Wiki source code of Point to Point Communication of LT-22222-L

Version 19.4 by Xiaoling on 2022/11/15 09:14

version	line-number	content
19.3	1	Table of Contents：
16.2	2
1.1	3	{{toc/}}
	4
16.2	5
	6
	7
19.3	8	= 1. Overview =
1.1	9
6.1	10	(((
19.2	11
	12
1.1	13	Shipped LT-22222-L is base on LoRaWAN protocol. We also develop a open source Point to Point LoRa protocol for LT-22222-L. The source code and hex file can be found at:
6.1	14	)))
1.1	15
6.1	16	(((
1.1	17	[[Point to Point Software for LT-22222-L>>https://github.com/dragino/LT-22222-L]].
6.1	18	)))
1.1	19
	20
19.3	21	= 2. Features for this firmware =
1.1	22
19.3	23	== 2.1 Point To Point ==
4.2	24
19.3	25	=== 2.1.1 Overview ===
8.1	26
15.4	27
8.2	28	[[image:image-20220602111219-1.png\|\|height="472" width="972"]]
4.2	29
	30
19.3	31	=== 2.2.2 Configure ===
4.2	32
15.3	33
19.3	34	(% border="1" style="background-color:#f7faff; color:black; width:360px" %)
	35	\|=(% style="width: 179px;" %)A's configuration\|=(% style="width: 177px;" %)B's configuration
	36	\|(% style="width:179px" %)AT+GROUPMOD=0\|(% style="width:177px" %)AT+GROUPMOD=0
	37	\|(% style="width:179px" %)AT+TXCHS=868700000\|(% style="width:177px" %)AT+TXCHS=869000000
	38	\|(% style="width:179px" %)AT+RXCHS=869000000\|(% style="width:177px" %)AT+RXCHS=868700000
	39	\|(% style="width:179px" %)AT+TRIG1=2,50\|(% style="width:177px" %)AT+TRIG1=2,50
	40	\|(% style="width:179px" %)AT+TRIG2=2,50\|(% style="width:177px" %)AT+TRIG2=2,50
	41	\|(% style="width:179px" %)AT+DI1TODO1=2\|(% style="width:177px" %)AT+DI1TODO1=2
	42	\|(% style="width:179px" %)AT+DI1TORO1=2\|(% style="width:177px" %)AT+DI1TORO1=2
	43	\|(% style="width:179px" %)AT+DI2TODO2=2 \|(% style="width:177px" %)AT+DI2TODO2=2
	44	\|(% style="width:179px" %)AT+DI2TORO2=2\|(% style="width:177px" %)AT+DI2TORO2=2
4.2	45
19.2	46
	47
19.3	48	=== 2.2.3 Serial port display ===
12.2	49
15.2	50
12.2	51	(% class="wikigeneratedid" %)
4.2	52	[[image:image-20220602111219-2.png]]
	53
	54
12.2	55	(% class="wikigeneratedid" %)
4.2	56	[[image:image-20220602111219-3.png]]
	57
19.2	58
12.2	59	(% class="wikigeneratedid" %)
	60	If the sender does not get the ACK reply from the receiver, it will retransmit up to 4 times, each interval is 6 seconds, and the UplinkCounter of the retransmission will not increase.
