SJ300 Inverter
Appendix B
B–5
Communications Protocol
Introduction to
Command List
The network master sends a frame to initiate
communications with a slave, as shown in the
figure to the right. After the set waiting time
(per parameter C078, the inverter responds.
The following table lists the commands, single-character codes sent to a particular device on
the network.
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 param-
eters and clears the trip history).
Command
Code
Description
User-selectable
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
✔
Host
(master)
wait
time
frame
Inverter
(slave)
frame
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