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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... ... @@ -4,13 +4,9 @@ 4 4 5 5 = **1. 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 ... ... @@ -17,15 +17,13 @@ 17 17 = **2. Features for this firmware** = 18 18 19 19 20 -== **2.1 Point To Point** ==16 +== **2.1 Overview** == 21 21 18 +[[image:image-20220602111219-1.png]] 22 22 23 -[[image:image-20220602111219-1.png||height="472" width="972"]] 24 24 21 +== **2.2. Configure** == 25 25 26 -(% class="wikigeneratedid" id="H2.2.Configure" %) 27 -(% style="color:blue" %)**Configure:** 28 - 29 29 (% border="1" style="background-color:#f7faff; color:black; width:500px" %) 30 30 |=**A's configuration**|=**B's configuration** 31 31 |AT+GROUPMOD=0|AT+GROUPMOD=0 ... ... @@ -38,179 +38,52 @@ 38 38 |AT+DI2TODO2=2 |AT+DI2TODO2=2 39 39 |AT+DI2TORO2=2|AT+DI2TORO2=2 40 40 35 +(% style="color:#037691" %)**A's configuration: ** **B's configuration:** 41 41 42 -== **2.2 Point To Mult-Point ** == 37 +((( 38 +AT+GROUPMOD=0 AT+GROUPMOD=0 39 +))) 43 43 41 +((( 42 +AT+TXCHS=868700000 AT+TXCHS=869000000 43 +))) 44 44 45 -[[image:image-20220602111219-2.png]] 45 +((( 46 +AT+RXCHS=869000000 AT+RXCHS=868700000 47 +))) 46 46 47 - 48 -[[image:image-20220602111219-3.png]] 49 - 50 50 ((( 51 -I fthesenderdoesnotgettheACKreplyfromthereceiver,itwillretransmitupto4times,eachintervalis6seconds,andtheUplinkCounteroftheretransmissionwillnotincrease.50 +AT+TRIG1=2,50 AT+TRIG1=2,50 52 52 ))) 53 53 54 - 55 -== **2.3 AT command** == 56 - 57 - 58 -(% style="color:#037691" %)**ATZ** (%%)**: ** Trig a reset of the MCU 59 - 60 -(% style="color:#037691" %)**AT+FDR** (%%)**:** Reset Parameters to Factory Default, Keys Reserve 61 - 62 -(% style="color:#037691" %)**AT+FCU** (%%)**:** Get or Set the Frame Counter Uplink 63 - 64 -(% style="color:#037691" %)**AT+FCD** (%%)**:** Get or Set the Frame Counter Downlink 65 - 66 -(% style="color:#037691" %)**AT+TXP** (%%)**:** Get or Set the transmit power, the maximum is 20dBm (default is 14dBm) 67 - 68 -(% style="color:#037691" %)**AT+SYNC** (%%)**:** Get or Set the Sync word [1:0x34,0:0x12] (default is 1) 69 - 70 -(% style="color:#037691" %)**AT+PMB** (%%)**: **Get or Set the preamble (default:8) 71 - 72 -(% style="color:#037691" %)**AT+TXCHS **(%%)**:** Get or Set the transmit frequency of TX (default:868700000) 73 - 74 -(% style="color:#037691" %)**AT+TXSF **(%%)**:** Get or Set the spreading factor of TX (7 to 12) (default:12) 75 - 76 -(% style="color:#037691" %)**AT+RXCHS **(%%)**:** Get or Set the transmit frequency of RX (default:869000000) 77 - 78 -(% style="color:#037691" %)**AT+RXSF **(%%)**:** Get or Set the spreading factor of RX (7 to 12) (default:12) 79 - 80 -(% style="color:#037691" %)**AT+BW **(%%)**: **Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0) 81 - 82 -(% 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) 83 - 84 -(% style="color:#037691" %)**AT+TDC **(%%)**:** Get or set the application data transmission interval in ms(default 10 minutes) 85 - 86 -(% style="color:#037691" %)**AT+VER **(%%)**:** Get firmware version number 87 - 88 -(% style="color:#037691" %)**AT+SEND **(%%)**: **Set Custom sent hex data 89 - 90 -(% style="color:#037691" %)**AT+GROUPMOD **(%%)**: **Set or Get the grouping mode of the device (default: 0) 91 - 92 92 ((( 93 - (% style="color:#037691" %)**AT+GROUPID **(%%)**:**SetorGetthepasswordformatchingbetweenTXgroupandRXgroup,whichcanbecomposedofnumbersorcharacters(default:12345678)54 +AT+TRIG2=2,50 AT+TRIG2=2,50 94 94 ))) 95 95 96 -(% style="color:#037691" %)**AT+TRIG1 **(%%)**:** Set or Get the DI1 pin interrupt trigger mode (default 0,0) 97 - 98 -(% style="color:#037691" %)**AT+TRIG2 **(%%)**: **Set or Get the DI2 pin interrupt trigger mode (default 0,0) 99 - 100 -(% style="color:#037691" %)**AT+DI1TODO1 **(%%)**: **Set or get the mode in which DI1 maps to DO1 (default 0) 101 - 102 -(% style="color:#037691" %)**AT+DI1TORO1 **(%%)**: **Set or get the mode in which DI1 maps to RO1(default 0) 103 - 104 -(% style="color:#037691" %)**AT+DI2TODO2 **(%%)**:** Set or get the mode in which DI2 maps to DO2(default 0) 105 - 106 -(% style="color:#037691" %)**AT+DI2TORO2 **(%%)**: **Set or get the mode in which DI2 maps to RO2(default 0) 107 - 108 - 109 - 110 -(% style="color:#4f81bd" %)**Example 1:** 111 - 112 -**AT+SEND=01020304 **will send a payload of 01020304 113 - 114 - 115 -(% style="color:#4f81bd" %)**Example 2: ** 116 - 117 -**AT+TRIGx=a **Trigger directly without triggering time 118 - 119 -**AT+TRIGx=a,b** 120 - 121 -a=0: falling edge; 122 - 123 -a=1: rising edge; 124 - 125 -a=2: falling edge or rising edge; 126 - 127 -b: triggering time in milliseconds. 