Communication In Ascii Mode - Hitachi SJ700B Series Instruction Manual

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:
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
02
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.
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
Time
(2)
Broadcast to all
stations
○
○
○
×
×
×
×
○
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.)
×
○
○
Remarks