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Table 8. I/O Channel Read Command Ending Status and Sense Bytes
Control Character
Bits Set in Ending Status Byte
Bits Set in Sense Byte
ETX (no errors detected)
Channel End, Device End
ETX(LRC or V RC error detected)
Channel End, Device End, and Unit Check
Data Check
CAN (followed by ETX)
Channel End, Device End, and Unit Check
Remote Equipment Check
ACK
Channel End, Device End
NAK (response to addressing sequence)
Channel End, Device End, and Unit Exception
NAK (response to a message)
Channel End, Device End, and Unit Check
Data Check
EOT
Channel End, Device End, and Unit Exception
No response
Channel End, Device End, and Unit Check
Timeout
48
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