	61
	62
19.4	63	== 2.2 Point To Mult-Point ==
12.2	64
19.3	65	=== 2.2.1 Overview ===
12.2	66
	67
15.2	68	[[image:1654152390874-192.png]]
12.2	69
	70
19.3	71	=== 2.2.2 Configure ===
15.2	72
	73
19.2	74	(% style="color:blue" %)Configuration of the TX group:
15.2	75
	76	AT+GROUPMOD=0,2
	77
	78	AT+TXCHS=868700000
	79
	80	AT+RXCHS=869000000
	81
	82	AT+TRIG1=2,50
	83
	84	AT+TRIG2=2,50
	85
	86	AT+DI1TODO1=1
	87
	88	AT+DI1TORO1=1
	89
	90	AT+DI2TODO2=1
	91
	92	AT+DI2TORO2=1
	93
	94
19.2	95	(% style="color:blue" %)Configuration for RX group number 1:
15.2	96
	97	AT+GROUPMOD=1,1
	98
	99	AT+TXCHS=869000000
	100
	101	AT+RXCHS=868700000
	102
	103
19.2	104	(% style="color:blue" %)Configuration for RX group number 2:
15.2	105
	106	AT+GROUPMOD=1,2
	107
	108	AT+TXCHS=869000000
	109
	110	AT+RXCHS=868700000
	111
	112
19.3	113	=== 2.2.3 Serial port display ===
15.2	114
	115
	116	[[image:image-20220602144747-1.png]]
	117
	118
	119	[[image:image-20220602144747-2.png]]
	120
19.3	121
8.9	122	(((
15.2	123	If the TX group does not receive all the ACK replies from the RX group, it will retransmit up to 4 times, each time interval is 30 seconds, and the retransmission UplinkCounter will not increase.
8.9	124	)))
4.2	125
8.2	126
19.3	127	== 2.3 AT command ==
8.2	128
	129
11.3	130	(((
8.6	131	(% style="color:#037691" %)ATZ (%%): Trig a reset of the MCU
11.3	132	)))
8.2	133
11.3	134	(((
8.6	135	(% style="color:#037691" %)AT+FDR (%%): Reset Parameters to Factory Default, Keys Reserve
11.3	136	)))
8.2	137
11.3	138	(((
8.6	139	(% style="color:#037691" %)AT+FCU (%%): Get or Set the Frame Counter Uplink
11.3	140	)))
8.2	141
11.3	142	(((
8.6	143	(% style="color:#037691" %)AT+FCD (%%): Get or Set the Frame Counter Downlink
11.3	144	)))
8.2	145
11.3	146	(((
8.6	147	(% style="color:#037691" %)AT+TXP (%%): Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)
11.3	148	)))
8.2	149
11.3	150	(((
8.8	151	(% style="color:#037691" %)AT+SYNC (%%): Get or Set the Sync word [1:0x34,0:0x12] (default is 1)
11.3	152	)))
8.2	153
11.3	154	(((
8.7	155	(% style="color:#037691" %)AT+PMB (%%): Get or Set the preamble (default:8)
11.3	156	)))
8.2	157
11.3	158	(((
8.6	159	(% style="color:#037691" %)AT+TXCHS (%%): Get or Set the transmit frequency of TX (default:868700000)
11.3	160	)))
8.2	161
11.3	162	(((
8.6	163	(% style="color:#037691" %)AT+TXSF (%%): Get or Set the spreading factor of TX (7 to 12) (default:12)
11.3	164	)))
8.2	165
11.3	166	(((
8.6	167	(% style="color:#037691" %)AT+RXCHS (%%): Get or Set the transmit frequency of RX (default:869000000)
11.3	168	)))
8.2	169
11.3	170	(((
