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Industrial Quad-band GPRS/GSM Cellular Modem with USB Interface. Supports operating temperature from -25°C ~ +55°C. GTM-201-USB is phased out and replaced by GTM-204M-4GE and GTM-204M-4GC.


Industrial Quad-band GPRS/GSM Cellular Modem with USB Interface. Supports operating temperature from -25°C ~ +55°C. GTM-201-USB is phased out and replaced by GTM-204M-4GE and GTM-204M-4GC.

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The GTM-201-USB has officially been phased out and will no longer be available. It has now been replaced by GTM-204M-4GE and GTM-204M-4GC.

Application Image GTM-201-USB

The GTM-201 series are industrial Quad-band GSM/GPRS modems with RS-232 and USB interfaces that work on frequencies of GSM 850 MHz, EGSM 900 MHz, DCS 1800 MHz and PCS 1900 MHz. The modems utilize the GSM/GPRS network for convenient and inexpensive data transfer from remote instruments, meters, computers or control systems in either live or packet data. GTM-201 series have the integrated TCP/IP stack so that even simple controllers with serial communications ports can be connected to the modem without the need for special driver implementation. With GTM-201, systems can be SMS and GPRS connection applications with various PLC and PC's. With the voice interface, these modems can also be applied to alarm systems with sounds.

  • Supply Voltage: +10 VDC ~ +30 VDC
  • 4 KV ESD Protection
  • Quad-band GSM/GPRS Modem Operating on 850/900/1800/1900 MHz
  • Designed for GPRS, Data, Fax, SMS and Voice Applications
  • Support TCP Server, TCP Client, UDP Client Connection from GPRS
  • Support Standard AT Commands
  • A Digital Input Channel for Resetting the System
  • Provide the MIC Input and Speaker (32 Ω) Output Interface
  • LED Indicators for GSM and Power Indication
  • High Reliability in Harsh Environment
  • USB Driver for Windows, WinPAC (WinCE5.0), LinPAC (Linux 2.6) (GTM-201-USB)
  • Mount Easily on DIN-Rail
  • Applications: Industrial Quad Band GPRS / GSM Modem
    • Application 1:

    • Application 2:


Domestic Overage Fees
Models GTM-201-RS232 GTM-201-USB
GPRS/GSM Quad-band 850/900/1800/1900 MHz
GPRS Multi-slot Class 10/8
GPRS Mobile Station Class B
GPRS Class 10 Max. download speed 85.6 kbps
CSD Up to 14.4 kbps
Compliant to GSM Phase 2/2+ Class 4 (2 W @ 850/900 MHz); Class 1 (1 W @ 1800/1900 MHz)
Coding Schemes CS 1, CS 2, CS 3, CS 4
SMS Text and PDU Mode
Serial Ports
Serial Standards RS-232 (DB9 Female) USB (B-TYPE)
Baud Rate 9600 bps ~ 115200 bps -
USB Interface - Yes
Include Cable (CA-USB18) x 1 - USB type A connector (Type A to Type B cable provided)
Compatibility - USB 1.1 and 2.0 standard
USB Driver Support - Windows 98 and 2000; Windows XP and XP 64-bit; Windows Vista and Vista 64-bit; Windows XP Embedded; WinPAC (WinCE5.0); LinPAC (Linux kernel 2.6)
Reset Input
Input Type Isolated, 3750 Vrms
On Voltage Level +3.5 VDC ~ +30 VDC
Off Voltage Level +1V max.
Input Impedance 3 kΩ, 0.25 W
LED Indicators
Power Red color
GSM/GPRS Green color
Protection Power reverse polarity protection
Frame Ground Protection ESD, Surge, EFT, Hi-Pot
Required Supply Voltage +10 VDC ~ +30 VDC
Power Consumption Idle: 25 mA @ 24 VDC; Data Link: 100 ~ 400 mA (peak) @ 24 VDC
Connection 5-Pin 3.81 mm Removable Terminal Block
Casing Plastic
Flammability UL 94V-0 materials
Dimensions (W x L x H) 33 mm x 87 mm x 107 mm
Installation DIN-Rail
Operating Temperature -25 °C ~ +55 °C
Storage Temperature -40 °C ~ +80 °C
Ambient Relative Humidity 5 ~ 95% RH, non-condensing


Please contact your local cellular provider for data connect plans. We have tested and confirmed GTM-201-RS232 works with this AT&T data plan:

Data Connect Plan Information
Data Monthly Cost Wi-Fi Access Domestic Overage Fees Canadian Data International Data Additional Details
DataConnect 5 GB $60.00 x $0.05 per MB $0.015/KB $0.0195/KB View Details

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