InHand Networks' InDTU332 Industrial Serial to Cellular Modem, CAT M1 and NB-IoT

InHand Networks InDTU332 Industrial Serial to Cellular Modem
Model: InDTU332N
Availability: IN STOCK
5 or more $126.50, 10 or more $123.99

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InHand Networks' InDTU332 RS-232/RS-485 to Cellular Modem for CAT M1 and NB-IoT Networks

In industrial work, it’s not uncommon to utilize serial connections that need to communicate across standard and non-standard networks. If the location includes any level of remoteness, an industrial cellular modem might be the best bet. InHand Network’s InDTU332N will take a challenging communications problem and make it easy.

This modem is intended to bridge gaps. It has two serial inputs that transmit over GPRS or eMTC (enhanced machine-type communication) and NB-IoT (narrowband Internet of Things) bandwidths. It’s excellent for Internet of Things (IoT), machine-to-machine (M2M), and remote monitoring applications. Minimal operating and standby power consumption allows it to work tirelessly in the field for long durations. The supported management tools — which include a handheld configuration tool, Device Manager, and configuration utilities — make service and maintenance easy. The InDTU332 offers very reliable communications by utilizing fault recovery, link redundancy, and link detection functions.  Most of all, it’s been vetted by some of the biggest names in the business: Siemens, Schneider Electric, and China State Grid.

When you see the pure ruggedness of this modem’s design, you’ll know why it’s so trusted. It’s designed to connect directly to industrial protocols like Modbus RTU / TCP, IEC101 / IEC104, and TCP / UDP. While working with grid automation, it can endure extreme temperatures that rival the most challenging weather ever recorded on Earth. It’s highly resistant to electric surges and discharges.  With over 800,000 units deployed globally, it's a proven choice.

Key Features

  • Serial to LTE cellular modem supporting GPRS or eMTC / NB-IoT (LTE CCA M1 / NB1) networks
  • 2 serial ports – select dual RS-232 or RS-232 and RS-485 ports
  • APN and VPDN network access and CHAP / PAP authentication
  • Ping, DNS, transparent TCP/UDP, InHand DC TCP/DC UDP, Modbus RTU / TCP, and IEC101 / IEC104  protocols
  • Embedded watchdog timer, heartbeat, and auto-connect link detection improves reliability
  • Low power consumption: 0.15W Standby, 0.54W operating
  • Wide-range power input from 5V to 35V
  • Terminal block connection with reverse polarity and overload protection
  • Fanless, ABS enclosure with wall mount brackets
  • Broad operating temperature from -40° to 70°C and EMC level 3 protection
  • InHand RTool, Device Manager, and InDTU Tool cloud utilities


InDTU332NB02-232-DS,  2 RS-232 serial ports
InDTU332NB02-485-DS,  1 RS-232 and 1 RS-485 serial ports 

The InDTU332 expands your communication capacity by leaps and bounds. If you want tools that can do just as much for every facet of your network, you need access to the best available. Westward Sales specializes in providing these tools.  Our experts are keenly trained to help you save time by pointing you to the right equipment from the start. It is the perfect combination of performance and cost that makes for great networking, and that’s what we can provide when you call us today.

TypeLTE Gateway
Cellular Interface
CarrierAT&T, T-Mobile, and Verizon
SIM Holder1 card, 1.8 / 3 V
NetworksLTE CAT M1 / NB1, GPRS or eMTC / NB-IoT
AntennaSMA, 50 Ω
Serial Interface
Serial Ports2 RS-232 | 1 RS-232, 1 RS-485
SignalsRS-232: TX, RX, ground; RS-485: +, -, ground
Network Management
AuthenticationCHAP / PAP
IP SuitePing, DNS, transparent TCP/UDP, InHand DC TCP/DC, UDP, user-defined login / heartbeat data packet
IP SecurityMulti-level user authorization, security certification
Network AccessAPN, VPDN
System ConfigurationLocal serial port, RTool, InHand Device Manager, SMS, import and export of configuration files, remote or local firmware upgrades
ProtocolsModbus RTU/TCP protocol conversion
ReliabilityLink connection detection via heartbeat and auto-connect, embedded watchdog timer,
MaintenanceSystem logs, dial-on-demand for data and SMS activation, InHand Device Manager for remote monitoring
Power ConsumptionAt 12 VDC: 15 mA standby, 30 mA working, 160 mA peak
ConnectionTerminal block
Input Voltage5 to 35 VDC
Reverse Polarity ProtectionYes
Overload ProtectionYes
EnclosureFanless, ABS plastic
MountingWall mount flanges included
Operating Temperature-40° to 70°C
Storage Temperature-40° to 85°C
Humidity5 to 95% non-condensing
CertificationsCE, FCC, PTCRB, IC
EMCEN 61000-4-2, 61000-4-5, 61000-4-12, Level 3