InDTU332 Industrial Serial to Cellular Modem LTE CAT M1/NB1

InHand Networks SKU: InDTU332NB02-232-DS


Industrial Serial to Cellular Modem

InHand InDTU332 reliable and industrial serial to cellular modems are designed to provide connectivity across a broad range of M2M and IoT applications. Featuring LTE CAT M1/NB1, they allow Internet connectivity via serial port to PLCs, Meters, Vending Machines. They help to transport data from any industrial device to data control servers, allowing businesses to benefit from real-time data monitoring, management and control.

Industrial Cellular LTE CAT M1/NB1 Modem

Operation Band

Network type Model(region) Band
CAT-M1/NB1 InDTU332NB02 eMTC/NB-IoT (LTE Cat M1/NB1)
Band 1,2,3,4,5,8,12,13,17,18,19,20, 25,26,28 (band 39 in M1-only)

Product Highlights

Ultra Small Form Factor Cellular Modem

Benefit from a super compact and reliable serial to cellular modem. Perfect for all industrial IoT & M2M applications such as PLCs, meters, vending machines and more.

Compact-sized, easy to fit and integrate

Fully Industrial Design

EMC level 2, fan-less cooling, solid metal shell, strong resistance to vibration and shock, effectively reduce the fault rate.

Industrial Design for harsh environment

Low Power Consumption

Fully operational for any M2M/IoT application where the power is often scarce.

Low Power Consumption

Available in NB-IoT and LTE-M1

NB-IoT and LTE-M1

Highly-Reliable Wireless Communications

Multi-layer link detection mechanisms including PPP layer heartbeat, ICMP detection, TCP Keepalive and application layer heartbeat, keeping wireless connection "always-on"

Highly-Reliable Wireless Communications

Smart Protocol Conversion

Modbus RTU/Modbus TCP protocol conversion for industrial SCADA systems and field devices

Modbus RTU, Modbus TCP

Intelligent Protocol Processing

Supporting user-defined register & heartbeat packets, transparent TCP/UDP protocol, InHand DC protocol,multi-center, 1-5 centers.

Network Hearbeat Packet

InHand Remote Centralized Management

InDTU332 is also compatible with InHand Remote Management System. This platform allows to remotely manage & monitor the status and parameters of all routers & gateways by InHand Networks

Device Manager - Join for free
  • • Remotely manage your distributed InHand routers & gateways
  • • Upgrade firmware and update configuration in batch effectively
  • • Support grouping management and access control
  • • Monitor device status and data usage in real time
  • • Easily track your devices in a map view
Device Manager - remote management

Product Detail

Cellular LTE CAT M1/NB1 Modem with Serial Ports

Packaging List

Cellular LTE CAT M1/NB1 Modem, terminal block, 4G antenna




CE, CF certification



CE, CF, IC, AT&T, Verizon, PTCRB certifications

InDTU332 Hardware Specifications
Industrial Serial Port 2 x Logic serial ports:
Serial port 1: RS-232/RS-485 (Optional)
Serial port 2: RS-232
RS-232 signal: TXD, RXD, GND
RS-485 signal: 485+, 485-, GND
8PIN industrial terminal, 3.81mm pitch
SIM Card Slot 1,8V/3V, card slot
Antenna 50Ω / SMA x 1
Mechanical Specs
Installation Wall-mounting
Protection Rating IP30
Housing ABS engineering plastics
Cooling Fanless
Power Supply
Power Input DC5-35V
Polarity Reverse Protection Supported
Power Interface Pluggable industrial terminal connection
Overload Protection Supported
Consumption(@12V) InDTU332G: 10mA (Standby), 40mA (Working), 45mA (Peak)
InDTU332N: 15mA (Standby), 30mA (Working), 160mA (Peak)
Ambient Temperature and Humidity
Operating Temperature -40 ~ +70℃
Ambient Humidity 5 ~ 95% (noncondensing)
Storage Temperature  -40 ~ +85℃
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
InDTU332 Software Specifications
Network Connection
Network Access APN, VPDN
Access 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 Supports login security certification
Reliable Upgrade Patent upgrade mechanism, ensures reliable upgrade
Link Connection Detection Sends heartbeat packet detection, automatically 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 Supports import and export of configuration files
Upgrade Method Patent upgrade mechanism, upgrade firmware through the local serial port or remotely
Log Supports local and online 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 Supports InHand Device Manager remote central management



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