25
Instruction Manual
CIRWATT B 101-102
4 - COMMUNICATIONS
CIRWATT B 102
energy meter has an RS-485 communications port which is used to connect various
energy meters to the same bus.
4�1 - OPTICAL COMMUNICATIONS PORT
CIRWATT B101-102
single-phase energy meters have an optical serial communications port, in com-
pliance with the EN 62056-21:2003 standard. The communications port is fully compatible with the
certified optical heads approved by the major utilities companies, in compliance with the EN 62056-21
Standard.
On the surface of the cover there is a magnetic profile for the correct fastening and location of optical
heads.
4�2 - RS-485 COMMUNICATIONS (MODEL B 102)
This type of communications method is used to create a communications bus for up to 32 devices, with
a maximum installation distance of 1,200 metres.
Figure 11: RS-485 Bus�
4�3 - MODBUS MEMORY MAP (MODEL CIRWATT B 102)
The
CIRWATT B102
energy meter has a series of instructions in the MODBUS protocol that can inte-
grate these energy meters within a network with a MASTER peripheral device that will query data in
this protocol.
The standard meter goes with the protocol IEC 62056-21 into the RS-485 communication bus. By re-
quest,
CIRCUTOR
can provide the meter with Modbus communications.
shows the Modbus memory map.
