(6） Transmission frame error (Master receive)
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| ENQ code (05H) | 1 |
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| 2 | ACK code (06H) |
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| Read command (ASCII code) | 3 |
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| HITACHI |
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| 4 | ACK code (06H) |
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| 5 | Read data (ASCII code) | 6 |
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| Slave |
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| 3 second |
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| Read data (ASCII code) | elapse |
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7 |
| Master (PC) | |||
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| 3 second |
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| Read data (ASCII code) | elapse |
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| 3 second |
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| Read data (ASCII code) | elapse |
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| 8 |
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① | Session starts when ENQ is sent from master to slave. |
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② | Slave acknowledges by returning ACK to master. |
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③ | Master sends read command. |
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④ | Slave returns ACK code to acknowledge read command. |
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⑤ | Slave sends read data to master. |
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⑥ | For some reason, master fails to receive read data. |
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⑦ | Slave fails to receive acknowledgment of read data and attempts to resend every 3 seconds for 3 | ||||
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⑧ | After the third failure, slave aborts the sequence and ends communication. |
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