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2	2	{{toc/}}
3	3	{{/box}}
4	4
5		-= Overview =
	5	+= **1. Overview** =
6	6
	7	+(((
7	7	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:
	9	+)))
8	8
	11	+(((
9	9	[[Point to Point Software for LT-22222-L>>https://github.com/dragino/LT-22222-L]].
	13	+)))
10	10
11	11	== ==
12	12
13		-= Features for this firmware: =
	17	+= **2. Features for this firmware** =
14	14
	19	+
	20	+== **2.1  Point To Point** ==
	21	+
	22	+=== **2.1.1 Overview** ===
	23	+
	24	+
	25	+[[image:image-20220602111219-1.png||height="472" width="972"]]
	26	+
	27	+
	28	+=== **2.2.2 Configure** ===
	29	+
	30	+
	31	+(% border="1" style="background-color:#f7faff; color:black; width:500px" %)
	32	+|=**A's configuration**|=**B's configuration**
	33	+|AT+GROUPMOD=0|AT+GROUPMOD=0
	34	+|AT+TXCHS=868700000|AT+TXCHS=869000000
	35	+|AT+RXCHS=869000000|AT+RXCHS=868700000
	36	+|AT+TRIG1=2,50|AT+TRIG1=2,50
	37	+|AT+TRIG2=2,50|AT+TRIG2=2,50
	38	+|AT+DI1TODO1=2|AT+DI1TODO1=2
	39	+|AT+DI1TORO1=2|AT+DI1TORO1=2
	40	+|AT+DI2TODO2=2 |AT+DI2TODO2=2
	41	+|AT+DI2TORO2=2|AT+DI2TORO2=2
	42	+
	43	+
	44	+
	45	+=== **2.2.3 Serial port display** ===
	46	+
	47	+
	48	+(% class="wikigeneratedid" %)
	49	+[[image:image-20220602111219-2.png]]
	50	+
	51	+
	52	+(% class="wikigeneratedid" %)
	53	+[[image:image-20220602111219-3.png]]
	54	+
	55	+(% class="wikigeneratedid" %)
	56	+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.
	57	+
	58	+
	59	+== **2.2  Point To Mult-Point ** ==
	60	+
	61	+=== **2.2.1 Overview** ===
	62	+
	63	+
	64	+[[image:1654152390874-192.png]]
	65	+
	66	+
	67	+=== **2.2.2  Configure** ===
	68	+
	69	+
	70	+(% style="color:#4f81bd" %)**Configuration of the TX group:**
	71	+
	72	+AT+GROUPMOD=0,2
	73	+
	74	+AT+TXCHS=868700000
	75	+
	76	+AT+RXCHS=869000000
	77	+
	78	+AT+TRIG1=2,50
	79	+
	80	+AT+TRIG2=2,50
	81	+
	82	+AT+DI1TODO1=1
	83	+
	84	+AT+DI1TORO1=1
	85	+
	86	+AT+DI2TODO2=1
	87	+
	88	+AT+DI2TORO2=1
	89	+
	90	+
	91	+(% style="color:#4f81bd" %)**Configuration for RX group number 1:**
	92	+
	93	+AT+GROUPMOD=1,1
	94	+
	95	+AT+TXCHS=869000000
	96	+
	97	+AT+RXCHS=868700000
	98	+
	99	+
	100	+(% style="color:#4f81bd" %)**Configuration for RX group number 2:**
	101	+
	102	+AT+GROUPMOD=1,2
	103	+
	104	+AT+TXCHS=869000000
	105	+
	106	+AT+RXCHS=868700000
	107	+
	108	+
	109	+=== **2.2.3 Serial port display** ===
	110	+
	111	+
	112	+[[image:image-20220602144747-1.png]]
	113	+
	114	+
	115	+[[image:image-20220602144747-2.png]]
	116	+
	117	+(((
	118	+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.
