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.).