Siemens 6NH9720-3AA00
Siemens 6NH9720-3AA00
Siemens 6NH9720-3AA00
Siemens 6NH9720-3AA00
Siemens 6NH9720-3AA00
Siemens 6NH9720-3AA00
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6NH9720-3AA00

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The 6NH9720-3AA00 is a Siemens SIMATIC NET SINAUT MD720-3 GSM/GPRS modem with RS232 interface, quadband GSM support, and AT command interface for remote communication.
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Technical specifications for 6NH9720-3AA00

  • Manufacturer:
    Siemens
  • Part Number:
    6NH9720-3AA00
  • Product Family:
    Siemens Simatic Net
  • Product Type:
    GPRS Modem
  • Transmission Rate (GSM):
    9600 bit/s
  • Power Supply:
    12-30V DC (nominal 24V)
  • Power Loss (typical):
    5 W
  • Operating Temperature:
    -20 to +60°C
  • Storage Temperature:
    -25 to +85°C
  • Relative Humidity (max):
    95% at 25°C
  • Protection Class:
    IP40
  • Hazardous Area Approval:
    II 3 G Ex nA IIC T4 Gc
  • Weight:
    0.15 kg
  • Estimated shipping dimensions:
    2.2x13.2x10cm
  • Tariff Code:
    8517799000
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Application Firmware and Updates Configuration

Features:

  • Supports CSD, GPRS, and SMS over quadband GSM; enables remote monitoring and control of distributed automation sites without wired networks.
  • Connects to PLCs, RTUs, and other automation devices via standard RS232; configurable using widely supported AT command set.
  • Approved for Zone 2 explosive atmospheres (II 3 G Ex nA IIC T4 Gc); suitable for oil/gas, chemical, and other hazardous industrial environments.
The 6NH9720-3AA00 (SINAUT MD720-3) is a cellular modem that uses quadband GSM networks (850/900/1800/1900 MHz) to provide communication for remote automation sites. Where wired connections (Ethernet, fiber, leased line) are too expensive or physically impossible, this modem uses existing mobile phone networks. It supports Circuit Switched Data (CSD) for dial-up connections, GPRS for packet-oriented data transmission, and SMS for short message alerts. The transmission rate is 9600 bit/s for GSM. Typical applications include water/wastewater pumping stations, pipeline monitoring, tank farms, and environmental monitoring stations.

The 6NH9720-3AA00 connects to automation devices via a standard RS232 interface (SUB-D connector). It includes a gender changer for RS232/PPI adapter, allowing connection to Siemens SIMATIC S7-200 PLCs (PPI protocol) and other devices with 9-pin serial ports. The modem is configured and controlled using AT commands – a standardized command set originating from the Hayes modem era. Common AT commands include ATD for dialing, ATH for hang-up, AT+CGDCONT for defining GPRS contexts, and AT+SINAUT for SINAUT-specific functions.

The 6NH9720-3AA00 carries the certification II 3 G Ex nA IIC T4 Gc, allowing installation in Zone 2 hazardous areas where explosive gas atmospheres are likely to occur only infrequently and for short periods. The “Ex nA” designation indicates “non-sparking” apparatus – the modem is designed to avoid sparks or high temperatures that could ignite a surrounding explosive atmosphere. The “IIC” means it is suitable for gases in temperature classes IIA, IIB, and IIC (the most explosive, including hydrogen and acetylene). “T4” means the maximum surface temperature does not exceed 135°C. For plant operators in oil refineries, chemical plants, gas pipelines, and similar facilities, this approval is essential for regulatory compliance.

The 6NH9720-3AA00 Siemens GPRS Modem may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL)by the manufacturer (OEM).

