Printronix SL4M - Manual (Page 133)

INTERFACES Submenus
133
Serial Port
• 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 options for the RS-232 interface are 600,
1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200 Baud.
The factory default is 9600.
• 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 must match the corresponding
data bits setting in the host computer.
The factory default is 8.
• Stop Bits . Sets the number of stop bits in the serial data word. Either 1 or
2 stop bits can be selected. The setting must match the corresponding
stop bit setting in the host computer.
The factory default is 1.
• Parity . The options are Odd, Even, Mark, Sense, or None (factory
default). The setting must match the corresponding parity setting in the
host computer.
• Data Protocol . You can select one of the following serial interface
protocols to meet the host interface requirements.
• XON / XOFF (factory default). The printer controls the flow of
communication from the host by turning the transmission on and off.
In some situations, such as when the buffer is full or the timing of
signals is too slow or too fast, the printer will tell the host to stop
transmission by sending an XOFF character. An XOFF character is
sent when the number of empty bytes in the buffer is less than or
equal to 25 percent of the buffer size. If the host keeps sending data
after an XOFF is sent, the printer firmware will continue to send an
XOFF for every 16 characters received. When cleared, the printer will
resume receiving data (XON). The data does not have any End of
Text codes; XON / XOFF is a non-block protocol.
• ETX / ACK . End of Text / Acknowledge. The host controls the flow of
communication to the printer by sending a block of data and ending
the block with an End of Text (ETX) character. When the printer
receives the ETX character, it will acknowledge the ETX, thereby
acknowledging it has received the entire block of data.
• ACK / NAK . ACK means acknowledge; the device acknowledges it
has accepted a transmission. NAK means negative acknowledge; the
device did not receive the transmission.
• Series1 1 Char . The printer controls the flow of communication from
the host by turning the transmission on and off using response
characters sent to the host. If the number of valid bytes in the buffer
reaches 75 percent of the buffer size, the online or offline and buffer
full response character is sent. If the buffer is completely full, an
online or offline buffer full response is sent every time a character is
sent from the host. Whenever the printer state changes to online or
offline, the appropriate response character is sent. If the idle
response option is enabled, the printer will send a response character