Printronix L1524 - Manual (Page 71)

3–31 Configuring the Printer
The Data Protocol parameter allows you to select the software flow control
protocol.
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 (i.e. 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 (i.e. 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).
SERIES 1, 1 CH
When you select the Series 1 with 1 Character protocol, the printer does the
following:
•
When not ready to receive data (buffer 75% full) the printer sends a
buffer full response character to the host.
•
When ready to receive data (buffer drops to 50% full), the printer sends a
buffer empty response character to the host.
•
If the buffer ever fills completely, the printer sends a buffer full response
character to the host every time it receives a character from the host.
•
In addition, whenever the printer state changes from online to offline (or
vice versa), the printer sends the appropriate response character to the
host.