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3.4.2 Connection of meter interfaces
The meter provides data exchange with external data processing devices through its optical port and one of the
interfaces, according to the meter modification, in accordance with GOST IEC 61107-2011 protocol and DLMS (for
more details, see САНТ.411152.068-05.1 РП).
The optical port is designed in accordance with GOST IEC 61107-2011. The optical port is intended for local
connection of the meter via an optical probe connected to the PC serial port.
3.4.2.1 RS485 interface connection
The meter versions with an RS485 interface make it possible to combine up to 256 devices (meters) on one
common bus. When connecting two or more metering devices, it is necessary to assign an individual address for
each one (for details, see САНТ.411152.068-05.1 РП).
The meter’s RS485 interface connection diagram is shown in Figure 3.3.
If the ground potentials at the installation sites of meters and data concentrator units (DCU) are equal, then it is
enough to connect pin 11 to the zero potential point, otherwise take potential equalization measures.
In the event that the length of the communication lines does not exceed several meters and there are no sources
of interference, then the connection diagram can be significantly simplified by connecting the meter to the DCU or
PC using only two signal wires A and B.
The exact resistance value of the termination resistors
3
, as well as the need to use them, should be determined
during the preliminary survey of the facility. In general, if the communication line is up to 1000 m and the exchange
rate is up to 9600 bd, the use of termination resistors is not recommended
4
.
3.4.2.2 Connection of PLC, GSM, Ethernet, radio interfaces
The connection of the CE208 meter to the PC via communication modules is described in detail in
САНТ.411152.068-05.1 РП.
3
It also depends on the cable brand, its length, linear resistance, as well as the input impedance of all other receivers in the line.
4
If the termination resistor is already installed inside the data concentrator unit, it can be disconnected using the appropriate
microswitches (jumpers) of the data concentrator unit.
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