Hitachi SJ300 Series

Communications Protocol
Appendix B
B–6
Command – 00 The 00 command controls the Forward, Reverse and Stop mode of the inverter. You must set
parameter A002=03 in order for serial communications control of the inverter to apply.
The frame format of command 00 follows the
timing diagram and specification table.
The example below shows a transmission to the inverter at address Node 1 to rotate the motor
in the forward direction.
Command – 01 The 01 command sets the output frequency for the standard profile. You must set parameter
A002=03 in order for serial communications control of the inverter to apply.
The frame format of command 01 follows the
timing diagram and specification table.
The example below shows a transmission to the inverter at address Node 1 to set the output
frequency for 5 Hz. We use a value of 500 in ASCII to represent 5.00 Hz.
Element Description Size Value
STX Control code (STart of TeXt) 1 byte STX (0x02)
Node Node (station) address of inverter 2 bytes 01 to 32, and FF (broadcast to all
nodes)
Command Transmission command 2 bytes 00
Data Transmission data 1 byte 00 = Stop command
01 = Forward command
02 = Reverse command
BCC Block check sum code 2 bytes Exclusive OR of Node,
Command, and Data
[CR] Control code (carriage return) 1 byte [CR] (0x0D)
STX Node Command Data BCC [CR]
Frame format
(STX) | 01 | 00 | 1 | (BCC) | [CR]
to ASCII
02 | 30 31 | 30 30 | 31 | 33 30 | 0D
Element Description Size Value
STX Control code (STart of TeXt) 1 byte STX (0x02)
Node Node (station) address of inverter 2 bytes 01 to 32, and FF (broadcast to all
nodes)
Command Transmission command 2 bytes 01
Data Transmission data 6 bytes ASCII code for ten times the
frequency (accommodates two
decimal places)
BCC Block check sum code 2 bytes Exclusive OR of Node,
Command, and Data
[CR] Control code (carriage return) 1 byte [CR] (0x0D)
STX Node Command Data BCC [CR]
Frame format
(STX) | 01 | 01 | 000500 | (BCC) | [CR]
to ASCII
02 | 30 31 | 30 31 | 30 30 30 35 30 30 | 30 35 | 0D