GSM/GPRS/3G/4G/NB-IoTSensor To Cloud IoT SeriesPage 7 of 37 King Pigeon Hi-Tech. Co., Ltd Ver 1.15. Technical parametersItem Parameter rangeWorking voltage Standard power supply 12V DC, support 7~24V DCPower consumption< 230uA in low power mode; 10mA~30mA in normal mode; Maximum230-360mA (when making a phone call, it is related to the strength of thesignal; and the weaker the signal, the bigger the consumption)Means of communication Optional < GSM , GPRS, 3G, 4G, NB-IoT >Communication protocol Modbus RTU over TCP protocol, MQTT protocol, Data transparent transferSIM card Nano SIM cardExternal antenna SMA Antenna interface, 50 OhmUSB Micro USB interfaceDO - digital output OC type - open collector output, maximum load 1.5A/25V DCDIN - digital input Dry and wet contact compatible; wet contact 0~1V is close, 2~30V is openAIN - analog input 4~20mA or 0~5VAM2301 temperature andhumidity inputAM23001: temperature measuring range -40 to 80°C, precision ± 0.5°C,humidity measuring range 0~99.9%RH, precision ±3%RHDS18B20 temperatureinputDS18B20: temperature measurement range -55 to 125°C, precision ±0.5°CRS485 serialcommunicationA single package transmitted through the RS485 serial port is up to 250bytes.Cache capacity 32M-bit / 4M-Byte(4,194,304 Bytes)Working temperaturerange-10 to 60°CWorking humidity range Maximum relative humidity 95% (condensation free)Metal shell Size 54mm * 48mm * 19mmWater Proof Shell Size 65mm * 45mm * 21mmPCB Size 50.3mm * 36.8mm * 1.6mmPCBA pin definitionWhen used as a PCBA module, there are 7 pins, starting from the JP1 mark:Positive input pin, negative input pin, 1, 2, 3, signal indicator light pin, I/Oindicator light pin(For the definition of 1, 2, and 3 pins, please refer to 6.2 WiringInstructions)