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4.2 Parameters and reading out meter data
Communication with the EM4TII+ follows the standard IEC 62056-21 (formerly IEC 61107).
Knowledge of this standard is assumed for the development of any kind of terminal software dedicated
to read the meter data.
All data objects are identified here by the OBIS Code System (formerly EDIS code system).
OBIS codes are given here in part as a full 6-digit code. On the possibly shortened reference OBIS
codes are referred to in this document, if any.
4.2.1 Protocol diagram
Here is a representation of a possible communication between the train computer or communication
unit and the EM4TII+ to select the load profile:
Command message: e.g.: Request for
load profile data from 31/1/2013, 08:00
to 1/2/2013, 08:00
<SOH> R5 <STX> P.01
(01301310800;01302010800)
<ETX> <BCC>
Request message
/ ? ! <CR> <LF>
Identification message
/EMH5\@D4EM4TWII001--<CR> <LF>
Acknowledgement/option select message
<ACK> 051 <CR> <LF>
Acknowledgement of baud rate selection
<SOH>P0<STX>()<ETX>
Data message
<STX> LP data block <ETX> <BCC>
Communication Master EM4TII+
Command message: password message
<SOH> P1 STX (00000000) <ETX>
Acknowledgement message
<ACK>
Command message: end of communication
<SOH> BO <ETX> <BCC>
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