8.6	171	(% style="color:#037691" %)AT+RXSF (%%): Get or Set the spreading factor of RX (7 to 12) (default:12)
11.3	172	)))
8.2	173
11.3	174	(((
9.2	175	(% style="color:#037691" %)AT+BW (%%): Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)
11.3	176	)))
8.2	177
11.3	178	(((
8.7	179	(% 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)
11.3	180	)))
8.2	181
11.3	182	(((
8.6	183	(% style="color:#037691" %)AT+TDC (%%): Get or set the application data transmission interval in ms(default 10 minutes)
11.3	184	)))
8.2	185
11.3	186	(((
8.8	187	(% style="color:#037691" %)AT+VER (%%): Get firmware version number
11.3	188	)))
8.2	189
11.3	190	(((
9.2	191	(% style="color:#037691" %)AT+SEND (%%): Set Custom sent hex data
11.3	192	)))
8.2	193
11.3	194	(((
8.6	195	(% style="color:#037691" %)AT+GROUPMOD (%%): Set or Get the grouping mode of the device (default: 0)
11.3	196	)))
8.2	197
11.1	198	(((
11.3	199	(((
8.7	200	(% style="color:#037691" %)AT+GROUPID (%%): Set or Get the password for matching between TX group and RX group, which can be composed of numbers or characters (default: 12345678)
11.1	201	)))
11.3	202	)))
8.2	203
11.3	204	(((
8.6	205	(% style="color:#037691" %)AT+TRIG1 (%%): Set or Get the DI1 pin interrupt trigger mode (default 0,0)
11.3	206	)))
8.2	207
11.3	208	(((
8.7	209	(% style="color:#037691" %)AT+TRIG2 (%%): Set or Get the DI2 pin interrupt trigger mode (default 0,0)
11.3	210	)))
8.2	211
11.3	212	(((
8.7	213	(% style="color:#037691" %)AT+DI1TODO1 (%%): Set or get the mode in which DI1 maps to DO1 (default 0)
11.3	214	)))
8.2	215
11.3	216	(((
8.7	217	(% style="color:#037691" %)AT+DI1TORO1 (%%): Set or get the mode in which DI1 maps to RO1(default 0)
11.3	218	)))
8.2	219
11.3	220	(((
8.6	221	(% style="color:#037691" %)AT+DI2TODO2 (%%): Set or get the mode in which DI2 maps to DO2(default 0)
11.3	222	)))
8.2	223
11.3	224	(((
8.7	225	(% style="color:#037691" %)AT+DI2TORO2 (%%): Set or get the mode in which DI2 maps to RO2(default 0)
11.3	226	)))
8.2	227
	228
11.3	229	(((
19.3	230	(% style="color:blue" %)Example 1:
11.3	231	)))
8.2	232
11.3	233	(((
8.7	234	AT+SEND=01020304 will send a payload of 01020304
11.3	235	)))
8.2	236
	237
11.3	238	(((
19.2	239	(% style="color:blue" %)Example 2:
11.3	240	)))
8.2	241
11.3	242	(((
8.8	243	AT+TRIGx=a Trigger directly without triggering time
11.3	244	)))
8.2	245
11.3	246	(((
8.7	247	AT+TRIGx=a,b
11.3	248	)))
8.2	249
11.3	250	(((
19.3	251	a=0: falling edge;
11.3	252	)))
8.2	253
11.3	254	(((
19.3	255	a=1: rising edge;
11.3	256	)))
8.2	257
11.3	258	(((
19.3	259	a=2: falling edge or rising edge;
11.3	260	)))
8.2	261
11.3	262	(((
19.3	263	b: triggering time in milliseconds.