Siemens 6NH9720-3AA00 GPRS Modem Manuals, Datasheets,Drivers,Link Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
Siemens 6NH9720-3AA00 GPRS Modem Specs

General

  • Manufacturer Siemens
  • Model 6NH9720-3AA00
  • Condition New Original ready stock
  • Product Family 6NH9720-3BA00,6NH9720-3CA00,6NH9720-3DA00
Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
  • Telecontrol: Works with SINAUT ST7 or SINAUT Micro SC systems to enable long-distance data exchange between PLCs (such as S7-200, S7-300) and the control center.
  • SMS Alarm and Control: Sends specific alarm messages to mobile phones or receives SMS commands to start/stop field equipment.
  • Teleservice: Technicians can remotely connect to the field controller via GPRS network to perform program diagnostics or upload/download code.
  • Distributed Data Acquisition: Used in geographically dispersed scenarios such as water treatment, power monitoring, and gas pipeline monitoring.
  • Firmware Package: The last major update package in history is V1.7.7.
  • Entering Service Mode: While the module is running, press and hold the SET button for 2 to 4 seconds until the LED "Q" lights up.
  • Uploading Files: Log in via an FTP client (default username/password is usually service / service), and upload the new .bin file and !cmdfile to the module.
  • Control Method: Control is performed using the standard AT command set.
  • Programming: Developers can write instruction blocks in the PLC program (such as the S7-200 module library) to dial or send SMS messages via serial port AT commands.
  • Purpose: Designed specifically for SINAUT Micro SC systems, the module automatically establishes a GPRS connection.
  • Configuration Tools: Typically used with SINAUT ST7 configuration software or a dedicated configuration tool disk for parameter settings (such as APN access point, central server IP, etc.).
Description
The 6NH9720-3AA00 is a SINAUT MD720-3 mobile radio modem from Siemens. It supports GSM services including CSD (Circuit Switched Data), GPRS, and SMS. The modem operates on quadband GSM frequencies and features an RS232 interface (SUB-D connector) for connection to automation devices. It includes a gender changer for RS232/PPI adapter. 

When using the 6NH9720-3AA00, engineers can establish automatic GPRS connections for remote monitoring and control of distributed automation systems. The modem supports AT commands for configuration and control. It operates on a 12-30V DC power supply (nominal 24V) with typical power loss of 5 W. 

The 6NH9720-3AA00 has a transmission rate of 9600 bit/s for GSM transmission. It is approved for use in hazardous areas with certification II 3 G Ex nA IIC T4 Gc. The modem meets EMC standards EN 55024, EN 55022 class A, and EN 61000-6-2. 

For legacy remote communication system expansions, the 6NH9720-3AA00 provides a reliable GSM/GPRS modem solution. It is part of Siemens SIMATIC NET industrial communication portfolio. The manual is supplied on CD in German and English. 
Alternative Names
6NH9720-3BA00 6NH9720-3CA00 6NH9720-3DA00 6NH972O-3AAOO
Technical notes
The 6NH9720-3AA00 has an AT command interface for configuration and control. This is a standard modem command set widely used in industrial telemetry. The modem supports automatic GPRS connection establishment, simplifying integration with SCADA systems.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How does 6NH9720-3AA00 enable remote communication?
The 6NH9720-3AA00 uses GSM/GPRS mobile networks to establish automatic data connections. It supports CSD, GPRS, and SMS services. With an RS232 interface, it connects to PLCs or RTUs, allowing remote monitoring and control via cellular networks without wires or fiber.
What power supply does 6NH9720-3AA00 require?
The 6NH9720-3AA00 accepts 12-30V DC (nominal 24V). Typical power loss is only 5 W. It measures 22.5 mm wide and weighs 150 g, allowing easy DIN rail mounting in crowded cabinets. An SMA antenna socket requires an external GSM antenna.
Is 6NH9720-3AA00 approved for hazardous areas?
Yes. The 6NH9720-3AA00 has certification II 3 G Ex nA IIC T4 Gc, allowing installation in Zone 2 hazardous areas (explosive gas atmospheres). Check national approvals for specific country requirements before installation.
How do I configure the 6NH9720-3AA00?
The 6NH9720-3AA00 is configured using AT commands via the RS232 interface. It supports automatic GPRS connection establishment. It does not support web-based management, Telnet, or HTTPS. The manual CD contains detailed commands in German and English.

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