Tristar Modbus Specification

TriStar MODBUS Specification Morningstar Corporation V.1.0.0 05 SEPT 2003

TriStar MODBUS Specification

V.1.0.0

Contents
PARAMETERS..................................................................................................................................................... 3 SUPPORTED MODBUS FUNCTIONS............................................................................................................. 4 READ HOLDING REGISTERS (0X03) AND READ INPUT REGISTERS (0X04) ........................................................... 4 READ COILS (0X01), READ DISCRETE INPUTS (0X02), WRITE SINGLE COIL (0X05)............................................ 6 WRITE SINGLE REGISTER (0X06)......................................................................................................................... 7 READ DEVICE IDENTIFICATION (0X2B, SUBCODE 0X0E) ..................................................................................... 7 VARIABLES AND DEFINITIONS .................................................................................................................... 8 READ HOLDING AND READ INPUT REGISTERS..................................................................................................... 8 EEPROM VALUES ............................................................................................................................................ 11 CALIBRATION VALUES ....................................................................................................................................... 19 COILS................................................................................................................................................................. 20 EXAMPLES ........................................................................................................................................................ 22 SCALING............................................................................................................................................................ 22 APPENDIX.......................................................................................................................................................... 23 ALARM BITS TABLE ........................................................................................................................................... 23FAULT BITS TABLE ............................................................................................................................................ 23 LIGHTING BITS CONFIGURATION ....................................................................................................................... 24REFERENCES.................................................................................................................................................... 27

http://www.morningstarcorp.com

2/27

8 September 2003

TriStar MODBUS Specification

V.1.0.0

Parameters
The TriStar supports communication via its serial RS-232 interface and uses the industry standard MODBUS application protocol. This document assumes the user is familiar with the MODBUS protocol and itsterminology. Please refer to the documents listed in the References section for more information. Modbus™ is a trademark of Modicon, Inc. The TriStar supports RTU mode only. 16bit MODBUS addresses (per the modbus.org spec) The serial communication parameters are BPS: 9600 baud Parity: None Data bits: 8 Stop bits: 2 Flow control: None All addresses listed are for the request PDU. The TriStar defaultsto server address of 0x01.

http://www.morningstarcorp.com

3/27

8 September 2003

TriStar MODBUS Specification

V.1.0.0

Supported Modbus Functions
Read Holding Registers (0x03) and Read Input Registers (0x04)
RAM
PDU Addr 0x0000 0x0001 0x0002 0x0003 0x0004 0x0005 0x0006 0x0007 0x0008 0x0009 0x000A 0x000B 0x000C 0x000D 0x000E 0x000F 0x0010 0x0011 0x0012 0x0013 0x0014 0x0015...