Hitachi SJ700-4000HFU2

Chapter 4 Explanation of Functions
4-127
(2) Positive and negative responses
(i) Positive response
- Response frame
Frame format
STX
Station No.
ACK
BCC
CR
Description
Data size
Setting
STX
Control code (Start of TeXt)
1 byte
STX (0x02)
Station No.
Station number of control-target
inverter
2 bytes
01 to 32
ACK
Control code (acknowledgement)
1 byte
ACK (0x06)
BCC
Block check code
2 bytes
XOR of the items from "Station No." to "ACK." See
Item (3) of this section.
CR
Control code (Carriage Return)
1 byte
CR (0x0D)
(ii) Negative response
- Response frame
Frame format
STX
Station No.
NAK
Error code
BCC
CR
Description
Data size
Setting
STX
Control code (Start of TeXt)
1 byte
STX (0x02)
Station No.
Station number of control-target
inverter
2 bytes
01 to 32
NAK
Control code (negative
acknowledgement)
1 byte
NAK (0x15)
Error code
Content of communication error
2 bytes
See Note 13.
BCC
Block check code
2 bytes
XOR of the items from "Station No." to "Error code."
See Item (3) of this section.
CR
Control code (Carriage Return)
1 byte
CR (0x0D)
Note 15: Error codes
Error code
Description
01H
Parity error
02H
Sum check error
03H
Framing error
04H
Overrun
05H
Protocol error
06H
ASCII code error
07H
Receiving-buffer overflow
08H
Reception timeout
-
-
-
-
11H
Command error
12H
-
13H
Execution disabled
14H
-
15H
-
16H
Parameter error
17H
-
If a command is broadcasted to all inverter stations, no response will be returned to the external control system.