Optical Interface; Data Readout - Landis+Gyr E350 Series User Manual

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5.4

Optical Interface

Access to module
over optical interface
Blocking
5.5

Data Readout

© Landis+Gyr
currently measured value. The number of pulses per time unit depends on
the meter constant (as stated on the faceplate). When registering energy,
the pulse output LEDs will flash at a rate of 1 pulse per Wh or varh of
energy recorded. The pulse width is 10 ms.
Fig. 5.6 Pulse output LEDs and optical interface
All meters have an optical communications interface (see Fig. 5.6). If the
communication module supports this function, both meter and module can
be accessed via optical interface. In this case, the communication module
has to be addressed.
The optical interface allows reading the meter's registers and identity in the
field using a suitable device (PDA or laptop computer). The readout list is in
full accordance with the provisions of IEC62056-21. The optical interface is
normally closed, a wake-up string is sent to the meter, which activates the
readout list.
With this communication channel, firmware can be downloaded to the
module. Additionally, an external user can send commands to the module
and upload data from the module via the optical interface. All
communication is half-duplex, i.e. data can either be transmitted or
received at any point in time.
If the module communicates with the optical interface, the meter will not
accept sign-ons from either the optical interface or the AMR interface. If the
module wants to read the meter, it must terminate the optical interface 
module communication.
The module communicates normally via dlms.
Access to module over the optical interface of the meter is possible with
meters whose serial number is 11117214 or higher.
Open communications with 7 bit, even parity, 1 stop bit, 4800 bps.
This can be used to read out the module over the optical meter interface or
to set the TOU table of the module.
The optical interface can be blocked using a formatted command issued
from the communication module or the optical interface. This is to improve
security be blocking any local access to the meter.
The power supplier can read the meter data, particularly the energy
consumption, locally in two ways:
Optical interface
Pulse output LED active energy
Pulse output LED reactive energy
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Operation