11.3	264	)))
8.2	265
11.3	266	(((
19.3	267	AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
11.3	268	)))
8.2	269
	270
11.3	271	(((
19.2	272	(% style="color:blue" %)Example 3:
11.3	273	)))
8.2	274
11.3	275	(((
8.7	276	AT+DI1TODO1= maps value
11.3	277	)))
8.2	278
11.3	279	(((
8.7	280	AT+DI1TORO1= maps value
11.3	281	)))
8.2	282
11.3	283	(((
8.7	284	AT+DI2TODO2= maps value
11.3	285	)))
8.2	286
11.3	287	(((
8.7	288	AT+DI2TORO2= maps value
11.3	289	)))
8.7	290
11.3	291	(((
	292
	293	)))
8.7	294
19.3	295	(% border="1" style="background-color:#f7faff; color:black; width:690px" %)
11.3	296	\|=(% style="width: 102px;" %)(((
	297	Maps value
	298	)))\|=(% style="width: 331px;" %)(((
	299	DIx to DOx
19.3	300	)))\|=(% style="width: 251px;" %)(((
11.3	301	DIx to ROx
	302	)))
	303	\|(% style="width:102px" %)(((
	304	0
	305	)))\|(% style="width:331px" %)(((
	306	No Action
19.3	307	)))\|(% style="width:251px" %)(((
11.3	308	No Action
	309	)))
	310	\|(% style="width:102px" %)(((
	311	1
	312	)))\|(% style="width:331px" %)(((
	313	If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level
19.3	314	)))\|(% style="width:251px" %)(((
11.3	315	(((
8.2	316	If DIx is high, control ROx to close,
11.3	317	)))
8.2	318
11.3	319	(((
8.2	320	if DIx is low, control ROx to open
	321	)))
11.3	322	)))
	323	\|(% style="width:102px" %)(((
	324	2
	325	)))\|(% style="width:331px" %)(((
	326	If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level
19.3	327	)))\|(% style="width:251px" %)(((
11.3	328	(((
8.2	329	If DIx is high, control ROx to open,
11.3	330	)))
8.2	331
11.3	332	(((
8.2	333	if DIx is low, control ROx to close
	334	)))
11.3	335	)))
	336	\|(% style="width:102px" %)(((
	337	3
	338	)))\|(% style="width:331px" %)(((
	339	DOx state flip
19.3	340	)))\|(% style="width:251px" %)(((
11.3	341	ROx state flip
	342	)))
8.2	343
11.3	344	(((
19.3	345
	346
19.2	347	(% style="color:blue" %)Example 4:
11.3	348	)))
8.2	349
11.3	350	(((
8.7	351	AT+GROUPMOD=0 Set to point to point mode
11.3	352	)))
8.2	353
11.3	354	(((
8.7	355	AT+GROUPMOD=0,aa Set the TX group that controls the number of aa (The maximum value of aa is 8)
11.3	356	)))
8.2	357
11.1	358	(((
8.7	359	AT+GROUPMOD=1,bb Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8)
11.1	360	)))
8.2	361
11.3	362	(((
8.7	363	AT+GROUPMOD=0,2 Set to control the TX group of the two RX groups
11.3	364	)))
8.2	365
11.3	366	(((
8.7	367	AT+GROUPMOD=1,1 Set the RX group numbered 1
11.3	368	)))
8.2	369
11.3	370	(((
8.7	371	AT+GROUPMOD=1,2 Set the RX group numbered 2
19.2	372	)))
19.1	373
	374
	375	=== 2.3.1 TRIG command is configured in the transmit LT. (LT1)(Since firmware 1.3) ===
8.2	376
19.2	377
19.4	378	AT+TRIGx=a Trigger transmit directly without triggering time
8.2	379
19.3	380	AT+TRIGx=a,b Trigger transmit with triggering time threshold
19.1	381
19.4	382	AT+TRIGx=a,b,c Trigger transmit with triggering time threshold, and continue to transmit every xx seconds if DI status no change.
19.1	383
	384
19.3	385	a=0: falling edge;
19.1	386
19.3	387	a=1: rising edge;
19.1	388
19.3	389	a=2: falling edge or rising edge;
19.1	390
19.3	391	b: triggering time in milliseconds.
19.1	392
19.3	393	c: transmit interval
19.1	394
	395
19.3	396	(% style="color:blue" %)Use Case 1(%%): Once the DI1 port status change ( either from low to high or high to low, LT1 sends a trigger to LT-2)
19.1	397
19.3	398	Command:
19.1	399
19.3	400	AT+TRIG1=2,50 Falling edge or rising edge trigger, and the trigger time should exceed 50ms.
19.1	401
	402
19.3	403	(% style="color:blue" %)Use Case 2: (%%)Sync LT2 RO / DO status with LT1 every minute.
