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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	+[[image:image-20220602111219-1.png||height="472" width="972"]]
	25	+
	26	+
	27	+=== **2.2.2 Configure** ===
	28	+
	29	+
	30	+(% border="1" style="background-color:#f7faff; color:black; width:500px" %)
	31	+|=**A's configuration**|=**B's configuration**
	32	+|AT+GROUPMOD=0|AT+GROUPMOD=0
	33	+|AT+TXCHS=868700000|AT+TXCHS=869000000
	34	+|AT+RXCHS=869000000|AT+RXCHS=868700000
	35	+|AT+TRIG1=2,50|AT+TRIG1=2,50
	36	+|AT+TRIG2=2,50|AT+TRIG2=2,50
	37	+|AT+DI1TODO1=2|AT+DI1TODO1=2
	38	+|AT+DI1TORO1=2|AT+DI1TORO1=2
	39	+|AT+DI2TODO2=2 |AT+DI2TODO2=2
	40	+|AT+DI2TORO2=2|AT+DI2TORO2=2
	41	+
	42	+
	43	+
	44	+=== **2.2.3 Serial port display** ===
	45	+
	46	+
	47	+(% class="wikigeneratedid" %)
	48	+[[image:image-20220602111219-2.png]]
	49	+
	50	+
	51	+(% class="wikigeneratedid" %)
	52	+[[image:image-20220602111219-3.png]]
	53	+
	54	+(% class="wikigeneratedid" %)
	55	+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.
	56	+
	57	+
	58	+== **2.2  Point To Mult-Point ** ==
	59	+
	60	+=== **2.2.1 Overview** ===
	61	+
	62	+
	63	+[[image:1654152390874-192.png]]
	64	+
	65	+
	66	+=== **2.2.2  Configure** ===
	67	+
	68	+
	69	+(% style="color:#4f81bd" %)**Configuration of the TX group:**
	70	+
	71	+AT+GROUPMOD=0,2
	72	+
	73	+AT+TXCHS=868700000
	74	+
	75	+AT+RXCHS=869000000
	76	+
	77	+AT+TRIG1=2,50
	78	+
	79	+AT+TRIG2=2,50
	80	+
	81	+AT+DI1TODO1=1
	82	+
	83	+AT+DI1TORO1=1
	84	+
	85	+AT+DI2TODO2=1
	86	+
	87	+AT+DI2TORO2=1
	88	+
	89	+
	90	+(% style="color:#4f81bd" %)**Configuration for RX group number 1:**
	91	+
	92	+AT+GROUPMOD=1,1
	93	+
	94	+AT+TXCHS=869000000
	95	+
	96	+AT+RXCHS=868700000
	97	+
	98	+
	99	+(% style="color:#4f81bd" %)**Configuration for RX group number 2:**
	100	+
	101	+AT+GROUPMOD=1,2
	102	+
	103	+AT+TXCHS=869000000
	104	+
	105	+AT+RXCHS=868700000
	106	+
	107	+
	108	+=== **2.2.3 Serial port display** ===
	109	+
	110	+
	111	+[[image:image-20220602144747-1.png]]
	112	+
	113	+
	114	+[[image:image-20220602144747-2.png]]
	115	+
	116	+(((
	117	+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.
	118	+)))
	119	+
	120	+
	121	+
	122	+
	123	+== **2.3 AT command** ==
	124	+
	125	+
	126	+(((
	127	+(% style="color:#037691" %)**ATZ** (%%)**: ** Trig a reset of the MCU
	128	+)))
	129	+
	130	+(((
	131	+(% style="color:#037691" %)**AT+FDR** (%%)**:**  Reset Parameters to Factory Default, Keys Reserve
	132	+)))
	133	+
	134	+(((
	135	+(% style="color:#037691" %)**AT+FCU** (%%)**:**  Get or Set the Frame Counter Uplink
	136	+)))
	137	+
	138	+(((
	139	+(% style="color:#037691" %)**AT+FCD** (%%)**:**  Get or Set the Frame Counter Downlink
	140	+)))
	141	+
	142	+(((
	143	+(% style="color:#037691" %)**AT+TXP** (%%)**:**  Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)
	144	+)))
	145	+
	146	+(((
	147	+(% style="color:#037691" %)**AT+SYNC** (%%)**:**  Get or Set the Sync word [1:0x34,0:0x12] (default is 1)
	148	+)))
	149	+
	150	+(((
	151	+(% style="color:#037691" %)**AT+PMB** (%%)**:    **Get or Set the preamble (default:8)
	152	+)))
	153	+
	154	+(((
	155	+(% style="color:#037691" %)**AT+TXCHS **(%%)**:** Get or Set the transmit frequency of TX (default:868700000)
	156	+)))
	157	+
	158	+(((
	159	+(% style="color:#037691" %)**AT+TXSF **(%%)**:**  Get or Set the spreading factor of TX (7 to 12) (default:12)
	160	+)))
	161	+
	162	+(((
	163	+(% style="color:#037691" %)**AT+RXCHS **(%%)**:** Get or Set the transmit frequency of RX (default:869000000)
	164	+)))
	165	+
	166	+(((
	167	+(% style="color:#037691" %)**AT+RXSF **(%%)**:**  Get or Set the spreading factor of RX (7 to 12) (default:12)
	168	+)))
	169	+
	170	+(((
	171	+(% style="color:#037691" %)**AT+BW **(%%)**:       **Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)
