Hitachi SJ700B Series Instruction Manual page 186

(2) Positive and negative responses
(i) Positive response
- Response frame
Frame format
STX Station No.
STX Control code (Start of TeXt)
Station number of control-target
Station No.
inverter
ACK Control code (acknowledgement)
BCC Block check code
CR Control code (Carriage Return)
(ii) Negative response
- Response frame
Frame format
STX Station No.
STX Control code (Start of TeXt)
Station number of control-target
Station No.
inverter
Control code (negative
NAK
acknowledgement)
Error code Content of communication error
BCC Block check code
CR Control code (Carriage Return)
Note 15: Error codes
Error code
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.
ACK BCC
Description
NAK Error code
Description
-
-
-
-
-
-
Chapter 4 Explanation of Functions
CR
Data size
1 byte STX (0x02)
2 bytes 01 to 32
1 byte ACK (0x06)
XOR of the items from "Station No." to "ACK."
2 bytes
See Item (3) of this section.
1 byte CR (0x0D)
BCC CR
Data size
1 byte STX (0x02)
2 bytes 01 to 32
1 byte NAK (0x15)
2 bytes See Note 13.
XOR of the items from "Station No." to "Error
2 bytes
code." See Item (3) of this section.
1 byte CR (0x0D)
Description
4 - 127
Setting
Setting