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Service in GSM for wireless transmission of data at 9 600 bps full duplex. Connections can
be established to other GSM devices, to analog modems or to ISDN modems in the fixed
network. The connection establishment can be started at both ends. Only dial-up
connections are supported.
CTS
Clear to send
Signal in the data flow control
Data messages
The actual transmission of data takes the form of data messages. These contain a fixed
amount of a specific information type.
There are status messages, analog value messages, counted value messages, command
messages, setpoint messages, parameter messages and data messages for the various
information types.
DCF77 radio clock
DCF77 is a time signal transmitted on the normal frequency 77.5 kHz as encoded time
information. Reception of the time signal is restricted to Western Europe.
Some TIM variants (TIM 4VD, TIM 42D, TIM 43D, TIM 44D, TIM 4RD) are equipped with a
DCF77 receiver module that can receive the DCF77 time signal either over an indoor or
outdoor antenna. The ST7 time management currently requires the existence of a DCF77
time signal to allow time synchronization of the stations and the control center throughout a
network.
For applications that cannot receive the DCF77 time signal, SINAUT provides a GPS
receiver module with a GPS outdoor antenna that converts the GPS Time signal for the
DCF77 receiver module.
Direct communication
With direct communication, the S7 stations communicate directly with each other without the
frames needing to be forwarded by a master station or station.
Compare "inter-station communication"
Context: Telecontrol / SINAUT
DNP
Distributed Network Protocol
DNP3 protocol
The DNP3 protocol is a telecontrol protocol that allows the process data of sensors, field
devices and RTUs to be connected to operator control and monitoring systems. The protocol
was first specified in 1990. In 1993, this specification was released for general use under a
SINAUT ST7 station control system
System Manual, 09/2016, C79000-G8976-C178-10
Glossary
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