InDTU332 Industrial Cellular Modem

Reliable Serial to Cellular Communication

The InDTU332 cellular modem provides wireless data communications between field serial devices and the central control system to enable remote control of industrial field sites.

Featuring rugged design, high reliability and easy-to-use features, the InDTU332 is ideal for M2M and IoT applications including distribution automation, smart metering, water & wastewater, heating, street light monitoring and etc. It is available with LTE CAT M1 and CAT NB1 globally.

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Industrial Design

● Industrial-grade chip of ultra-low power consumption, adaptable to various power supply modes

● Wide operating temperature: -40°C~70°C

● Wide voltage input: 5~35VDC

● Solid housing, IP30 protection

● Compact-sized, easy to fit and integrate

● CE, FCC certified

InDTU332 Specifications
Items InDTU332G
Network Connection
Internet Access APN, VPDN
Authentication CHAP/PAP
Network Type GPRS or eMTC/NB-IoT(LTE Cat M1/NB1)
Network Protocol
Network Protocol Ping, DNS, transparent TCP/UDP, InHand DC TCP/DC

UDP, user-defined login/heartbeat data packet

Protocol Conversion Modbus RTU/TCP protocol conversion
Network Security
Multi-level Authorization User levels: administrator, maintenance staff
Certification Security Support login security certification
Reliable Upgrade Patent upgrade mechanism, ensures reliable upgrade
Link Connection Detection Send heartbeat packet detection, auto connect once disconnected
Embedded Watchdog Device operation self-detection technology, and self-recovery from operation faults
Network Management
Configuration Method Local serial port, RTool, InHand Device Manager, SMS (InDTU332G only)
Configuration Backup Support import and export of configuration files
Upgrade Method Patent upgrade mechanism, upgrade firmware through local serial port or remotely
Log Support local and remote viewing of logs, facilitate engineers to check device operating status
Dial-on-Demand Data activation, timed on/off,  SMS activation, phone activation (InDTU332G only)
Network Management Support InHand Device Manager remote central management
Serial Port 2 x Logic serial ports:
Serial port 1: RS-232/485 (Optional)
Serial port 2: RS-232
RS-232 signal: TXD, RXD, GND
RS-485 signal: 485+, 485-, GND
8 PIN industrial terminal, 3.81mm pitch
SIM Card Slot 1.8V/3V, card slot
Antenna 50Ω / SMA x 1
Mechanical Properties
Installation Wall-mounting
Protection IP30
Cooling Fanless
Housing ABS engineering plastics
Power Supply
Power Input DC5-35V
Power Interface Pluggable industrial terminal connection
Polarity Reverse Protection Support
Overload Protection Support
Consumption (@12V) InDTU332G: 10mA (Standby), 40mA (Working), 45mA (Peak)

InDTU332N: 16mA (Standby), 30mA (Working), 160mA (Peak)

Operating Temp. -40 ~ 70℃
Storage Temp. -40 ~ 85℃
Ambient Humidity 5 ~ 95% (non-condensing)
LED Indicators
EMC Index
Static EN61000-4-2, level 3
Surge EN61000-4-5, level 3
Shock Wave Immunity EN61000-4-12, Level 3

InDTU332N: CE, FCC, PTCRB, IC, Verizon Wireless, AT&T