GSM temperature logger supports DS18B20 temperature sensor

System Feature

• Cortex M3 32-bit ARM
• Reliable performance with built-in double watchdog, 24×7 operation
• Dual digital filters for anti-noise
• Network-reconnect and retransmission to ensure data accurately transmit
• Synchronize clock with multiple way, Sms, NTP, CwtIO Server
• Configurable action schedule(second, minute, day, week, month)
• Can automatically execute tasks according to preset Events
• Provide configure software, visual programming, over 100 parameters can be set
• Optional inside battery that life is 8-20 hours, cellular module Intelligent sleep when power lost

DI feature

• Monitor dry contact(NO or NC)

DO(T) feature

• Open-collector output(drive voltage=power supply voltage, Drive current≤500mA)
• DO can be activated by remote or local schedule
• Remember status when power lost

DO(K) feature

• Relay output(NO, contact load: 2A / 125VAC,220VDC)
• on/off/pulse DO by remote control or local event
• Remain down status when power lost

AI feature

• Accept 4-20mA (option: 0-5V), Sampling frequency: 33Hz, 10-bit precision)
• Convert signal to actual measure value,support adjustment
• Support offset and gain, alarm parameters, upload data setting
• Sensor disconnect alarm

SMS feature

• Preset 10 phone numbers (support distribute authority to receive sms)
• Sms alarm when any IO channel triggered or out of preset normal range
• Editable alarm and recover sms with time stamp
• Remote get device status or value by sending sms command
• On/off/pulse output by sending sms
• Can set interval to report IO channel's status or value by sms
• Remote update parameters by sms
• Sms remind for sim card overdue
• Power lost and recover alarm by sending sms

Wireless network communication

• Option network: cellular(2g/3g/4g) or Wi-Fi
• TCP/IP connect at most 4 servers(support Static IP address or domain)
• Support post or respond mode for data communication
• Communication protocol: Modbus TCP,http post, Cwt_IO(two-way communication)
• Can forward data between wireless network with RS485 or RS232

Modbus feature

• polling salve over RS485 with modbus rtu protocol
• Can be a I O module to be read/write by modbus master
• Support Modbus RTU to TCP convert over Ethernet or GPRS/3G

TI feature

• Can set high or lower level to alarm, data log via wireless network
• Fahrenheit or centigrade units for temperature
• Alarm when probe connection lost