Command – 04 - Hitachi SJ300 Series Instruction Manual

B–10
Communications Protocol
Command – 04
The 04 command reads the status of the inverter.
The frame format of command 04 follows the
diagrams and specification tables. The transmit
frame has no data field.
Element Description
STX Control code (STart of TeXt)
Node Node (station) address of inverter
Command Transmission command
BCC Block check sum code
[CR] Control code (carriage return)
The receive frame has an 8-byte data field,
containing values for three trip items (plus a
reserved field).
Element Description
STX Control code (STart of TeXt)
Node Node (station) address of inverter
Data Transmission data
BCC Block check sum code
[CR] Control code (carriage return)
Trip data is organized as shown. The
table below lists the codes and their
meanings.
Code Status A Definition
00 Initial status
01 —
02 On Stopping
03 On running
04 On free-run stop
05 On jog
06 On dynamic braking
07 On retry
08 On trip
09 On under-voltage
10 —
Transmit frame format
STX Node
Size
1 byte STX (0x02)
2 bytes 01 to 32
2 bytes 04
2 bytes Exclusive OR of Node,
Command, and Data
1 byte [CR] (0x0D)
Receive frame format
STX Node
Size
1 byte STX (0x02)
2 bytes 01 to 32
8 bytes (see next table)
2 bytes Exclusive OR of Node,
Command, and Data
1 byte [CR] (0x0D)
Data field contents
Status A Status B
Status B Definition
On stopping
On running
On tripping
—
—
—
—
—
—
—
—
Command BCC [CR]
Value
Data BCC [CR]
Value
Status C (reserved)
Status C Definition
—
Stop
Deceleration speed
Constant speed
Acceleration speed
Forward
Reverse
Reverse from forward
Forward from reverse
Forward start
Reverse start