19.1	404
19.3	405	Command:
19.1	406
19.3	407	AT+TRIG2=2,50,60 Once there is falling edge or rising edge on DI2 of LT1, LT1 will transmit trigger to LT2 and LT2 can sync the status of RO/DO.
19.1	408
	409
	410	=== 2.3.2 RO/DO is configured in the receiver LT (LT2)(Since firmware 1.3) ===
	411
19.3	412
19.1	413	AT+DI1TODO1= maps value[,latch time]
	414
	415	AT+DI1TORO1= maps value[,latch time]
	416
	417	AT+DI2TODO2= maps value[,latch time]
	418
	419	AT+DI2TORO2= maps value[,latch time]
	420
	421
19.3	422	(% border="1" style="background-color:#f7faff; color:black; width:774px" %)
	423	\|(% style="width:105px" %) Maps value\|(% style="width:415px" %)DIx to DOx\|(% style="width:249px" %)DIx to ROx
	424	\|(% style="width:105px" %)0\|(% style="width:415px" %)No Action\|(% style="width:249px" %)No Action
	425	\|(% style="width:105px" %)1\|(% style="width:415px" %)If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level\|(% style="width:249px" %)(((
19.1	426	If DIx is high, control ROx to close,
	427
	428	if DIx is low, control ROx to open
	429	)))
19.3	430	\|(% style="width:105px" %)2\|(% style="width:415px" %)If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level\|(% style="width:249px" %)(((
19.1	431	If DIx is high, control ROx to open,
	432
	433	if DIx is low, control ROx to close
	434	)))
19.3	435	\|(% style="width:105px" %)3\|(% style="width:415px" %)DOx state flip\|(% style="width:249px" %)ROx state flip
19.1	436
	437	latch time, if latch time is defined, DO or RO will go back to the original status after latch time, if there is a new trigger comes, the LT2 will use the new latch time settings and ignore the old one.
	438
	439
19.3	440	(% style="color:blue" %)Case1:
19.1	441
19.4	442	AT+DI1TODO1=1 ~/~/ LT2 DO1 will follow LT1 DI1 trigger command, if DI1 of LT1 is trigger high, DO1 of LT2 will output low, if DI1 of LT1 is trigger low, DO2 of LT2 will output high.
19.1	443
	444
19.3	445	(% style="color:blue" %)Case2:
19.1	446
19.4	447	AT+DI1TODO1=1,60 ~/~/ LT2 DO1 will follow LT1 DI1 trigger command, DO1 will keep the status 60 seconds and then go back to original state.
19.1	448
	449
	450	=== 2.3.3 Save the RO/DO status during power off(Since firmware 1.3) ===
	451
19.2	452
19.1	453	Enable/Disbale retain Digital Output/Relay Output after power off / Power On
	454
19.4	455	AT+DOROSAVE=0 ~/~/ Disable Retain after power off/on
19.1	456
19.4	457	AT+DOROSAVE=1 ~/~/ Enable Retain after power off/on
19.1	458
19.4	459	AT+DOROSAVE=2,a,b,c,d ~/~/ set DO/RO port to default state after power on.
19.1	460
19.4	461	a: for DO1
19.1	462
19.4	463	b: for DO2
19.1	464
19.4	465	c: for RO1
19.1	466
19.4	467	d: for RO2.
19.1	468
	469
19.3	470	Example:
19.1	471
19.3	472	AT+DOROSAVE=2,0,0,0,1 ~/~/ Set DO1/DO2 to Low, RO1 to open after power on , set RO2 to close after power on.
19.1	473
19.3	474
19.1	475	=== 2.3.4 Control Sleep status.(Since firmware 1.3) ===
	476
19.3	477
19.1	478	DI2 can be used to set LT into sleep mode.
	479
19.4	480	AT+DI2SLEEP=1 ~/~/ Enable DI2 as Sleep pin
19.1	481
19.4	482	AT+DI2SLEEP=0 ~/~/ Disable DI2 as Sleep pin
19.1	483
	484	When DI2 is enabled as sleep pin, a falling trigger (with 500ms pulse) will set LT into sleep mode. A raising trigger will wake up it again.
