Changes for page Point to Point Communication of LT-22222-L
Last modified by Edwin Chen on 2022/11/22 09:38
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... ... @@ -2,199 +2,14 @@ 2 2 {{toc/}} 3 3 {{/box}} 4 4 5 -= **1.Overview**=5 += Overview = 6 6 7 -((( 8 8 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 -))) 10 10 11 -((( 12 12 [[Point to Point Software for LT-22222-L>>https://github.com/dragino/LT-22222-L]]. 13 -))) 14 14 15 15 == == 16 16 17 -= **2.Features for this firmware**=13 += Features for this firmware: = 18 18 19 - 20 -== **2.1 Point To Point** == 21 - 22 - 23 -[[image:image-20220602111219-1.png||height="472" width="972"]] 24 - 25 - 26 -(% class="wikigeneratedid" id="H2.2.Configure" %) 27 -(% style="color:blue" %)**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 -== **2.2 Point To Mult-Point ** == 43 - 44 - 45 -[[image:image-20220602111219-2.png]] 46 - 47 - 48 -[[image:image-20220602111219-3.png]] 49 - 50 -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. 51 - 52 - 53 -== **2.3 AT command** == 54 - 55 - 56 -(% style="color:#037691" %)**ATZ** (%%)**: ** Trig a reset of the MCU 57 - 58 -(% style="color:#037691" %)**AT+FDR** (%%)**:** Reset Parameters to Factory Default, Keys Reserve 59 - 60 -(% style="color:#037691" %)**AT+FCU** (%%)**:** Get or Set the Frame Counter Uplink 61 - 62 -(% style="color:#037691" %)**AT+FCD** (%%)**:** Get or Set the Frame Counter Downlink 63 - 64 -(% style="color:#037691" %)**AT+TXP** (%%)**:** Get or Set the transmit power, the maximum is 20dBm (default is 14dBm) 65 - 66 -(% style="color:#037691" %)**AT+SYNC** (%%)**:** Get or Set the Sync word [1:0x34,0:0x12] (default is 1) 67 - 68 -(% style="color:#037691" %)**AT+PMB** (%%)**: **Get or Set the preamble (default:8) 69 - 70 -(% style="color:#037691" %)**AT+TXCHS **(%%)**:** Get or Set the transmit frequency of TX (default:868700000) 71 - 72 -(% style="color:#037691" %)**AT+TXSF **(%%)**:** Get or Set the spreading factor of TX (7 to 12) (default:12) 73 - 74 -(% style="color:#037691" %)**AT+RXCHS **(%%)**:** Get or Set the transmit frequency of RX (default:869000000) 75 - 76 -(% style="color:#037691" %)**AT+RXSF **(%%)**:** Get or Set the spreading factor of RX (7 to 12) (default:12) 77 - 78 -(% style="color:#037691" %)**AT+BW **(%%)**: **Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0) 79 - 80 -(% 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) 81 - 82 -(% style="color:#037691" %)**AT+TDC **(%%)**:** Get or set the application data transmission interval in ms(default 10 minutes) 83 - 84 -(% style="color:#037691" %)**AT+VER **(%%)**:** Get firmware version number 85 - 86 -(% style="color:#037691" %)**AT+SEND **(%%)**: **Set Custom sent hex data 87 - 88 -(% style="color:#037691" %)**AT+GROUPMOD **(%%)**: **Set or Get the grouping mode of the device (default: 0) 89 - 90 -(% 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) 91 - 92 -(% style="color:#037691" %)**AT+TRIG1 **(%%)**:** Set or Get the DI1 pin interrupt trigger mode (default 0,0) 93 - 94 -(% style="color:#037691" %)**AT+TRIG2 **(%%)**: **Set or Get the DI2 pin interrupt trigger mode (default 0,0) 95 - 96 -(% style="color:#037691" %)**AT+DI1TODO1 **(%%)**: **Set or get the mode in which DI1 maps to DO1 (default 0) 97 - 98 -(% style="color:#037691" %)**AT+DI1TORO1 **(%%)**: **Set or get the mode in which DI1 maps to RO1(default 0) 99 - 100 -(% style="color:#037691" %)**AT+DI2TODO2 **(%%)**:** Set or get the mode in which DI2 maps to DO2(default 0) 101 - 102 -(% style="color:#037691" %)**AT+DI2TORO2 **(%%)**: **Set or get the mode in which DI2 maps to RO2(default 0) 103 - 104 - 105 - 106 -**Example1:** AT+SEND=01020304 