Serial Parameters (RS-232 And RS-422)
91
The printer uses different response characters to represent buf fer
full and buffer empty, depending on whether it is online or o ffline.
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 remo ves the poll
character from its input data stream and discards it. After a del ay,
called the poll delay, the printer replies to the host by send ing the
appropriate response character, per the preceding table.
During a poll delay, if the printer receives another poll char acter,
the printer merely discards it. However, if a transition (fr om buffer
full to buffer empty or from online to offline) occurs during a pol l
delay, the printer sends the response character appropriate to t he
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 ch aracter to the
host every two seconds.
You can select the poll character and the poll delay time fro m the
printer control panel. You can also enable or disabl e Series 1 Idle
from the control panel. Descriptions of these parameters sta rt 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 Chara cter
Online Buffer Empty CR
Buffer Full 3
Offline Buffer Empty 0
Buffer Full 2