Communication In Ascii Mode - Hitachi SJ700D-004L Instruction Manual

Chapter 4

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:
External control system
Inverter
(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
Instructs the inverter to drive the motor (for
00
forward or reverse rotation) or stop the motor.
01 Sets the inverter output frequency.
Turns specified intelligent input terminals on or
02
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.
Instructs the inverter to drive the motor (for
08
forward or reverse rotation) or stop the motor.
Checks whether set data can be stored in the
09
EEPROM.
0A Stores set data in the EEPROM.
0B Recalculates the constants set in the inverter.
(1)
C078
Waiting time (to be set with the digital operator)
Function
4-116
Explanation of Functions
Time
(2)
Broadcast to all
stations
Available
Available
Available
Not available
Not available
Not available
Not available
Available
This command can operate only when
"01" or "02" has been specified for the
Available initialization mode (b084).
(Otherwise, only the trip history data is
cleared.)
Not available
Available
Available
Remarks