Appendix B: Glossary - Black Box LE3840A Manual

Baud Rate—Indicates the speed in bits per second at which the port sends
data to another serial port. Baud rate choices are 300, 1200, 2400, 4800,
9600 (default), or 19200.
Cable Length—Used to specify the length of cable between a parallel printer
and the Ethernet Print Server unit. If the cable is 25 feet (7.6 m) or less, then
use the short cable setting. If the cable is 25 feet to 100 feet (7.6 tp 30.5 m),
then use the long cable setting.
Data Bits—Number of bits in a serial character. It can be 7 or 8 (default).
End of Job Message (EOJ)—A string of characters sent to a port at the end of
a print job. Typically, this is used to reset the printer to its normal (default)
operating mode. For example, an EOJ message is automatically sent to the
Ethernet Print Server when a data path is terminated or when a timeout
occurs.
The contents of a printer's reset string vary by printer type. See your
printer's Owner's Manual to determine your printer's reset command.
Handshaking—Handshaking, both hardware (Ready/Busy) and software
(Xon/Xoff), is the method use by most devices for controlling the
transmission of data.
• Handshaking for parallel devices: Ready/Busy allows data to be sent
whenever the printer is not using the busy line in the cable. Ready/Busy
and ACK will not allow a character to be sent to the printer unless an ACK
signal is received.
• Handshaking for serial devices: Choices include:
Ready/Busy and Xon/Xoff—The hardware handshake (Ready/Busy) will
not output data when Data Terminal Ready (pin 20) is low. It expects the
attached device to stop sending when it drops Clear to Send (pin 5), Data
Set Ready (pin 6), and Data Carrier Detect (pin 8). This type of protocol
is especially useful for managing the signals constantly being sent between
devices. This is the only protocol used for PCs. The software handshake
(Xon/Xoff) will not output data when it receives a Control Q (XON).
This is crucial for managing data flow between two devices, so that data
does not overflow the buffer and become lost.
Ready/Busy only—The hardware handshake (Ready/Busy) will not
output data when Data Terminal Ready (pin 20) is low. It expects the
attached device to stop sending when it drops Clear to Send (pin 5),
Data Set Ready (pin 6), and Data Carrier Detect (pin 8).
Appendix B. Glossary

APPENDIX B: Glossary

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