	172	+)))
	173	+
	174	+(((
	175	+(% 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)
	176	+)))
	177	+
	178	+(((
	179	+(% style="color:#037691" %)**AT+TDC **(%%)**:**  Get or set the application data transmission interval in ms(default 10 minutes)
	180	+)))
	181	+
	182	+(((
	183	+(% style="color:#037691" %)**AT+VER **(%%)**:**  Get firmware version number
	184	+)))
	185	+
	186	+(((
	187	+(% style="color:#037691" %)**AT+SEND **(%%)**:   **Set Custom sent hex data
	188	+)))
	189	+
	190	+(((
	191	+(% style="color:#037691" %)**AT+GROUPMOD **(%%)**: **Set or Get the grouping mode of the device (default: 0)
	192	+)))
	193	+
	194	+(((
	195	+(((
	196	+(% 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)
	197	+)))
	198	+)))
	199	+
	200	+(((
	201	+(% style="color:#037691" %)**AT+TRIG1 **(%%)**:**  Set or Get the DI1 pin interrupt trigger mode (default 0,0)
	202	+)))
	203	+
	204	+(((
	205	+(% style="color:#037691" %)**AT+TRIG2 **(%%)**:            **Set or Get the DI2 pin interrupt trigger mode (default 0,0)
	206	+)))
	207	+
	208	+(((
	209	+(% style="color:#037691" %)**AT+DI1TODO1 **(%%)**:    **Set or get the mode in which DI1 maps to DO1 (default 0)
	210	+)))
	211	+
	212	+(((
	213	+(% style="color:#037691" %)**AT+DI1TORO1 **(%%)**:    **Set or get the mode in which DI1 maps to RO1(default 0)
	214	+)))
	215	+
	216	+(((
	217	+(% style="color:#037691" %)**AT+DI2TODO2 **(%%)**:**  Set or get the mode in which DI2 maps to DO2(default 0)
	218	+)))
	219	+
	220	+(((
	221	+(% style="color:#037691" %)**AT+DI2TORO2 **(%%)**:    **Set or get the mode in which DI2 maps to RO2(default 0)
	222	+)))
	223	+
	224	+(((
15	15
	226	+)))
	227	+
	228	+(((
	229	+
	230	+)))
	231	+
	232	+(((
	233	+(% style="color:#4f81bd" %)**Example 1:**
	234	+)))
	235	+
	236	+(((
	237	+**AT+SEND=01020304 **will send a payload of 01020304
	238	+)))
	239	+
	240	+(((
	241	+
	242	+)))
	243	+
	244	+(((
	245	+(% style="color:#4f81bd" %)**Example 2: **
	246	+)))
	247	+
	248	+(((
	249	+**AT+TRIGx=a    **Trigger directly without triggering time
	250	+)))
	251	+
	252	+(((
	253	+**AT+TRIGx=a,b**
	254	+)))
	255	+
	256	+(((
	257	+a=0: falling edge;
	258	+)))
	259	+
	260	+(((
	261	+a=1: rising edge;
	262	+)))
	263	+
	264	+(((
	265	+a=2: falling edge or rising edge;
	266	+)))
	267	+
	268	+(((
	269	+b:  triggering time in milliseconds.
	270	+)))
	271	+
	272	+(((
	273	+AT+TRIGx=2,50  Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
	274	+)))
	275	+
	276	+(((
	277	+
	278	+)))
	279	+
	280	+(((
	281	+(% style="color:#4f81bd" %)**Example 3: **
	282	+)))
	283	+
	284	+(((
	285	+**AT+DI1TODO1= maps value**
	286	+)))
	287	+
	288	+(((
	289	+**AT+DI1TORO1= maps value**
	290	+)))
	291	+
	292	+(((
	293	+**AT+DI2TODO2= maps value**
	294	+)))
	295	+
	296	+(((
	297	+**AT+DI2TORO2= maps value**
	298	+)))
	299	+
	300	+(((
	301	+
	302	+)))
	303	+
	304	+(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
	305	+|=(% style="width: 102px;" %)(((
	306	+Maps value
	307	+)))|=(% style="width: 331px;" %)(((
	308	+DIx to DOx
	309	+)))|=(% style="width: 268px;" %)(((
	310	+DIx to ROx
	311	+)))
	312	+|(% style="width:102px" %)(((
	313	+0
	314	+)))|(% style="width:331px" %)(((
	315	+No Action
	316	+)))|(% style="width:268px" %)(((
	317	+No Action
	318	+)))
	319	+|(% style="width:102px" %)(((
	320	+1
	321	+)))|(% style="width:331px" %)(((
	322	+If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level
	323	+)))|(% style="width:268px" %)(((
	324	+(((
	325	+If DIx is high, control ROx to close,
	326	+)))
	327	+
	328	+(((
	329	+if DIx is low, control ROx to open
	330	+)))
	331	+)))
	332	+|(% style="width:102px" %)(((
	333	+2
	334	+)))|(% style="width:331px" %)(((
	335	+If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level
	336	+)))|(% style="width:268px" %)(((
	337	+(((
