Serial Parameters (RS-232 And RS-422)
89
Host Protocol
The Host Protocol parameter allows you to select the software flow
control protocol used for communications between the printer an d
the host computer. You can also turn off software flow control.
Values: None, XON/XOFF, ETX/ACK, ACK/NAK, ENQ/ACK,
SERIES 1, 1 CH, or SERIES 1, 2 CH.
This parameter must be set to match your host computer.
The actions for each of the seven possible pa rameter values are as
follows:
None (default)
When you select None, the software flow control between the
printer and the host is disabled.
XON/XOFF
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 r eceived the
entire block of data.