	500	(((
12.3	501	AT+GROUPMOD=1,1 Set the RX group numbered 1
12.10	502	)))
12.3	503
12.10	504	(((
12.3	505	AT+GROUPMOD=1,2 Set the RX group numbered 2
12.10	506	)))
12.3	507
	508
	509
16.1	510	= 5. Data Format =
12.3	511
	512
12.10	513	(((
12.4	514	8 bytes of GROUPID +n payload + 4 bytes of checksum
12.10	515	)))
12.3	516
	517
12.10	518	(((
12.4	519	Payload(S12, SF11, SF10 maximum length is 59, SF9 maximum length is 123, SF8, SF7 maximum length is 230):
12.10	520	)))
3.2	521
12.12	522	(% border="1" cellspacing="10" style="background-color:#f7faff; color:black; width:430px" %)
	523	\|=(% style="width: 60px;" %)Size (bytes)\|=(% style="width: 60px;" %)1\|=(% style="width: 60px;" %)1\|=(% style="width: 60px;" %)1\|=(% style="width: 80px;" %)1\|=(% style="width: 100px;" %)payloadsize
12.4	524	\|(% style="width:100px" %)Value\|(% style="width:71px" %)address\|(% style="width:71px" %)request\|(% style="width:49px" %)ACK\|(% style="width:99px" %)payloadsize\|(% style="width:139px" %)(((
	525	command data or
	526
	527	return data
	528	)))
	529
12.10	530	(((
12.13	531	(% style="color:#037691" %)The first byte： (%%)00 is the broadcast address, 01-08 is the RX group number
12.10	532	)))
12.4	533
12.10	534	(((
12.4	535	(% style="color:#037691" %)The second byte：(%%) send request when not 0, not request when it is 0
12.10	536	)))
12.4	537
12.10	538	(((
12.4	539	(% style="color:#037691" %)The third byte：(%%) ACK returned to the sender.
12.10	540	)))
12.4	541
12.10	542	(((
12.4	543	(% style="color:#037691" %)The fourth byte：(%%) The command length of the sender or the data length of the RS485 sensor returned by the receiver.
12.10	544	)))
12.4	545
12.10	546	(((
12.4	547	(% style="color:#037691" %)The Fifth byte：(%%) RS485 command or RS485 return data.
12.10	548	)))
12.4	549
	550
3.2	551	(((
	552
	553	)))

Wiki source code of Point to Point Communication for RS485-LN

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