will send a payload of 01020304 107 - 108 - 109 -i.g. AT+TRIGx=a Trigger directly without triggering time 110 - 111 -AT+TRIGx=a,b a=0, falling edge; 112 - 113 -a=1, rising edge; 114 - 115 - a=2, falling edge or rising edge. 116 - 117 - b, triggering time in milliseconds 118 - 119 - AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms 120 - 121 - 122 -i.g. AT+DI1TODO1= maps value 123 - 124 - AT+DI1TORO1= maps value 125 - 126 -AT+DI2TODO2= maps value 127 - 128 -AT+DI2TORO2= maps value 129 - 130 - 131 - 132 - 133 -(% border="1" style="background-color:#f7faff; color:black; width:706px" %) 134 -|=(% style="width: 102px;" %)Maps value|=(% style="width: 331px;" %)DIx to DOx|=(% style="width: 268px;" %)DIx to ROx 135 -|(% style="width:102px" %)0|(% style="width:331px" %)No Action|(% style="width:268px" %)No Action 136 -|(% style="width:102px" %)1|(% style="width:331px" %)If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level|(% style="width:268px" %)((( 137 -If DIx is high, control ROx to close, 138 - 139 -if DIx is low, control ROx to open 140 -))) 141 -|(% style="width:102px" %)2|(% style="width:331px" %)If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level|(% style="width:268px" %)((( 142 -If DIx is high, control ROx to open, 143 - 144 -if DIx is low, control ROx to close 145 -))) 146 -|(% style="width:102px" %)3|(% style="width:331px" %)DOx state flip|(% style="width:268px" %)ROx state flip 147 - 148 -i.g. AT+GROUPMOD=0 Set to point to point mode 149 - 150 -AT+GROUPMOD=0,aa Set the TX group that controls the number of aa (The maximum value of aa is 8) 151 - 152 -AT+GROUPMOD=1,bb Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8) 153 - 154 - 155 -AT+GROUPMOD=0,2 Set to control the TX group of the two RX groups 156 - 157 -AT+GROUPMOD=1,1 Set the RX group numbered 1 158 - 159 -AT+GROUPMOD=1,2 Set the RX group numbered 2 160 - 161 - 162 - 163 -== **2.4 Data Format** == 164 - 165 -8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum 166 - 167 - 168 -**Payload:** 169 - 170 -(% border="1" style="background-color:#f7faff; color:black; width:938px" %) 171 -|=(% style="width: 123px;" %)**Size (bytes)**|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1 172 -|(% style="width:123px" %)**Value**|(% style="width:38px" %)address|(% style="width:70px" %)request|(% style="width:52px" %)ACK|(% style="width:127px" %)((( 173 -DI1& 174 - 175 -DI1 level 176 -)))|(% style="width:101px" %)DI1TODO1|(% style="width:91px" %)DI1TORO1|(% style="width:111px" %)((( 177 -DI2& 178 - 179 -DI2 level 180 -)))|(% style="width:105px" %)DI2TODO2|(% style="width:106px" %)DI2TORO2 181 - 182 -(% style="color:#037691" %)**The first byte**(%%)**:** 00 is the broadcast address, 01-08 is the RX group number. 183 - 184 -(% style="color:#037691" %)**The second byte**(%%)**:** send mapping request when not 0, not request when it is 0. 185 - 186 -(% style="color:#037691" %)**The third byte**(%%)**:** ACK returned to the sender after the mapping is completed. 187 - 188 -(% 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. 189 - 190 -(% style="color:#037691" %)**The Fifth byte**(%%)**: **DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered. 191 - 192 -(% style="color:#037691" %)**The Sixth byte**(%%)**:** 0 does not trigger interrupt when DI1TORO1 interrupt is triggered. 193 - 194 -(% 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. 195 - 196 -(% style="color:#037691" %)**The 8th byte**(%%)**: **DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered. 197 - 198 -(% style="color:#037691" %)**The 9th byte**(%%)**:** DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered. 199 - 200 200