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

Version 19.2 by Xiaoling on 2022/11/15 08:47

version	line-number	content
16.2	1	Contents：
	2
1.1	3	{{toc/}}
	4
16.2	5
	6
	7
4.2	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
4.2	21	= 2. Features for this firmware =
1.1	22
8.2	23	== 2.1 Point To Point ==
4.2	24
12.2	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
12.2	31	=== 2.2.2 Configure ===
4.2	32
15.3	33
4.3	34	(% border="1" style="background-color:#f7faff; color:black; width:500px" %)
	35	\|=A's configuration\|=B's configuration
	36	\|AT+GROUPMOD=0\|AT+GROUPMOD=0
	37	\|AT+TXCHS=868700000\|AT+TXCHS=869000000
	38	\|AT+RXCHS=869000000\|AT+RXCHS=868700000
	39	\|AT+TRIG1=2,50\|AT+TRIG1=2,50
	40	\|AT+TRIG2=2,50\|AT+TRIG2=2,50
	41	\|AT+DI1TODO1=2\|AT+DI1TODO1=2
	42	\|AT+DI1TORO1=2\|AT+DI1TORO1=2
	43	\|AT+DI2TODO2=2 \|AT+DI2TODO2=2
	44	\|AT+DI2TORO2=2\|AT+DI2TORO2=2
4.2	45
19.2	46
	47
15.2	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
	63	== 2.2 Point To Mult-Point ==
	64
15.2	65	=== 2.2.1 Overview ===
12.2	66
	67
15.2	68	[[image:1654152390874-192.png]]
12.2	69
	70
15.2	71	=== 2.2.2 Configure ===
	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
	113	=== 2.2.3 Serial port display ===
	114
	115
	116	[[image:image-20220602144747-1.png]]
	117
	118
	119	[[image:image-20220602144747-2.png]]
	120
8.9	121	(((
15.2	122	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	123	)))
4.2	124
8.2	125
	126	== 2.3 AT command ==
	127
	128
11.3	129	(((
8.6	130	(% style="color:#037691" %)ATZ (%%): Trig a reset of the MCU
11.3	131	)))
8.2	132
11.3	133	(((
8.6	134	(% style="color:#037691" %)AT+FDR (%%): Reset Parameters to Factory Default, Keys Reserve
11.3	135	)))
8.2	136
11.3	137	(((
8.6	138	(% style="color:#037691" %)AT+FCU (%%): Get or Set the Frame Counter Uplink
11.3	139	)))
8.2	140
11.3	141	(((
8.6	142	(% style="color:#037691" %)AT+FCD (%%): Get or Set the Frame Counter Downlink
11.3	143	)))
8.2	144
11.3	145	(((
8.6	146	(% style="color:#037691" %)AT+TXP (%%): Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)
11.3	147	)))
8.2	148
11.3	149	(((
8.8	150	(% style="color:#037691" %)AT+SYNC (%%): Get or Set the Sync word [1:0x34,0:0x12] (default is 1)
11.3	151	)))
8.2	152
11.3	153	(((
8.7	154	(% style="color:#037691" %)AT+PMB (%%): Get or Set the preamble (default:8)
11.3	155	)))
8.2	156
11.3	157	(((
8.6	158	(% style="color:#037691" %)AT+TXCHS (%%): Get or Set the transmit frequency of TX (default:868700000)
11.3	159	)))
8.2	160
11.3	161	(((
8.6	162	(% style="color:#037691" %)AT+TXSF (%%): Get or Set the spreading factor of TX (7 to 12) (default:12)
11.3	163	)))
8.2	164
