User manual

OceanWorks International
120 – 6741 Cariboo Road
Burnaby, BC V3N 4A3
Canada
www.oceanworks.com
Document Number: 0848-RPT002 Subsea System User Manual
Author: Graham Cunliffe Page 21 of 27 Revision 1.0
APPENDIX A – The UDP Data Structure
A.1. Introduction
The NEPTUNE system UDP data frame format is described in the following section. The
UDP frame type 102 is described, as of subsea software release v2.4.6 and later.
A.2. Number Representation
Numbers, as represented in the Rabbit microprocessor, are little-endian, hence the most
significant byte in the two byte numeric values is at the higher address of the two bytes in the
data stream.
UDP telemetry values are in ADC ticks and are integer values between 0 and 2047.
A.3. UPD Data Frame Format
The format of the raw format UDP data is as follows: