SJ700
2
Inverter
Appendix B
B–5
ASCII Mode Communications
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. Some commands may be broadcast to all devices 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 – 00
The 00 command controls the Forward, Reverse, and Stop mode of the inverter. You must set
parameter A002=03 in order for serial communications control of the inverter to apply.
The frame format of command 00 follows the
timing diagram and specification table.
Command
Code
Description
Broadcast to
all devices
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
C078
Transmitting
device:
STX Node
Command
Data
BCC [CR]
Frame format