Rockwell-automation 2092-DAx Ultra1500 Host Commands for Serial Commun Manual do Utilizador descarregar pdf (Página 11)

1 Publication 2092-RM001A-EN-P — March 2005

Chapter

Communications Protocol

Introduction

The drive command protocol is a master - slave protocol. The host computer

is the master and the drive is the slave. This chapter provides details about the

Special Symbols, Packet Structure, and Checksum for the Ultra serial

communications protocol.

Special Symbols

Special symbols used in the host commands include:

Packet Structure

The packet structure is shown below:

Some simple commands might not have the Data field (e.g., Fault Reset).

Maximum packet size is 400 bytes. Each letter and digit in Command and Data

fields represents a single ASCII character.

All commands begin with an STX, and terminate with an ETX.

Symbol Value Description

STX 0x02 Start of Transmission

ETX 0x03 End of Transmission

ACK 0x06 Command Acknowledged

GS 0x29 Cannot change the value of the parameter while drive is enabled.

RS 0x30 Value is out of range

US 0x31 Invalid command

NAK 0x15 Communication Error (Checksum Error)

Start ID Host/

Response

Command Data Separator Checksum End

symbol STX dd # / $ SET or… d … d : c c ETX

bytes 1 2 1 3 0 - n 1 1 1

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 69 70

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Rockwell-automation 2092-DAx Ultra1500 Host Commands for Serial Commun Manual do Utilizador Página 11