Hitachi SJ700-2 - Manual (Page 182)

Chapter 4 Explanation of Functions
4.4.1 Communication in ASCII mode
(1) Communication protocol
The communication between the inverter and external control system is based on the following protocol:
(1)
Time
External control system
Inverter
C078
(2)
Waiting time (to be set with the digital operator)
(1): Frame that is sent from the external control system to the inverter
(2): Frame that is sent from the inverter to the external control system
The inverter sends frame (2) as a response always after receiving frame (1). The inverter does not
actively output any frame to the external control system.
The following table lists the frames (commands) used for communication:
Commands
Command Function
Broadcast to all
stations
Remarks
00
Instructs the inverter to drive the motor (for
forward or reverse rotation) or stop the motor.
○
01 Sets the inverter output frequency. ○
02
Turns specified intelligent input terminals on
or off.
○
03 Reads all monitored data. ×
04 Reads the inverter status. ×
05 Reads a specified setting item. ×
06 Writes data to a specified setting item. ×
07 Initializes specified settings. ○
08
Instructs the inverter to drive the motor (for
forward or reverse rotation) or stop the motor.
○
This command can operate only
when "01" or "02" has been specified
for the initialization mode (b084).
(Otherwise, only the trip history data
is cleared.)
09
Checks whether set data can be stored in the
EEPROM.
×
0A Stores set data in the EEPROM. ○
0B Recalculates the constants set in the inverter. ○
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