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SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.

SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.

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Chapter 4 Explanation of Functions<br />

4.4.1 Communication in ASCII mode<br />

(1) Communication protocol<br />

The communication between the inverter and external control system is based on the following protocol:<br />

(1)<br />

External control system<br />

Inverter<br />

C078<br />

(2)<br />

Time<br />

Waiting time (to be set with the digital operator)<br />

(1): Frame that is sent from the external control system to the inverter<br />

(2): Frame that is sent from the inverter to the external control system<br />

The inverter sends frame (2) as a response always after receiving frame (1). The inverter does not actively<br />

output any frame to the external control system.<br />

The following table lists the frames (commands) used for communication:<br />

Commands<br />

Command<br />

Function<br />

Broadcast to all<br />

stations<br />

00<br />

Instructs the inverter to drive the motor (for<br />

forward or reverse rotation) or stop the motor.<br />

○<br />

01 Sets the inverter output frequency. ○<br />

02<br />

Turns specified intelligent input terminals on<br />

or off.<br />

○<br />

03 Reads all monitored data. ×<br />

04 Reads the inverter status. ×<br />

05 Reads a specified setting item. ×<br />

06 Writes data to a specified setting item. ×<br />

07 Initializes specified settings. ○<br />

08<br />

Instructs the inverter to drive the motor (for<br />

forward or reverse rotation) or stop the motor.<br />

09<br />

Checks whether set data can be stored in the<br />

EEPROM.<br />

×<br />

0A Stores set data in the EEPROM. ○<br />

0B Recalculates the constants set in the inverter. ○<br />

○<br />

Remarks<br />

This command can operate only<br />

when "01" or "02" has been specified<br />

for the initialization mode (b084).<br />

(Otherwise, only the trip history data<br />

is cleared.)<br />

4 - 117

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