11.3	165	(((
8.6	166	(% style="color:#037691" %)AT+RXCHS (%%): Get or Set the transmit frequency of RX (default:869000000)
11.3	167	)))
8.2	168
11.3	169	(((
8.6	170	(% style="color:#037691" %)AT+RXSF (%%): Get or Set the spreading factor of RX (7 to 12) (default:12)
11.3	171	)))
8.2	172
11.3	173	(((
9.2	174	(% style="color:#037691" %)AT+BW (%%): Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)
11.3	175	)))
8.2	176
11.3	177	(((
8.7	178	(% 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	179	)))
8.2	180
11.3	181	(((
8.6	182	(% style="color:#037691" %)AT+TDC (%%): Get or set the application data transmission interval in ms(default 10 minutes)
11.3	183	)))
8.2	184
11.3	185	(((
8.8	186	(% style="color:#037691" %)AT+VER (%%): Get firmware version number
11.3	187	)))
8.2	188
11.3	189	(((
9.2	190	(% style="color:#037691" %)AT+SEND (%%): Set Custom sent hex data
11.3	191	)))
8.2	192
11.3	193	(((
8.6	194	(% style="color:#037691" %)AT+GROUPMOD (%%): Set or Get the grouping mode of the device (default: 0)
11.3	195	)))
8.2	196
11.1	197	(((
11.3	198	(((
8.7	199	(% 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	200	)))
11.3	201	)))
8.2	202
11.3	203	(((
8.6	204	(% style="color:#037691" %)AT+TRIG1 (%%): Set or Get the DI1 pin interrupt trigger mode (default 0,0)
11.3	205	)))
8.2	206
11.3	207	(((
8.7	208	(% style="color:#037691" %)AT+TRIG2 (%%): Set or Get the DI2 pin interrupt trigger mode (default 0,0)
11.3	209	)))
8.2	210
11.3	211	(((
8.7	212	(% style="color:#037691" %)AT+DI1TODO1 (%%): Set or get the mode in which DI1 maps to DO1 (default 0)
11.3	213	)))
8.2	214
11.3	215	(((
8.7	216	(% style="color:#037691" %)AT+DI1TORO1 (%%): Set or get the mode in which DI1 maps to RO1(default 0)
11.3	217	)))
8.2	218
11.3	219	(((
8.6	220	(% style="color:#037691" %)AT+DI2TODO2 (%%): Set or get the mode in which DI2 maps to DO2(default 0)
11.3	221	)))
8.2	222
11.3	223	(((
8.7	224	(% style="color:#037691" %)AT+DI2TORO2 (%%): Set or get the mode in which DI2 maps to RO2(default 0)
11.3	225	)))
8.2	226
	227
	228
11.3	229	(((
8.7	230	(% style="color:#4f81bd" %)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
19.2	238
11.3	239	(((
19.2	240	(% style="color:blue" %)Example 2:
11.3	241	)))
8.2	242
11.3	243	(((
8.8	244	AT+TRIGx=a Trigger directly without triggering time
11.3	245	)))
8.2	246
11.3	247	(((
8.7	248	AT+TRIGx=a,b
11.3	249	)))
8.2	250
11.3	251	(((
8.7	252	a=0: falling edge;
11.3	253	)))
8.2	254
11.3	255	(((
8.7	256	a=1: rising edge;
11.3	257	)))
8.2	258
11.3	259	(((
8.7	260	a=2: falling edge or rising edge;
11.3	261	)))
8.2	262
11.3	263	(((
8.7	264	b: triggering time in milliseconds.
