Communications; Irda Communications; Optional Serial Data Port - Elster A1100 Operating & Maintenance Instructions

18
A1100 - Electronic Polyphase Meter
13

COMMUNICATIONS

Communications to external equipment is provided via the IrDA (Infrared Data Association)
communications port. There is an option to provide the same absolute data via the auxiliary terminals.
13.1

IrDA Communications

The IrDA (Infrared Data Association) communications port provides one way communications,
continuously transmitting a data stream from the meter to an external device. The data stream
includes a start and end mechanism, ensuring only a complete stream of data is recorded.
An error-checking algorithm protects the integrity of the data stream. The data stream uses the OBIS
data format (see Appendix A for a description of the data format).
IrDA communications offer low cost, low power consumption and high noise immunity.
A manufacturing option allows the port to be set to transmit at one the following baud rates: 2400
(default rate), 4800 or 9600. The port will transmit over a distance of 250mm.
A typical device to read the IrDA output is a Laptop Computers with a communications probe or a
PDA with an IrDA interface.
13.2

Optional Serial Data Port

The auxiliary terminals can be configured at manufacture to transmit the same absolute data stream
as the IrDA port. The format of the data steam (See Appendix A) is non-standard 'return to zero' and
requires the use of a special external interface. If this option is used the baud rate is the same for both
ports and can be set to either 2400 or 4800 baud. The port will transmit over a distance of up to 3m.
© Elster Metering Systems - M180 001 1E - 6.2005