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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... ... @@ -2,14 +2,203 @@ 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 + 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 + 43 + 44 +== **2.2 Point To Mult-Point ** == 45 + 46 + 47 +[[image:image-20220602111219-2.png]] 48 + 49 + 50 +[[image:image-20220602111219-3.png]] 51 + 52 +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. 53 + 54 + 55 +== **2.3 AT command** == 56 + 57 + 58 +ATZ : Trig a reset of the MCU 59 + 60 +AT+FDR : Reset Parameters to Factory Default, Keys Reserve 61 + 62 +AT+FCU : Get or Set the Frame Counter Uplink 63 + 64 +AT+FCD : Get or Set the Frame Counter Downlink 65 + 66 +AT+TXP : Get or Set the transmit power, the maximum is 20dBm (default is 14dBm) 67 + 68 +AT+SYNC : Get or Set the Sync word [1:0x34,0:0x12] (default is 1) 69 + 70 +AT+PMB : Get or Set the preamble (default:8) 71 + 72 +AT+TXCHS : Get or Set the transmit frequency of TX (default:868700000) 73 + 74 +AT+TXSF : Get or Set the spreading factor of TX (7 to 12) (default:12) 75 + 76 +AT+RXCHS : Get or Set the transmit frequency of RX (default:869000000) 77 + 78 +AT+RXSF : Get or Set the spreading factor of RX (7 to 12) (default:12) 79 + 80 +AT+BW : Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0) 81 + 82 +AT+CR : Get or Set the coding rate [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8] (default:1) 83 + 84 +AT+TDC : Get or set the application data transmission interval in ms(default 10 minutes) 85 + 86 +AT+VER : Get firmware version number 87 + 88 +AT+SEND : Set Custom sent hex data 89 + 90 +AT+GROUPMOD : Set or Get the grouping mode of the device (default: 0) 91 + 92 +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) 93 + 94 +AT+TRIG1 : Set or Get the DI1 pin interrupt trigger mode (default 0,0) 95 + 96 +AT+TRIG2 : Set or Get the DI2 pin interrupt trigger mode (default 0,0) 97 + 98 +AT+DI1TODO1 : Set or get the mode in which DI1 maps to DO1 (default 0) 99 + 100 +AT+DI1TORO1 : Set or get the mode in which DI1 maps to RO1(default 0) 101 + 102 +AT+DI2TODO2 : Set or get the mode in which DI2 maps to DO2(default 0) 103 + 104 +AT+DI2TORO2 : Set or get the mode in which DI2 maps to RO2(default 0) 105 + 106 + 107 + 108 +**Example1:** AT+SEND=01020304 will send a payload of 01020304 109 + 110 + 111 +i.g. AT+TRIGx=a Trigger directly without triggering time 112 + 113 +AT+TRIGx=a,b a=0, falling edge; 114 + 115 +a=1, rising edge; 116 + 117 + a=2, falling edge or rising edge. 118 + 119 + b, triggering time in milliseconds 120 + 121 + AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms 122 + 123 + 124 +i.g. AT+DI1TODO1= maps value 125 + 126 + AT+DI1TORO1= maps value 127 + 128 +AT+DI2TODO2= maps value 129 + 130 +AT+DI2TORO2= maps value 131 + 132 + 133 + 134 + 135 +(% style="width:706px" %) 136 +|(% style="width:102px" %)Maps value|(% style="width:331px" %)DIx to DOx|(% style="width:268px" %)DIx to ROx 137 +|(% style="width:102px" %)0|(% style="width:331px" %)No Action|(% style="width:268px" %)No Action 138 +|(% 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" %)((( 139 +If DIx is high, control ROx to close, 140 + 141 +if DIx is low, control ROx to open 142 +))) 143 +|(% 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" %)((( 144 +If DIx is high, control ROx to open, 145 + 146 +if DIx is low, control ROx to close 147 +))) 148 +|(% style="width:102px" %)3|(% style="width:331px" %)DOx state flip|(% style="width:268px" %)ROx state flip 149 + 150 +i.g. AT+GROUPMOD=0 Set to point to point mode 151 + 152 +AT+GROUPMOD=0,aa Set the TX group that controls the number of aa (The maximum value of aa is 8) 153 + 154 +AT+GROUPMOD=1,bb Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8) 155 + 156 + 157 +AT+GROUPMOD=0,2 Set to control the TX group of the two RX groups 158 + 159 +AT+GROUPMOD=1,1 Set the RX group numbered 1 160 + 161 +AT+GROUPMOD=1,2 Set the RX group numbered 2 162 + 163 + 164 + 165 +== **2.4 Data Format** == 166 + 167 +8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum 168 + 169 + 170 +Payload: 171 + 172 +|**Size (bytes)**|(% colspan="2" %)**1**|(% colspan="2" %)**1**|(% colspan="2" %)**1**|(% colspan="2" %)**1**|**1** 173 +|**Value**|(% colspan="2" %)address|(% colspan="2" %)request|(% colspan="2" %)ACK|(% colspan="2" %)((( 174 +DI1& 175 + 176 +DI1 level 177 +)))|DI1TODO1 178 +|(% colspan="2" %)**1**|(% colspan="2" %)**1**|(% colspan="2" %)**1**|(% colspan="2" %)**1**|(% colspan="2" %) 179 +|(% colspan="2" %)DI1TORO1|(% colspan="2" %)((( 180 +DI2& 181 + 182 +DI2 level 183 +)))|(% colspan="2" %)DI2TODO2|(% colspan="2" %)DI2TORO2|(% colspan="2" %) 184 +| | | | | | | | | | 185 + 186 +The first byte: 00 is the broadcast address, 01-08 is the RX group number 187 + 188 +The second byte: send mapping request when not 0, not request when it is 0 189 + 190 +The third byte: ACK returned to the sender after the mapping is completed 191 + 192 +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 193 + 194 +The Fifth byte: DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered 195 + 196 +The Sixth byte: 0 does not trigger interrupt when DI1TORO1 interrupt is triggered 197 + 198 +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 199 + 200 +The 8th byte: DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered 201 + 202 +The 9th byte: DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered 203 + 15 15
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