Industrial 4G Modem with RS-232 and USB interface (Asia Only)


Industrial 4G Modem with RS-232 and USB interface (Asia Only)


  1. Industrial design, making it a reliable cellular solution for data collection and transmission.
  2. Reliable GSM/GPRS/EDGE/WCDMA/HSPA/LTE network connectivity, providing fast and cost-effective long-range wireless applications.
  3. Designed for Data, SMS and Voice Applications.
  4. Support TCP Server, TCP Client, UDP Client Connection stack.
  5. Support Standard AT Commands.
  6. A Digital Input Channel for Resetting the System.
  7. LED Indicators for 2G/3G/4G and Power Indication.
  8. High Reliability in Harsh Environment.
  9. RS-232 Port Supports 9600 bps to 115200 bps.
  10. USB 2.0 high speed.
  11. Mount Easily on DIN-Rail.


The GTM-204M Series is an industrial 4G LTE and Quad-band GSM modem with RS-232 and USB interfaces that work at frequencies of 4G LTE and 3G WCDMA and 2G GSM. The modems utilize the 4G/3G/2G networks to transfer data. The features of the GTM-204M Series allow a variety of PLC and PC applications to take advantage of SMS and 4G/3G/2G connectivity.


  • Remote Data Monitor and Control.
  • Water, gas and oil flow metering and schedule.
  • Power station monitoring and control.
  • Oil field, weather forecast, environmental protection, street lamp monitoring and control.
  • Fleet management.
  • Vending machine.
  • Vehicle logistics and diagnostics controlling.


  • ANT-421-05
LED Indicators
Status 1 x Power
1 x 4G
2G System
Data Transmission Rate GPRS
Downlink transfer: Max. 85.6 kbps
Uplink transfer: Max. 42.8kbps
Frequency Band 900/1800MHz
Coding Schemes CS 1, CS 2, CS 3, CS 4
GPRS Multi-slot GPRS class 12; GPRS station class B
Power Class Class 4 (2 W @ 850/900 MHz)
Class 1 (1 W @ 1800/1900 MHz)
SMS Format Sending: UCS2/7bits
Receiving: UCS2/7bits
3G System
Data Transmission Rate DC-HSPA+
Downlink transfer: Max. 42 Mbps; Uplink transfer: Max. 5.76Mbps
TD-SCDMA Download: Max. 4.2 Mbps; Upload: Max 2.2Mbps
CDMA2000 EVDO Download: Max. 14.7 Mbps; Upload: Max 5.4Mbps
Frequency Band WCDMA 900/2100 MHz
TD-SCDMA 1900/2100
CDMA2000 (BC0) 800
Power Class Class 3 (250mW @ WCDMA/HSPA)
SMS Mode MT, MO, CB, Text and PDU mode
4G System
Data Transmission Rate LTE
Downlink transfer: Max. 100 Mbps
Uplink transfer: Max. 50Mbps
Frequency Band FDD LTE: B1/B3/B8
TDD LTE: B38/B39/B40/B41
Reset Input
Type Isolated, 3750 Vrms
ON Voltage Level +3.5 VDC ~ +30 VDC
OFF Voltage Level +1 VDC max.T43
Input Impedance 3 kΩ, 0.25W
COM Ports
Ports 1 x RS-232 (RxD, TxD, GND)
Baud Rate 9600 bps ~ 115200 bps (default:115200 bps)
Specification USB 2.0 (high speed)
Driver Windows XP/7/8/10, Windows Server 2012
Casing Metal
Dimensions (mm) 28 x 78.5 x 100 (W x L x H)
Installation DIN-Rail
Operating Temperature -25℃ to 70℃
Storage Temperature -40℃ to 80℃
Humidity 5~90% RH, non-condensing
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