Printronix L5520 - Manual (Page 71)

Serial Parameters (RS-232 and RS-422)
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DTR Protocol
The printer controls the data flow by sending this hardware signal to
the host. If there is enough room in the printer buffer, the printer will
send a high signal; if the buffer is full, the printer will send a low
signal. DTR tells the host if it is safe to send more data. (If the host
sends data during an unsafe condition, data will be lost.) DTR is not
available when RS-422 is selected.
Baud Rate
Sets the baud rate of the serial interface in the printer. Baud rate is
the speed at which serial data is transferred between the host
computer and the printer. The choices for the RS-232 and RS-422
interfaces are 600, 1200, 2400, 4800, 9600, 19,200, 38,400,
57,600, 115,200 Baud.
NOTE: If you select a baud rate that is greater than 19200, you will
need to use RS-422 to prevent data loss.
Word Length
Sets the length of the serial data word. The length of the data word
can be set to 7 or 8 bits, and much match the corresponding data
bits setting in the host computer.
Stop Bits
Values: 1 (default) or 2.
This parameter must be set to match your host computer.
Stop bits signal the end of a transferred serial data word.
Parity
Values: None (default), Odd, Even, Mark and Sense.
This parameter must be set to match your host computer.
The host may send a parity bit with every data word. The parity bit
is used for error checking.