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TABLE OF CONTENTS

INTRODUCTION....................................................................................................6

ACKNOWLEDGEMENTS ......................................................................................6

DATA COMMUNICATIONS OVERVIEW...............................................................7

DSE P810 description .................................................................................................................. 7

RS232 description........................................................................................................................ 7

RS485 description........................................................................................................................ 8

Communication protocol description ........................................................................................ 8

GENERAL DEFINITIONS AND REQUIREMENTS OF GENCOMM......................9

MULTIPLE MASTERS...........................................................................................9

MODBUS FUNCTIONS USED.............................................................................10

Function 3 - Read Multiple Registers....................................................................................... 10

Query message......................................................................................................................... 10

Normal response message....................................................................................................... 10

Exception response message .................................................................................................. 11

Unimplemented register and field values ................................................................................. 11

Sentinel values for instrumentation .......................................................................................... 12

Function 16 - Write Multiple Registers..................................................................................... 13

Query message......................................................................................................................... 13

Normal response message....................................................................................................... 13

Exception response message .................................................................................................. 13

EXCEPTION RESPONSES..................................................................................14

Exception response message .................................................................................................. 14

Extended exception codes........................................................................................................ 15

LANGUAGE CODES ...........................................................................................18

Language codes ....................................................................................................................... 18

MODBUS REGISTERS DEFINED .......................................................................22

Index of Register Pages............................................................................................................. 23

GENCOMM PAGE 0 - COMMUNICATIONS STATUS INFORMATION..............24

Registers ..................................................................................................................................... 24

Password status ....................................................................................................................... 25

EXAMPLE : Reading the password status from the control module. ....................................... 25

GENCOMM PAGE 1 - COMMUNICATIONS SETTINGS.....................................26

Notes on passwords.................................................................................................................. 26

Registers ..................................................................................................................................... 27

Baud rate .................................................................................................................................. 28

EXAMPLE : Using Link500Plus to change module slave ID and Baud rate ............................ 29

EXAMPLE : Sending a password to the control module. ......................................................... 30

Deep Sea Electronics Plc 5220 User Manual

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