	119	+)))
	120	+
	121	+
	122	+
	123	+
	124	+== **2.3 AT command** ==
	125	+
	126	+
	127	+(((
	128	+(% style="color:#037691" %)**ATZ** (%%)**: ** Trig a reset of the MCU
	129	+)))
	130	+
	131	+(((
	132	+(% style="color:#037691" %)**AT+FDR** (%%)**:**  Reset Parameters to Factory Default, Keys Reserve
	133	+)))
	134	+
	135	+(((
	136	+(% style="color:#037691" %)**AT+FCU** (%%)**:**  Get or Set the Frame Counter Uplink
	137	+)))
	138	+
	139	+(((
	140	+(% style="color:#037691" %)**AT+FCD** (%%)**:**  Get or Set the Frame Counter Downlink
	141	+)))
	142	+
	143	+(((
	144	+(% style="color:#037691" %)**AT+TXP** (%%)**:**  Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)
	145	+)))
	146	+
	147	+(((
	148	+(% style="color:#037691" %)**AT+SYNC** (%%)**:**  Get or Set the Sync word [1:0x34,0:0x12] (default is 1)
	149	+)))
	150	+
	151	+(((
	152	+(% style="color:#037691" %)**AT+PMB** (%%)**:    **Get or Set the preamble (default:8)
	153	+)))
	154	+
	155	+(((
	156	+(% style="color:#037691" %)**AT+TXCHS **(%%)**:** Get or Set the transmit frequency of TX (default:868700000)
	157	+)))
	158	+
	159	+(((
	160	+(% style="color:#037691" %)**AT+TXSF **(%%)**:**  Get or Set the spreading factor of TX (7 to 12) (default:12)
	161	+)))
	162	+
	163	+(((
	164	+(% style="color:#037691" %)**AT+RXCHS **(%%)**:** Get or Set the transmit frequency of RX (default:869000000)
	165	+)))
	166	+
	167	+(((
	168	+(% style="color:#037691" %)**AT+RXSF **(%%)**:**  Get or Set the spreading factor of RX (7 to 12) (default:12)
	169	+)))
	170	+
	171	+(((
	172	+(% style="color:#037691" %)**AT+BW **(%%)**:       **Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)
	173	+)))
	174	+
	175	+(((
	176	+(% 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)
	177	+)))
	178	+
	179	+(((
	180	+(% style="color:#037691" %)**AT+TDC **(%%)**:**  Get or set the application data transmission interval in ms(default 10 minutes)
	181	+)))
	182	+
	183	+(((
	184	+(% style="color:#037691" %)**AT+VER **(%%)**:**  Get firmware version number
	185	+)))
	186	+
	187	+(((
	188	+(% style="color:#037691" %)**AT+SEND **(%%)**:   **Set Custom sent hex data
	189	+)))
	190	+
	191	+(((
	192	+(% style="color:#037691" %)**AT+GROUPMOD **(%%)**: **Set or Get the grouping mode of the device (default: 0)
	193	+)))
	194	+
	195	+(((
	196	+(((
	197	+(% 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)
	198	+)))
	199	+)))
	200	+
	201	+(((
	202	+(% style="color:#037691" %)**AT+TRIG1 **(%%)**:**  Set or Get the DI1 pin interrupt trigger mode (default 0,0)
	203	+)))
	204	+
	205	+(((
	206	+(% style="color:#037691" %)**AT+TRIG2 **(%%)**:            **Set or Get the DI2 pin interrupt trigger mode (default 0,0)
	207	+)))
	208	+
	209	+(((
	210	+(% style="color:#037691" %)**AT+DI1TODO1 **(%%)**:    **Set or get the mode in which DI1 maps to DO1 (default 0)
	211	+)))
	212	+
	213	+(((
	214	+(% style="color:#037691" %)**AT+DI1TORO1 **(%%)**:    **Set or get the mode in which DI1 maps to RO1(default 0)
	215	+)))
	216	+
	217	+(((
	218	+(% style="color:#037691" %)**AT+DI2TODO2 **(%%)**:**  Set or get the mode in which DI2 maps to DO2(default 0)
