55xGenComm1_29
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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