	485
	486
19.3	487	== 2.4 Data Format ==
8.2	488
19.2	489
11.3	490	(((
8.2	491	8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
11.3	492	)))
8.2	493
11.3	494	(((
19.2	495	(% style="color:blue" %)Payload:
11.3	496	)))
8.2	497
19.3	498	(% border="1" style="background-color:#f7faff; color:black; width:825px" %)
	499	\|=(% style="width: 102px;" %)(((
11.3	500	Size (bytes)
19.3	501	)))\|=(% style="width: 74px;" %)(((
11.3	502	1
19.3	503	)))\|=(% style="width: 72px;" %)(((
11.3	504	1
19.3	505	)))\|=(% style="width: 47px;" %)(((
11.3	506	1
19.3	507	)))\|=(% style="width: 83px;" %)(((
11.3	508	1
19.3	509	)))\|=(% style="width: 90px;" %)(((
11.3	510	1
19.3	511	)))\|=(% style="width: 92px;" %)(((
11.3	512	1
19.3	513	)))\|=(% style="width: 78px;" %)(((
11.3	514	1
19.3	515	)))\|=(% style="width: 91px;" %)(((
11.3	516	1
19.3	517	)))\|=(% style="width: 91px;" %)(((
11.3	518	1
	519	)))
19.3	520	\|(% style="width:102px" %)(((
11.3	521	Value
19.3	522	)))\|(% style="width:74px" %)(((
11.3	523	address
19.3	524	)))\|(% style="width:72px" %)(((
11.3	525	request
19.3	526	)))\|(% style="width:47px" %)(((
11.3	527	ACK
19.3	528	)))\|(% style="width:83px" %)(((
11.3	529	(((
8.2	530	DI1&
	531	DI1 level
11.3	532	)))
19.3	533	)))\|(% style="width:90px" %)(((
11.3	534	DI1TODO1
19.3	535	)))\|(% style="width:92px" %)(((
11.3	536	DI1TORO1
19.3	537	)))\|(% style="width:78px" %)(((
11.3	538	(((
8.2	539	DI2&
19.3	540	DI2 leve
11.3	541	)))
19.3	542	)))\|(% style="width:91px" %)(((
11.3	543	DI2TODO2
19.3	544	)))\|(% style="width:91px" %)(((
11.3	545	DI2TORO2
	546	)))
8.2	547
11.3	548	(((
8.5	549	(% style="color:#037691" %)The first byte(%%): 00 is the broadcast address, 01-08 is the RX group number.
11.3	550	)))
8.2	551
11.3	552	(((
8.5	553	(% style="color:#037691" %)The second byte(%%): send mapping request when not 0, not request when it is 0.
11.3	554	)))
8.2	555
11.3	556	(((
8.5	557	(% style="color:#037691" %)The third byte(%%): ACK returned to the sender after the mapping is completed.
11.3	558	)))
8.2	559
11.1	560	(((
11.3	561	(((
8.5	562	(% style="color:#037691" %)The fourth byte(%%): the high four bits are 1 to represent DI1, and the low four bits are the level of DI1 when the interrupt is triggered.
11.1	563	)))
11.3	564	)))
8.2	565
11.3	566	(((
8.6	567	(% style="color:#037691" %)The Fifth byte(%%): DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
11.3	568	)))
8.2	569
11.3	570	(((
8.5	571	(% style="color:#037691" %)The Sixth byte(%%): 0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
11.3	572	)))
8.2	573
11.1	574	(((
11.3	575	(((
8.5	576	(% style="color:#037691" %)The seventh byte(%%): the high four bits are 2 to represent DI2, and the low four bits are the level of DI2 when the interrupt is triggered.