11.3	265	)))
8.2	266
11.3	267	(((
8.7	268	AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
11.3	269	)))
8.2	270
	271
11.3	272	(((
19.2	273	(% style="color:blue" %)Example 3:
11.3	274	)))
8.2	275
11.3	276	(((
8.7	277	AT+DI1TODO1= maps value
11.3	278	)))
8.2	279
11.3	280	(((
8.7	281	AT+DI1TORO1= maps value
11.3	282	)))
8.2	283
11.3	284	(((
8.7	285	AT+DI2TODO2= maps value
11.3	286	)))
8.2	287
11.3	288	(((
8.7	289	AT+DI2TORO2= maps value
11.3	290	)))
8.7	291
11.3	292	(((
	293
	294	)))
8.7	295
8.4	296	(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
11.3	297	\|=(% style="width: 102px;" %)(((
	298	Maps value
	299	)))\|=(% style="width: 331px;" %)(((
	300	DIx to DOx
	301	)))\|=(% style="width: 268px;" %)(((
	302	DIx to ROx
	303	)))
	304	\|(% style="width:102px" %)(((
	305	0
	306	)))\|(% style="width:331px" %)(((
	307	No Action
	308	)))\|(% style="width:268px" %)(((
	309	No Action
	310	)))
	311	\|(% style="width:102px" %)(((
	312	1
	313	)))\|(% style="width:331px" %)(((
	314	If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level
	315	)))\|(% style="width:268px" %)(((
	316	(((
8.2	317	If DIx is high, control ROx to close,
11.3	318	)))
8.2	319
11.3	320	(((
8.2	321	if DIx is low, control ROx to open
	322	)))
11.3	323	)))
	324	\|(% style="width:102px" %)(((
	325	2
	326	)))\|(% style="width:331px" %)(((
	327	If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level
	328	)))\|(% style="width:268px" %)(((
	329	(((
8.2	330	If DIx is high, control ROx to open,
11.3	331	)))
8.2	332
11.3	333	(((
8.2	334	if DIx is low, control ROx to close
	335	)))
11.3	336	)))
	337	\|(% style="width:102px" %)(((
	338	3
	339	)))\|(% style="width:331px" %)(((
	340	DOx state flip
	341	)))\|(% style="width:268px" %)(((
	342	ROx state flip
	343	)))
8.2	344
11.3	345	(((
19.2	346	(% style="color:blue" %)Example 4:
11.3	347	)))
8.2	348
11.3	349	(((
8.7	350	AT+GROUPMOD=0 Set to point to point mode
11.3	351	)))
8.2	352
11.3	353	(((
8.7	354	AT+GROUPMOD=0,aa Set the TX group that controls the number of aa (The maximum value of aa is 8)
11.3	355	)))
8.2	356
19.2	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
19.2	362
11.3	363	(((
8.7	364	AT+GROUPMOD=0,2 Set to control the TX group of the two RX groups
11.3	365	)))
8.2	366
11.3	367	(((
8.7	368	AT+GROUPMOD=1,1 Set the RX group numbered 1
11.3	369	)))
8.2	370
11.3	371	(((
8.7	372	AT+GROUPMOD=1,2 Set the RX group numbered 2
19.2	373	)))
19.1	374
	375
	376	=== 2.3.1 TRIG command is configured in the transmit LT. (LT1)(Since firmware 1.3) ===
8.2	377
19.2	378
19.1	379	AT+TRIGx=a Trigger transmit directly without triggering time
8.2	380
19.1	381	AT+TRIGx=a,b Trigger transmit with triggering time threshold
	382
	383	AT+TRIGx=a,b,c Trigger transmit with triggering time threshold, and continue to transmit every xx seconds if DI status no change.
	384
	385
	386	a=0: falling edge;
	387
	388	a=1: rising edge;
	389
	390	a=2: falling edge or rising edge;
	391
	392	b: triggering time in milliseconds.
	393
	394	c: transmit interval
	395
	396
19.2	397	(% 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	398
	399	Command:
	400
	401	AT+TRIG1=2,50 Falling edge or rising edge trigger, and the trigger time should exceed 50ms.
	402
	403
19.2	404	(% style="color:blue" %)Use Case 2: (%%)Sync LT2 RO / DO status with LT1 every minute.
19.1	405
	406	Command:
	407
	408	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.
