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I/O Channel Sequences
and Responses
2845 Address
Addressing
EOT
}
Printer Address
Sequence
Specific Poll Command (Hex
=
40)
I
STX
Text
ETX
LRC
I
STX
Text
ETX
LRC
EOT
SOH
I
SOH
*
Sets Printer Request.
** Indicates printer-buffer overrun.
EOT
NAK
I
I
I
I
I
I
I
-,
I
I
I
14
I
I
I
I
No Response
No Response
t See "Error Recovery Procedures" for further I/O channel responses.
Figure 7. Specific Poll to Printer, Sequence/Response Diagram
32
I
NAK*
Printer
2845 Sequences
and Responses
I
I
EOT*
STX
Printer
Printer Address
Not Ready Busy
ETX
LRC
ACK
I
NAKt
EOT**t
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