128 - 129 -AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms. 130 - 131 - 132 -(% style="color:#4f81bd" %)**Example 3: ** 133 - 134 -**AT+DI1TODO1= maps value** 135 - 136 -**AT+DI1TORO1= maps value** 137 - 138 -**AT+DI2TODO2= maps value** 139 - 140 -**AT+DI2TORO2= maps value** 141 - 142 - 143 -(% border="1" style="background-color:#f7faff; color:black; width:706px" %) 144 -|=(% style="width: 102px;" %)Maps value|=(% style="width: 331px;" %)DIx to DOx|=(% style="width: 268px;" %)DIx to ROx 145 -|(% style="width:102px" %)0|(% style="width:331px" %)No Action|(% style="width:268px" %)No Action 146 -|(% 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" %)((( 147 -If DIx is high, control ROx to close, 148 - 149 -if DIx is low, control ROx to open 57 +((( 58 +AT+DI1TODO1=2 AT+DI1TODO1=2 150 150 ))) 151 -|(% 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" %)((( 152 -If DIx is high, control ROx to open, 153 153 154 -if DIx is low, control ROx to close 61 +((( 62 +AT+DI1TORO1=2 AT+DI1TORO1=2 155 155 ))) 156 -|(% style="width:102px" %)3|(% style="width:331px" %)DOx state flip|(% style="width:268px" %)ROx state flip 157 157 158 -(% style="color:#4f81bd" %)**Example 4: ** 159 - 160 -**AT+GROUPMOD=0** Set to point to point mode 161 - 162 -**AT+GROUPMOD=0,aa** Set the TX group that controls the number of aa (The maximum value of aa is 8) 163 - 164 164 ((( 165 - **AT+GROUPMOD=1,bb**SettotheRXgroupcontrolledbytheTXgroup,numberedbb(Themaximumvalueofaais8)66 +AT+DI2TODO2=2 AT+DI2TODO2=2 166 166 ))) 167 167 168 -**AT+GROUPMOD=0,2** Set to control the TX group of the two RX groups 169 - 170 -**AT+GROUPMOD=1,1** Set the RX group numbered 1 171 - 172 -**AT+GROUPMOD=1,2** Set the RX group numbered 2 173 - 174 - 175 -== **2.4 Data Format** == 176 - 177 -8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum 178 - 179 - 180 -(% style="color:#4f81bd" %)**Payload:** 181 - 182 -(% border="1" style="background-color:#f7faff; color:black; width:938px" %) 183 -|=(% 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;" %)1 184 -|(% style="width:123px" %)**Value**|(% style="width:38px" %)address|(% style="width:70px" %)request|(% style="width:52px" %)ACK|(% style="width:127px" %)((( 185 -DI1& 186 - 187 -DI1 level 188 -)))|(% style="width:101px" %)DI1TODO1|(% style="width:91px" %)DI1TORO1|(% style="width:111px" %)((( 189 -DI2& 190 - 191 -DI2 level 192 -)))|(% style="width:105px" %)DI2TODO2|(% style="width:106px" %)DI2TORO2 193 - 194 -(% style="color:#037691" %)**The first byte**(%%)**:** 00 is the broadcast address, 01-08 is the RX group number. 195 - 196 -(% style="color:#037691" %)**The second byte**(%%)**:** send mapping request when not 0, not request when it is 0. 197 - 198 -(% style="color:#037691" %)**The third byte**(%%)**:** ACK returned to the sender after the mapping is completed. 199 - 200 200 ((( 201 - (% style="color:#037691"%)**Thefourthbyte**(%%)**:**thehighfourbitsare1torepresentDI1,andthelowfourbitsarethelevelofDI1whentheinterruptistriggered.70 +AT+DI2TORO2=2 AT+DI2TORO2=2 202 202 ))) 203 203 204 -(% style="color:#037691" %)**The Fifth byte**(%%)**: **DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered. 205 205 206 - (% style="color:#037691"%)**TheSixth byte**(%%)**:** 0 does not triggerinterrupt when DI1TORO1 interrupt istriggered.74 +== **2.3. Serial port display** == 207 207 208 -((( 209 -(% 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. 210 -))) 76 +[[image:image-20220602111219-2.png]] 211 211 212 -(% style="color:#037691" %)**The 8th byte**(%%)**: **DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered. 213 213 214 - (% style="color:#037691" %)**The 9th byte**(%%)**:** DI2TORO2 when an interrupt is triggered, 0 whenan interrupt is not triggered.79 +[[image:image-20220602111219-3.png]] 215 215 81 +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. 82 + 216 216