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InDTU332 Industrial Cellular Modem
Reliable data transmission over 4G/3G/2G networks

With a high-reliability communication module, robust PPP, TCP/IP and application layer protocol suite and optimized network specs, especially narrow band link specs, the InDTU series sports outstanding performance on wireless communications.

Overview Applications Specifications Documentation Part Numbers
Compatible with 4G/3G/2G Networks

The InDTU builds TCP/IP based wireless transmission channels over 2G/3G/4G networks to carry out data communication between serial devices at remote stations and central controlling systems, to enable remote control of field devices.

Rugged Industrial Modem

Industrial-grade InDTU332 can withstand harsh conditions like extreme temperatures, dusty conditions, voltage fluctuations, etc. There are more than 500,000 units of InDTU332 are running reliably in distribution automation and industrial fields.                  

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

Highly-reliable Wireless Communications

With a high-reliability communication module, robust PPP, TCP/IP and application layer protocol suite, and optimized network specs especially narrow band link specs, the InDTU332 delivers outstanding performance on wireless communications. 

Built-in watchdog, self-recover from hardware faults 

Link redundancy mechanism to maintain continuous data transmission 

PPP layer heartbeat detection to maintain network connection 

● TCP layer heartbeat detection to maintain the connection to application server

Easy and Flexible to Manage

Local configuration and upgrade through serial port 

Local configuration with handheld device 

Support SMS configuration 

Support configuration through remote TCP/IP access 

Support InHand Device Manager platform for central remote management

Functions for Intelligent Solutions

Support protocol conversion between Modbus RTU and Modbus TCP 

Support protocol conversion between IEC 101 and IEC 104 

Support transmission optimization (DC protocol) 

Support multiple (1~5) centers

InDTU332 Specifications    
Items InDTU332L InDTU332W InDTU332G

TDD LTE: Band 38/39/40/41

FDD LTE: Band 1/3/8

HSPA+/HSPA/UMTS: Band 1/5/8/9

TD-SCDMA: Band 34/39

GPRS/EDGE: 900/1800 MHz    

GPRS/EDGE: 900/1800 MHz

WCDMA/HSPA: 900/2100MHz

GPRS 900/1800 MHz(China)

GPRS 850/900/1800/1900 MHz(Global)

Protocols IP/ICMP/PPP                    
InHand DC TCP/DC UDP                    
TCP/UDP, user define TCP/UDP login, Heartbeat packets                    
TCP server to establish a TCP connection with the InDTU                    
Domain Name Service                    
1~5 servers                    
Protocol Conversion Modbus RTU/TCP 
IEC 101 to SMS (optional)                    
IEC 101 to 104 conversion (optional)                    
Management Security 

Multi-Level authentication: admin, maintenance

Login authentication

Upgrade Patented secure upgrade process                    
Link Detection PPP,ICMP,TCP Keepalives, automatic recover from failure                    
Watchdog Self-diagnostics, automatic recovery from failure                    

Network Mgmt.

Automatic Dial up  Automatic dial up when powered on  
On-demand Dial up   Long  connection, short connection, activate by data, SMS,  phone; scheduled online/offline  
Configuration Support RS-232 serial port configuration, RTools, InHand Device Manager Cloud, SMS text  messages  
Upgrade Upgrad via serial port or remotely
Log Local syslog, remote logs, export logs via serial port
Centralized Management InHand Device Manager cloud-based centralized device management platform
Config. Backup Configuration file import and export     
SIM   USIM/SIM card: 3V/1.8V, flip card holder

WCDMA USIM/SIM card: 3V/1.8V, flip card holder

GPRS card: 3V, flip card holder

Industrial Serial

2*Serial Ports: 1*RS232/RS485 and 1*RS232
8-pin, 3.81mm industrial terminal
Baud Rate: 1200~115200bps
Data  Format: 8 bit, 1 stop, none parity, no flow control

Antenna 50Ω, SMA Female                    
Power Consumption
Power Supply +9~35V DC +9~35V DC +5~35V DC
Standby 90mA@12V   70mA@12V 8~14mA@12V
Working 93mA@12V   73mA@12V 35~55mA@12V  
Power on 156mA@12V     < 100mA@12V < 100mA@12V
Peak 156mA@12V < 100mA@12V < 100mA@12V
Operating temp -40℃~70℃  
Storage temp -40℃~85℃
Humidity 5 to 95% (noncondensing)  
Housing ABS engineered plastic shell
Dimensions (mm) 110x85x35mm    
Installation Hanger mounting  
ESD Electrostatic Discharge Immunity IEC61000-4-2, Level 3  
Surge Immunity IEC61000-4-5, Level 3  
Oscillatory Wave Immunity IEC61000-4-12, Level 3  
Part Numbers    
Model InDTU332
Part Number                    

InDTU332< N >-< S >                        

N (Cellular Type) GS52 (China)                     GPRS/GSM: 900/1800MHz                     2.5G                    

GS55 (Global)                        

GPRS/GSM: 850/900/1800/1900MHz

WS05 (China)                    

UMTS/HSPA: 900/2100MHz
EDGE/GPRS/GSM: 900/1800MHz


WS15 (North America)                        

UMTS/HSPA: 850/1900MHz
EDGE/GPRS/GSM: 850/1900MHz

WS25 (Europe)                        

UMTS/HSPA: 900/2100MHz
EDGE/GPRS/GSM: 900/1800MHz

LH09 (China)                        

FDD LTE: Band 1/3/8
TDD LTE: Band 38/39/40/41
TD-SCDMA: Band 34/39
UMTS/HSPA+: Band 1/5/8/9
EDGE/GPRS/GSM: 900/1800MHz


S (Serial Type)                        

232: RS232
485: RS485                        


InDTU332WS15-232: for North America, support 3G, RS232 serial port                        

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