DGT TRAMCommunication modem

DGT TRAM is a family of industrial communication modems providing remote access to remote customer system units with use of data transmission services, offered by cellular networks or other radio technologies.
TRAM family products are used in those applications, where reliable access to data transmission networks is important. Electricity meters are the important application fields of TRAM modems, as they are integral part of the Intelligent Grid Networks.
The TRAM devices are available in many variants, and their equipment and functionality, thanks to the flexible hardware and software construction, are tailored to the customer’s requirements. For example, for various types of energy meters we have developed dedicated versions of modems: integrated with the meter’s main board and replaceable (mounted in a counter housing, in an separated case).

TRAM modems, implementing telemechanics functionality installed in other industrial devices are designed with strict accordance to the customer’s specification. They can have form of a separate device, e.g. industrial external modem, or they can be integrated into other equipment as the internal subsystem.

TRAM products implement telemechanics functionality:

  • telemetry - remote reading the data (e.g. from electricity meters),
  • remote control - remote supervision of control systems, etc.
  • remote access to other devices.

WWAN access
DGT TRAM devices enable building modern distributed industrial systems (e.g. Smart Grid) where is a need to add the functionality of wireless communication with central systems over the latest generation cellular systems as LTE and compatible with older UMTS and GSM systems and also in the CSD channel commutation mode in 2G systems.


Local communication
Local communication between TRAM modems and distributed system devices takes place through serial interfaces, e.g.: RS485, RS232, RS232 with TTL voltage level and CLO.
Communication can take place in transparent or buffer mode using standard protocols (e.g. MODBUS) or industry protocols.
The binary I/O ports are used to transfer information about the client device status changes (inputs), and to control remote devices (outputs). The TRAM device can also equipped with analog input with A/D converter or analog output.


TRAM modems enable sending information about events or other data (eg read-out) with use of SMS, USSD, SNMP-TRAP messages or e-mails to the predefined address.
An additional option of sending notifications when a power loss occurs is the “last gasp” optional feature.

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