Hitachi SJ7002 Series Instruction Manual page 290

B–6
ASCII Mode Communications
Command – 01
Element Description
STX Control code (STart of TeXt)
Node Node (station) address of inverter
Command Transmission command
Data Transmission data
BCC Block check sum code
[CR] Control code (carriage return)
The example below shows a transmission to the inverter at address Node 1 to rotate the motor
in the forward direction.
(STX) | 01 | 00 | 1 | (BCC) | [CR]
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.
Element Description
STX Control code (STart of TeXt)
Node Node (station) address of inverter
Command Transmission command
Data Transmission data
BCC Block check sum code
[CR] Control code (carriage return)
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.
(STX) | 01 | 01 | 000500 | (BCC) | [CR]
When using the data as the feedback (process variable) for PID control, set the most significant
byte to ASCII "1." The following example transmits the data "5%."
(STX) | 01 | 01 | 000500 | (BCC) | [CR]
Size
1 byte
2 bytes 01 to 32, and FF (broadcast to all
2 bytes 00
1 byte
2 bytes Exclusive OR of Node,
1 byte
to ASCII
02 | 30 31 | 30 30 | 31 | 33 30 | 0D
Frame format
STX Node
Size
1 byte
2 bytes 01 to 32, and FF (broadcast to all
2 bytes 01
6 bytes ASCII code for ten times the
2 bytes Exclusive OR of Node,
1 byte
to ASCII
02 | 30 31 | 30 31 | 30 30 30 35 30 30 | 30 35 | 0D
to ASCII
02 | 30 31 | 30 31 | 31 30 30 35 30 30 | 30 35 | 0D
Value
STX (0x02)
nodes)
00 = Stop command
01 = Forward command
02 = Reverse command
Command, and Data
[CR] (0x0D)
Command Data BCC [CR]
Value
STX (0x02)
nodes)
frequency (accommodates two
decimal places)
Command, and Data
[CR] (0x0D)