	219	+)))
	220	+
	221	+(((
	222	+(% style="color:#037691" %)**AT+DI2TORO2 **(%%)**:    **Set or get the mode in which DI2 maps to RO2(default 0)
	223	+)))
	224	+
	225	+(((
15	15
	227	+)))
	228	+
	229	+(((
	230	+
	231	+)))
	232	+
	233	+(((
	234	+(% style="color:#4f81bd" %)**Example 1:**
	235	+)))
	236	+
	237	+(((
	238	+**AT+SEND=01020304 **will send a payload of 01020304
	239	+)))
	240	+
	241	+(((
	242	+
	243	+)))
	244	+
	245	+(((
	246	+(% style="color:#4f81bd" %)**Example 2: **
	247	+)))
	248	+
	249	+(((
	250	+**AT+TRIGx=a    **Trigger directly without triggering time
	251	+)))
	252	+
	253	+(((
	254	+**AT+TRIGx=a,b**
	255	+)))
	256	+
	257	+(((
	258	+a=0: falling edge;
	259	+)))
	260	+
	261	+(((
	262	+a=1: rising edge;
	263	+)))
	264	+
	265	+(((
	266	+a=2: falling edge or rising edge;
	267	+)))
	268	+
	269	+(((
	270	+b:  triggering time in milliseconds.
	271	+)))
	272	+
	273	+(((
	274	+AT+TRIGx=2,50  Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
	275	+)))
	276	+
	277	+(((
	278	+
	279	+)))
	280	+
	281	+(((
	282	+(% style="color:#4f81bd" %)**Example 3: **
	283	+)))
	284	+
	285	+(((
	286	+**AT+DI1TODO1= maps value**
	287	+)))
	288	+
	289	+(((
	290	+**AT+DI1TORO1= maps value**
	291	+)))
	292	+
	293	+(((
	294	+**AT+DI2TODO2= maps value**
	295	+)))
	296	+
	297	+(((
	298	+**AT+DI2TORO2= maps value**
	299	+)))
	300	+
	301	+(((
	302	+
	303	+)))
	304	+
	305	+(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
	306	+|=(% style="width: 102px;" %)(((
	307	+Maps value
	308	+)))|=(% style="width: 331px;" %)(((
	309	+DIx to DOx
	310	+)))|=(% style="width: 268px;" %)(((
	311	+DIx to ROx
	312	+)))
	313	+|(% style="width:102px" %)(((
	314	+0
	315	+)))|(% style="width:331px" %)(((
	316	+No Action
	317	+)))|(% style="width:268px" %)(((
	318	+No Action
	319	+)))
	320	+|(% style="width:102px" %)(((
	321	+1
	322	+)))|(% style="width:331px" %)(((
	323	+If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level
	324	+)))|(% style="width:268px" %)(((
	325	+(((
	326	+If DIx is high, control ROx to close,
	327	+)))
	328	+
	329	+(((
	330	+if DIx is low, control ROx to open
	331	+)))
	332	+)))
	333	+|(% style="width:102px" %)(((
	334	+2
	335	+)))|(% style="width:331px" %)(((
	336	+If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level
	337	+)))|(% style="width:268px" %)(((
	338	+(((
	339	+If DIx is high, control ROx to open,
	340	+)))
	341	+
	342	+(((
	343	+if DIx is low, control ROx to close
	344	+)))
	345	+)))
	346	+|(% style="width:102px" %)(((
	347	+3
	348	+)))|(% style="width:331px" %)(((
	349	+DOx state flip
	350	+)))|(% style="width:268px" %)(((
	351	+ROx state flip
	352	+)))
	353	+
	354	+(((
	355	+(% style="color:#4f81bd" %)**Example 4: **
	356	+)))
	357	+
	358	+(((
	359	+**AT+GROUPMOD=0**  Set to point to point mode
	360	+)))
	361	+
	362	+(((
	363	+**AT+GROUPMOD=0,aa**  Set the TX group that controls the number of aa (The maximum value of aa is 8)
	364	+)))
	365	+
	366	+(((
	367	+(((
	368	+**AT+GROUPMOD=1,bb**  Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8)
	369	+)))
	370	+)))