	409
	410
	411	=== 2.3.2 RO/DO is configured in the receiver LT (LT2)(Since firmware 1.3) ===
	412
	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
	422	(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
	423	\| Maps value\|DIx to DOx\|DIx to ROx
	424	\|0\|No Action\|No Action
	425	\|1\|If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level\|(((
	426	If DIx is high, control ROx to close,
	427
	428	if DIx is low, control ROx to open
	429	)))
	430	\|2\|If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level\|(((
	431	If DIx is high, control ROx to open,
	432
	433	if DIx is low, control ROx to close
	434	)))
	435	\|3\|DOx state flip\|ROx state flip
	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
19.2	440	(% style="color:blue" %)Case1:
19.1	441
	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.
	443
	444
19.2	445	(% style="color:blue" %)Case2:
19.1	446
	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.
	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
	455	AT+DOROSAVE=0 ~/~/ Disable Retain after power off/on
	456
	457	AT+DOROSAVE=1 ~/~/ Enable Retain after power off/on
	458
	459	AT+DOROSAVE=2,a,b,c,d ~/~/ set DO/RO port to default state after power on.
	460
	461	a: for DO1
	462
	463	b: for DO2
	464
	465	c: for RO1
	466
	467	d: for RO2.
	468
	469	Example:
	470
	471	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.
	472
	473
	474	=== 2.3.4 Control Sleep status.(Since firmware 1.3) ===
	475
	476	DI2 can be used to set LT into sleep mode.
	477
	478	AT+DI2SLEEP=1 ~/~/Enable DI2 as Sleep pin
	479
	480	AT+DI2SLEEP=0 ~/~/Disable DI2 as Sleep pin
	481
	482	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.
	483
	484
8.2	485	== 2.4 Data Format ==
	486
19.2	487
11.3	488	(((
8.2	489	8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
11.3	490	)))
8.2	491
11.3	492	(((
	493
	494	)))
8.2	495
11.3	496	(((
19.2	497	(% style="color:blue" %)Payload:
11.3	498	)))
8.2	499
8.4	500	(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
11.3	501	\|=(% style="width: 123px;" %)(((
	502	Size (bytes)
	503	)))\|=(% style="width: 107px;" %)(((
	504	1
	505	)))\|=(% style="width: 107px;" %)(((
	506	1
	507	)))\|=(% style="width: 107px;" %)(((
	508	1
	509	)))\|=(% style="width: 107px;" %)(((
	510	1
	511	)))\|=(% style="width: 107px;" %)(((
	512	1
	513	)))\|=(% style="width: 107px;" %)(((
	514	1
	515	)))\|=(% style="width: 107px;" %)(((
	516	1
	517	)))\|=(% style="width: 107px;" %)(((
	518	1
	519	)))\|=(% style="width: 107px;" %)(((
	520	1
	521	)))
	522	\|(% style="width:123px" %)(((
	523	Value
	524	)))\|(% style="width:38px" %)(((
	525	address
	526	)))\|(% style="width:70px" %)(((
	527	request
	528	)))\|(% style="width:52px" %)(((
	529	ACK
	530	)))\|(% style="width:127px" %)(((
	531	(((
8.2	532	DI1&
11.3	533	)))
8.2	534
11.3	535	(((
8.2	536	DI1 level
11.3	537	)))
	538	)))\|(% style="width:101px" %)(((
	539	DI1TODO1
	540	)))\|(% style="width:91px" %)(((
	541	DI1TORO1
	542	)))\|(% style="width:111px" %)(((
	543	(((
8.2	544	DI2&
11.3	545	)))
8.2	546
11.3	547	(((
8.2	548	DI2 level
11.3	549	)))
	550	)))\|(% style="width:105px" %)(((
	551	DI2TODO2
	552	)))\|(% style="width:106px" %)(((
	553	DI2TORO2
	554	)))
8.2	555
11.3	556	(((
8.5	557	(% style="color:#037691" %)The first byte(%%): 00 is the broadcast address, 01-08 is the RX group number.
11.3	558	)))
8.2	559
11.3	560	(((
8.5	561	(% style="color:#037691" %)The second byte(%%): send mapping request when not 0, not request when it is 0.
