Printronix L5520 - Manual (Page 68)

Chapter 3 Host Interface Menus
68
Data Protocol
The Data Protocol parameter allows you to select the software flow
control protocol used for communications between the printer and
the host computer. You can also turn off software flow control.
Values: XON/XOFF, ETX/ACK, ACK/NAK, SERIES 1, 1 CH, or
SERIES 1, 2 CH, DTR.
This parameter must be set to match your host computer.
The actions for each of the six possible parameter values are as
follows:
XON/XOFF (default)
When you select the XON/XOFF protocol, the printer does the
following:
• When not ready to receive data (such as, offline or full data
buffer), the printer sends ASCII code DC3 (Device Code 3, hex
13, XOFF) to the host.
• When ready to receive data (such as, online and empty data
buffer), the printer sends ASCII code DC1 (Device Code 1, hex
11, XON) to the host.
NOTE: XON means “transmit on”; XOFF means “transmit off.”
ETX/ACK
The ETX/ACK protocol enables the flow of communication to the
printer by sending a block of data, and ending the block with an End
of Text (ETX) signal. When the printer receives the ETX signal, it
acknowledges the signal, thereby indicating it has received the
entire block of data.
ACK/NAK
The ACK/NAK protocol gives the printer a means to acknowledge it
has either accepted a transmission (ACK) or did not receive a
transmission (NAK).