AMT Datasouth 41AY89AR777 - Manual (Page 47)

FIFO not full FIFO full
DSTR
\J
BUSY F
ACK
DSTR
\J
]__ BUSY ________ P
IT
ACK
Figure 2.2 Handshake on ACK
When Feature 59 is set to 1, the last character to cause BUSY to go high is
acknowledged (see Figure 2.3). In this case the host must honor BUSY.
FIFO not full FIFO full
DSTR
~u
DSTR
BUSY
J L
BUSY
ACK M ACK
IT
Figure 2.3 Handshake on BUSY
2.5.25 Feature 61 - EIGHTH BIT ENABLE
When Feature 61 is set to 1, the printer will process the eighth bit when
communicating with an 8-bit device. When Feature 61 is set to 0, the printer will
ignore the eighth bit.
2.5.26 Feature 63 - ETX/ACKNOWLEDGE HANDSHAKING
When communicating over the serial interface the operator may set Feature 63 to
enable an ETX/ACKNOWLDGE handshaking. When Feature 63 is set to 1,
handshaking wiQ occur as follows: The host will end each series of data sent to
the printer with ETX. When the printer detects ETX in the First-In First-Out
buffer, it sends acknowledge to the host.
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