11.3	562	)))
8.2	563
11.3	564	(((
8.5	565	(% style="color:#037691" %)The third byte(%%): ACK returned to the sender after the mapping is completed.
11.3	566	)))
8.2	567
11.1	568	(((
11.3	569	(((
8.5	570	(% 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	571	)))
11.3	572	)))
8.2	573
11.3	574	(((
8.6	575	(% style="color:#037691" %)The Fifth byte(%%): DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
11.3	576	)))
8.2	577
11.3	578	(((
8.5	579	(% style="color:#037691" %)The Sixth byte(%%): 0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
11.3	580	)))
8.2	581
11.1	582	(((
11.3	583	(((
8.5	584	(% 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	585	)))
11.3	586	)))
8.2	587
11.3	588	(((
8.6	589	(% style="color:#037691" %)The 8th byte(%%): DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
11.3	590	)))
8.2	591
11.3	592	(((
8.5	593	(% style="color:#037691" %)The 9th byte(%%): DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
11.3	594	)))
8.2	595
19.1	596	(((
1.1	597
19.1	598
	599	(% style="color:#4f81bd" %)Payload:（Since firmware 1.3）The receiver replies to the sent packet
	600	)))
	601
	602	(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
	603	\|=(% style="width: 123px;" %)(((
	604	Size (bytes)
	605	)))\|=(% style="width: 107px;" %)(((
	606	1
	607	)))\|=(% style="width: 107px;" %)(((
	608	1
	609	)))\|=(% style="width: 107px;" %)(((
	610	1
	611	)))\|=(% style="width: 107px;" %)(((
	612	1
	613	)))\|=(% style="width: 107px;" %)(((
	614	1
	615	)))\|=(% style="width: 107px;" %)(((
	616	1
	617	)))\|=(% style="width: 107px;" %)(((
	618	1
	619	)))\|=(% style="width: 107px;" %)(((
	620	1
	621	)))\|=(% style="width: 107px;" %)(((
	622	1
	623	)))
	624	\|(% style="width:123px" %)(((
	625	Value
	626	)))\|(% style="width:38px" %)(((
	627	address
	628	)))\|(% style="width:70px" %)(((
	629	request
	630	)))\|(% style="width:52px" %)(((
	631	ACK
	632	)))\|(% style="width:127px" %)(((
	633	(((
	634	DO1&
	635	)))
	636
	637	(((
	638	DO1 level
	639	)))
	640	)))\|(% style="width:101px" %)(((
	641	DI1TODO1
	642	)))\|(% style="width:91px" %)(((
	643	DI1TORO1
	644	)))\|(% style="width:111px" %)(((
	645	(((
	646	RO2&
	647	)))
	648
	649	(((
	650	RO2 level
	651	)))
	652	)))\|(% style="width:105px" %)(((
	653	DI2TODO2
	654	)))\|(% style="width:106px" %)(((
	655	DI2TORO2
	656	)))
	657
	658	(((
	659	(% style="color:#037691" %)The first byte(%%): 00 is the broadcast address, 01-08 is the RX group number.
	660	)))
	661
	662	(((
	663	(% style="color:#037691" %)The second byte(%%): send mapping request when not 0, not request when it is 0.
	664	)))
	665
	666	(((
	667	(% style="color:#037691" %)The third byte(%%): ACK returned to the sender after the mapping is completed.
	668	)))
	669
	670	(((
	671	(((
	672	(% 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.
	673	)))
	674	)))
	675
	676	(((
	677	(% style="color:#037691" %)The Fifth byte(%%): DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
	678	)))
	679
	680	(((
	681	(% style="color:#037691" %)The Sixth byte(%%): 0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
	682	)))
	683
	684	(((
	685	(((
	686	(% 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.
	687	)))
	688	)))
	689
	690	(((
	691	(% style="color:#037691" %)The 8th byte(%%): DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
	692	)))
	693
	694	(((
	695	(% style="color:#037691" %)The 9th byte(%%): DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
	696	)))
	697
	698

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

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