	371	+
	372	+(((
	373	+**AT+GROUPMOD=0,2**  Set to control the TX group of the two RX groups
	374	+)))
	375	+
	376	+(((
	377	+**AT+GROUPMOD=1,1**  Set the RX group numbered 1
	378	+)))
	379	+
	380	+(((
	381	+**AT+GROUPMOD=1,2**  Set the RX group numbered 2
	382	+)))
	383	+
	384	+
	385	+== **2.4 Data Format** ==
	386	+
	387	+(((
	388	+8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
	389	+)))
	390	+
	391	+(((
	392	+
	393	+)))
	394	+
	395	+(((
	396	+(% style="color:#4f81bd" %)**Payload:**
	397	+)))
	398	+
	399	+(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
	400	+|=(% style="width: 123px;" %)(((
	401	+**Size (bytes)**
	402	+)))|=(% style="width: 107px;" %)(((
	403	+1
	404	+)))|=(% style="width: 107px;" %)(((
	405	+1
	406	+)))|=(% style="width: 107px;" %)(((
	407	+1
	408	+)))|=(% style="width: 107px;" %)(((
	409	+1
	410	+)))|=(% style="width: 107px;" %)(((
	411	+1
	412	+)))|=(% style="width: 107px;" %)(((
	413	+1
	414	+)))|=(% style="width: 107px;" %)(((
	415	+1
	416	+)))|=(% style="width: 107px;" %)(((
	417	+1
	418	+)))|=(% style="width: 107px;" %)(((
	419	+1
	420	+)))
	421	+|(% style="width:123px" %)(((
	422	+**Value**
	423	+)))|(% style="width:38px" %)(((
	424	+address
	425	+)))|(% style="width:70px" %)(((
	426	+request
	427	+)))|(% style="width:52px" %)(((
	428	+ACK
	429	+)))|(% style="width:127px" %)(((
	430	+(((
	431	+DI1&
	432	+)))
	433	+
	434	+(((
	435	+DI1 level
	436	+)))
	437	+)))|(% style="width:101px" %)(((
	438	+DI1TODO1
	439	+)))|(% style="width:91px" %)(((
	440	+DI1TORO1
	441	+)))|(% style="width:111px" %)(((
	442	+(((
	443	+DI2&
	444	+)))
	445	+
	446	+(((
	447	+DI2 level
	448	+)))
	449	+)))|(% style="width:105px" %)(((
	450	+DI2TODO2
	451	+)))|(% style="width:106px" %)(((
	452	+DI2TORO2
	453	+)))
	454	+
	455	+(((
	456	+(% style="color:#037691" %)**The first byte**(%%)**:**  00 is the broadcast address, 01-08 is the RX group number.
	457	+)))
	458	+
	459	+(((
	460	+(% style="color:#037691" %)**The second byte**(%%)**:**  send mapping request when not 0, not request when it is 0.
	461	+)))
	462	+
	463	+(((
	464	+(% style="color:#037691" %)**The third byte**(%%)**:**  ACK returned to the sender after the mapping is completed.
	465	+)))
	466	+
	467	+(((
	468	+(((
	469	+(% 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.
	470	+)))
	471	+)))
	472	+
	473	+(((
	474	+(% style="color:#037691" %)**The Fifth byte**(%%)**:       **DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
	475	+)))
	476	+
	477	+(((
	478	+(% style="color:#037691" %)**The Sixth byte**(%%)**:**  0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
	479	+)))
	480	+
	481	+(((
	482	+(((
	483	+(% 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.
	484	+)))
	485	+)))
	486	+
	487	+(((
	488	+(% style="color:#037691" %)**The 8th byte**(%%)**:          **DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
	489	+)))
	490	+
	491	+(((
	492	+(% style="color:#037691" %)**The 9th byte**(%%)**:**  DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
	493	+)))
	494	+
	495	+

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