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Serial Parameters (RS-232 And RS-422)
91
The printer uses different response characters to represent buffer
full and buffer empty, depending on whether it is online or offline.
These response characters are listed in the following table:
With the SERIES 1, 1 CH protocol selected, if the printer receives a
Series 1 poll character from the host, the printer removes the poll
character from its input data stream and discards it. After a delay,
called the poll delay, the printer replies to the host by sending the
appropriate response character, per the preceding table.
During a poll delay, if the printer receives another poll character,
the printer merely discards it. However, if a transition (from buffer
full to buffer empty or from online to offline) occurs during a poll
delay, the printer sends the response character appropriate to the
new printer state at the end of the delay.
If you enable the Series 1 Idle parameter, then whenever the buffer
is less than 75% full, the printer sends a response character to the
host every two seconds.
You can select the poll character and the poll delay time from the
printer control panel. You can also enable or disable Series 1 Idle
from the control panel. Descriptions of these parameters start on
page 90.
NOTE: When using the SERIES 1, 1 CH protocol, be careful with
the transmission of binary data (control codes, bit images,
etc.) since the printer discards poll characters.
Online State Buffer State Response Character
Online Buffer Empty CR
Buffer Full 3
Offline Buffer Empty 0
Buffer Full 2