Printronix SL4M - Manual (Page 134)

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Chapter 4 INTERFACES Menu
every two seconds while the number of valid bytes in the buffer is less
than 75 percent of the buffer size. If a poll character is received
(configurable from the Poll Character
xx Hex option on the front panel
from hex 0 through FF), the printer will send a response character n
milliseconds later (configurable from the Poll Character
xx MS on the
front panel from 0 through 30). This n milliseconds is called the poll
delay. The poll character will be removed from the input data stream
and will not be processed. This may cause problems with the
transmission of binary data (e.g., control codes, bit image, etc.). If a
poll delay is started due to the receipt of a poll character and another
poll character is received, the second poll character has no effect and
is removed from the input data stream. If a transition (from buffer full
to empty or online to offline) occurs during a poll delay, the new
printer state will be sent at the end of the poll delay.
The response characters are described below.
• Series1 2 Char. This protocol behaves exactly the same as the
Series 1 Char except there is a two-character response to the host.
The response characters are described in the following table:
Printer State Response
Online and Buffer Empty CR
Online and Buffer Full 3
Offline and Buffer Empty 0
Offline and Buffer Full 2
Printer State Response
Online and Buffer Empty 1 CR
Online and Buffer Full 3 CR
Offline and Buffer Empty 0 CR
Offline and Buffer Full 2 CR