Printronix T5204R Administrator's Manual page 237

Buffer Size in K
This option configures the amount of memory allocated for the serial port
buffer. The range is 1-16 Kbytes, 32 Kbytes, and 64 Kbytes in 1-Kbyte
increments.
NOTE: If you select a baud rate that is 19200 or greater, you may need to
increase the Buffer Size in K parameter from the default to 16 Kbytes
to improve performance.
The factory default is 16.
Trickle Time
When the printer is printing data from a host and a second job is received by
the printer from a different host, Trickle Time prevents the second host from
timing out while it is waiting for its data to be printed. In order to support this
feature, the port has to be able to accept data from the host and store it for
future use.
For example, if the printer is printing a job from the serial port and then
receives a second print job from the parallel port, the data from the parallel
port will "trickle" bit by bit into the printer buffer to prevent a timeout error from
being sent back to the host connected to the parallel port.
The selected value is the time that the printer waits before getting the next
byte of data from the host. The Trickle Time value should be less than the
host time out value, but not too much shorter or else the printer fills up its
buffer too fast. This function is not applicable for C/T hotport.
The options are 1/4, 1/2, 1, 2, 4, 8, and 16 seconds and Off.
The factory default is 1/4 sec.
Timeout
This is the value used by the printer to time out from the current port and
check the other selected Port Types for data to print. When the printer has not
received data from the host after a certain period of time, it needs to time out
in order to service the other ports.
The range is from 1 to 60 seconds, and the factory default is 10 seconds.
Report Status
When a fault condition occurs in the printer, normally only the active port
reports the fault to the host. With this menu item enabled, the port will report
any fault even when it is not the current, active port.
The options are Disable (the factory default) and Enable.
SERIAL PORT Submenus
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