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Operating & Maintenance Instructions 35

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APPENDIX A

A1 IrDA Data Serial Output

The A100C’s IrDA port and optional Serial Data Port are transmit only. The ports transmit

billing, security and status data once every second.

The data rate is programmed at time of manufacture and is dependent on the meter port

configuration.

Baud rates for the following port configurations are available:

IrDA Port Only 9600 baud 4800 baud 2400 baud

IrDA and Serial Port - 4800 baud 2400 baud

The character format is one start bit, followed by 8 data bits and one stop bit (no parity).

The IrDA output data adheres to the following format:

SOH

NULL

LEN

STX

DATA[LEN]

NN NN …

ETX

BCC

SOH Start of header character (hex 01).

NULL Null character hex 00

LEN Data length (hex 00-FF). Indicates the number of bytes between ETX and STX,

exclusive.

STX Start of text character (hex 02).

DATA[LEN] Meter registration, security and status data. Format is defined below

ETX End of text character (hex 03).

BCC Binary checksum of all message bytes from SOH to ETX (inclusive).

NOTE: For multi-byte binary data items, the data is transmitted in little-endian format – the

least significant byte first, the most significant byte last.

For BCD data items, the most significant byte is transmitted first, with the most significant

decimal digit in the most significant nibble.

For ASCII data items, the left-most character of a text string is transmitted first.

Elster A100C User Manual

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