	338	+If DIx is high, control ROx to open,
	339	+)))
	340	+
	341	+(((
	342	+if DIx is low, control ROx to close
	343	+)))
	344	+)))
	345	+|(% style="width:102px" %)(((
	346	+3
	347	+)))|(% style="width:331px" %)(((
	348	+DOx state flip
	349	+)))|(% style="width:268px" %)(((
	350	+ROx state flip
	351	+)))
	352	+
	353	+(((
	354	+(% style="color:#4f81bd" %)**Example 4: **
	355	+)))
	356	+
	357	+(((
	358	+**AT+GROUPMOD=0**  Set to point to point mode
	359	+)))
	360	+
	361	+(((
	362	+**AT+GROUPMOD=0,aa**  Set the TX group that controls the number of aa (The maximum value of aa is 8)
	363	+)))
	364	+
	365	+(((
	366	+(((
	367	+**AT+GROUPMOD=1,bb**  Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8)
	368	+)))
	369	+)))
	370	+
	371	+(((
	372	+**AT+GROUPMOD=0,2**  Set to control the TX group of the two RX groups
	373	+)))
	374	+
	375	+(((
	376	+**AT+GROUPMOD=1,1**  Set the RX group numbered 1
	377	+)))
	378	+
	379	+(((
	380	+**AT+GROUPMOD=1,2**  Set the RX group numbered 2
	381	+)))
	382	+
	383	+
	384	+== **2.4 Data Format** ==
	385	+
	386	+(((
	387	+8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
	388	+)))
	389	+
	390	+(((
	391	+
	392	+)))
	393	+
	394	+(((
	395	+(% style="color:#4f81bd" %)**Payload:**
	396	+)))
	397	+
	398	+(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
	399	+|=(% style="width: 123px;" %)(((
	400	+**Size (bytes)**
	401	+)))|=(% style="width: 107px;" %)(((
	402	+1
	403	+)))|=(% style="width: 107px;" %)(((
	404	+1
	405	+)))|=(% style="width: 107px;" %)(((
	406	+1
	407	+)))|=(% style="width: 107px;" %)(((
	408	+1
	409	+)))|=(% style="width: 107px;" %)(((
	410	+1
	411	+)))|=(% style="width: 107px;" %)(((
	412	+1
	413	+)))|=(% style="width: 107px;" %)(((
	414	+1
	415	+)))|=(% style="width: 107px;" %)(((
	416	+1
	417	+)))|=(% style="width: 107px;" %)(((
	418	+1
	419	+)))
	420	+|(% style="width:123px" %)(((
	421	+**Value**
	422	+)))|(% style="width:38px" %)(((
	423	+address
	424	+)))|(% style="width:70px" %)(((
	425	+request
	426	+)))|(% style="width:52px" %)(((
	427	+ACK
	428	+)))|(% style="width:127px" %)(((
	429	+(((
	430	+DI1&
	431	+)))
	432	+
	433	+(((
	434	+DI1 level
	435	+)))
	436	+)))|(% style="width:101px" %)(((
	437	+DI1TODO1
	438	+)))|(% style="width:91px" %)(((
	439	+DI1TORO1
	440	+)))|(% style="width:111px" %)(((
	441	+(((
	442	+DI2&
	443	+)))
	444	+
	445	+(((
	446	+DI2 level
	447	+)))
	448	+)))|(% style="width:105px" %)(((
	449	+DI2TODO2
	450	+)))|(% style="width:106px" %)(((
	451	+DI2TORO2
	452	+)))
	453	+
	454	+(((
	455	+(% style="color:#037691" %)**The first byte**(%%)**:**  00 is the broadcast address, 01-08 is the RX group number.
	456	+)))
	457	+
	458	+(((
	459	+(% style="color:#037691" %)**The second byte**(%%)**:**  send mapping request when not 0, not request when it is 0.
	460	+)))
	461	+
	462	+(((
	463	+(% style="color:#037691" %)**The third byte**(%%)**:**  ACK returned to the sender after the mapping is completed.
	464	+)))
	465	+
	466	+(((
	467	+(((
	468	+(% 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.
	469	+)))
	470	+)))
	471	+
	472	+(((
	473	+(% style="color:#037691" %)**The Fifth byte**(%%)**:       **DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
	474	+)))
	475	+
	476	+(((
	477	+(% style="color:#037691" %)**The Sixth byte**(%%)**:**  0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
	478	+)))
	479	+
	480	+(((
	481	+(((
	482	+(% 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.
	483	+)))
	484	+)))
	485	+
	486	+(((
	487	+(% style="color:#037691" %)**The 8th byte**(%%)**:          **DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
	488	+)))
	489	+
	490	+(((
	491	+(% style="color:#037691" %)**The 9th byte**(%%)**:**  DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
	492	+)))
	493	+
	494	+

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