Communications Reference Information; Inverter Affirmative Reply; Inverter Negative Reply - Hitachi L300P Series Instruction Manual

Communications Reference Information

Inverter
The standard affirmative reply from the inverter
Affirmative Reply uses the ACK character (acknowledge) in the data
field. The frame format of this reply follows the
diagram and specification table.
STX
Node
ACK
BCC
[CR]
Inverter
The standard negative reply from the inverter
uses the NAK character (negative acknowl-
Negative Reply
edge) in the data field. The frame format of
this reply follows the diagram and specifica-
tion table.
STX
Node
NAK
Error code
BCC
[CR]
The error codes for a NAK (negative acknowledge) are:
Element Description
Control code (STart of TeXt)
Node (station) address of inverter
Control code (ACKnowledge)
Block check sum code
Control code (carriage return)
Element Description
Control code (STart of TeXt)
Node (station) address of inverter
Control code
(Negative ACKnowledge)
Code representing error type
Block check sum code
Control code (carriage return)
Error
Error Description
Code
01H Parity error
02H Check sum error
03H Framing error
04H Overrun error
05H Protocol error
06H ASCII code error
L300P Inverter
Frame format
STX Node ACK
Size Value
1 byte STX (0x02)
2 bytes 01 to 32
1 byte ACK (0x06)
2 bytes Exclusive OR of Node and ACK
1 byte [CR] (0x0D)
Frame format
Error
STX Node NAK
code
Size Value
1 byte STX (0x02)
2 bytes 01 to 32
1 byte NAK (0x15)
2 bytes (See next table below)
2 bytes Exclusive OR of Node, Data,
and NAK
1 byte [CR] (0x0D)
Error
Error Description
Code
07H Receive buffer overrun error
08H Receive time-out error
11H Abnormal command code error
13H Test error code
16H Abnormal parameter code/value
error
— —
B–17
BCC [CR]
BCC [CR]