11.1	577	)))
11.3	578	)))
8.2	579
11.3	580	(((
8.6	581	(% style="color:#037691" %)The 8th byte(%%): DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
11.3	582	)))
8.2	583
11.3	584	(((
8.5	585	(% style="color:#037691" %)The 9th byte(%%): DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
11.3	586	)))
8.2	587
19.1	588	(((
1.1	589
19.1	590
19.3	591	(% style="color:blue" %)Payload:（Since firmware 1.3）The receiver replies to the sent packet
19.1	592	)))
	593
19.3	594	(% border="1" style="background-color:#f7faff; color:black; width:822px" %)
	595	\|=(% style="width: 97px;" %)(((
	596	Size(bytes)
	597	)))\|=(% style="width: 71px;" %)(((
19.1	598	1
19.3	599	)))\|=(% style="width: 70px;" %)(((
19.1	600	1
19.3	601	)))\|=(% style="width: 48px;" %)(((
19.1	602	1
19.3	603	)))\|=(% style="width: 85px;" %)(((
19.1	604	1
19.3	605	)))\|=(% style="width: 90px;" %)(((
19.1	606	1
19.3	607	)))\|=(% style="width: 88px;" %)(((
19.1	608	1
19.3	609	)))\|=(% style="width: 86px;" %)(((
19.1	610	1
19.3	611	)))\|=(% style="width: 92px;" %)(((
19.1	612	1
19.3	613	)))\|=(% style="width: 92px;" %)(((
19.1	614	1
	615	)))
19.3	616	\|(% style="width:97px" %)(((
19.1	617	Value
19.3	618	)))\|(% style="width:71px" %)(((
19.1	619	address
	620	)))\|(% style="width:70px" %)(((
	621	request
19.3	622	)))\|(% style="width:48px" %)(((
19.1	623	ACK
19.3	624	)))\|(% style="width:85px" %)(((
19.1	625	(((
	626	DO1&
	627	DO1 level
	628	)))
19.3	629	)))\|(% style="width:90px" %)(((
19.1	630	DI1TODO1
19.3	631	)))\|(% style="width:88px" %)(((
19.1	632	DI1TORO1
19.3	633	)))\|(% style="width:86px" %)(((
19.1	634	(((
	635	RO2&
	636	RO2 level
	637	)))
19.3	638	)))\|(% style="width:92px" %)(((
19.1	639	DI2TODO2
19.3	640	)))\|(% style="width:92px" %)(((
19.1	641	DI2TORO2
	642	)))
	643
	644	(((
	645	(% style="color:#037691" %)The first byte(%%): 00 is the broadcast address, 01-08 is the RX group number.
	646	)))
	647
	648	(((
	649	(% style="color:#037691" %)The second byte(%%): send mapping request when not 0, not request when it is 0.
	650	)))
	651
	652	(((
	653	(% style="color:#037691" %)The third byte(%%): ACK returned to the sender after the mapping is completed.
	654	)))
	655
	656	(((
	657	(((
	658	(% style="color:#037691" %)The fourth byte(%%): the high four bits are 1 to represent DO1, and the low four bits are the level of DO1 when the interrupt is triggered.
	659	)))
	660	)))
	661
	662	(((
	663	(% style="color:#037691" %)The Fifth byte(%%): DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
	664	)))
	665
	666	(((
	667	(% style="color:#037691" %)The Sixth byte(%%): 0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
	668	)))
	669
	670	(((
	671	(((
	672	(% style="color:#037691" %)The seventh byte(%%): the high four bits are 2 to represent RO2, and the low four bits are the level of RO2 when the interrupt is triggered.
	673	)))
	674	)))
	675
	676	(((
	677	(% style="color:#037691" %)The 8th byte(%%): DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
	678	)))
	679
	680	(((
	681	(% style="color:#037691" %)The 9th byte(%%): DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
	682	)))
	683
	684

Wiki source code of Point to Point Communication of LT-22222-L

Applications

Navigation