Hitachi SJ200 Series - Manual (Page 223)

SJ200 Inverter
Appendix B
B–9
No response occurs:
In the cases below, the inverter ignores a query and returns no response.
• When receiving a broadcasting query
• When detecting a transmission error in reception of a query
• When the slave address set in the query is not equal to the slave address of the inverter
• When a time interval between data elements constituting a message is shorter than 3.5
characters
• When the data length of the query is invalid
NOTE: Provide a timer in the master and make the master retransmit the same query
when no response is made within a preset time period after the preceding query was sent.