B–5

SJ300 Inverter

Communications Protocol

Introduction to The network master sends a frame to initiate

Command List communications with a slave, as shown in the figure to the right. After the set waiting time

(per parameter C078, the inverter responds.

frame

Host

(master)

wait time

frame

Inverter

(slave)

Appendix

The following table lists the commands, single-character codes sent to a particular device on the network.

Command

Description

User-selectable

Code

 

 

 

 

 

 

 

 

00

Forward / Reverse / Stop command

 

 

 

01

Setting of frequency in standard profile

 

 

 

02

Setting of intelligent terminal state

 

 

 

03

Read all monitor data (block read)

 

 

 

04

Read inverter status

 

 

 

05

Read trip history

 

 

 

06

Read a single parameter value

 

 

 

07

Write a single parameter value

 

 

 

08

Set inverter parameters to default values

 

 

 

09

Verifies that the requested setting can be

 

written to EEPROM.

 

 

 

 

0A

Writes a parameter value to EEPROM

 

 

 

0B

Requests the recalculation of internal constant

 

 

 

NOTE: Use of command 08 – set inverter parameters to default values first requires setting the initialization mode parameter B084 to 01 (initializes parameters only) or 02 (initializes parameters and clears the trip history).

B