Communications Reference Information - Hitachi SJ7002 Series Instruction Manual

B–18

Communications Reference Information

Communications Reference Information

Inverter
Affirmative Reply
Inverter
Negative Reply
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The standard affirmative reply from the inverter
uses the ACK character (acknowledge) in the data
field. The frame format of this reply follows the
diagram and specification table.
Element Description
STX Control code (STart of TeXt)
Node Node (station) address of inverter
ACK Control code (ACKnowledge)
BCC Block check sum code
[CR] Control code (carriage return)
The standard negative reply from the inverter
uses the NAK character (negative acknowl-
edge) in the data field. The frame format of
this reply follows the diagram and specifica-
tion table.
Element Description
STX Control code (STart of TeXt)
Node Node (station) address of inverter
NAK Control code
(Negative ACKnowledge)
Error code Code representing error type
BCC Block check sum code
[CR] Control code (carriage return)
The error codes for a NAK (negative acknowledge) are:
Error
Error Description
Code
01H Parity error
02H Check sum error
03H Framing error
04H Overrun error
05H Protocol error
06H ASCII code error
If a host computer broadcasts a command to all inverter stations, no response will be returned
to the host.
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 Execution disabled
16H Abnormal parameter code/value
error
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BCC [CR]
BCC [CR]