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Transmission start
Message transmission command
Local node
Message=11 bytes
Another node
Message+response=12 bytes
Re-transmission
Re-transmission
Local node
Message=11 bytes
Message=11 bytes
Figure 6-18 Maximum NOACK Interrupt Generation
6.11
Response Transmission Standby Error Interrupt (NRSP)
This flag is set when an IFR type 3 message was received, but the response data length (address
14H) has not been written.
If the response data length is written before the “EOD” bit of the received message, the response
transmission error flag is not set.
Once the response data length is written, the IFR type 3 response transmission standby status is
held until the IFR type 3 message is received and an IFR type 3 response is sent. Even if a message,
other than an IFR type 3, is received or transmitted after the response data length is written, it is
not necessary to write the response data length again. The written response data length is reset
by an RES terminal input.
Interrupt generation timing is shown below.
LAN bus
Message
EOD
42.5msec
INT
Figure 6-19 NRSP Interrupt Generation Timing
6-15