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Communication Values - Definitions
Baud Rate
The baud rate is the speed, measured in bits per second, at
which the printer sends or receives data. A commonly used
baud rate for RS-232 communications is 2400 bits per second.
Word Length
Word Length specifies the number of bits the printer uses to
define a character. The 9401 and 9402 printers accept a
setting of 7 or 8 bit data, but do not use the high-order bit for
data.
Stop Bits
A stop bit follows the data and parity bits to signal the end of a
character.
Parity
Parity is a means of checking the validity of data entering the
printer. The parity bit immediately follows the last data bit for a
character. The computer adjusts the parity bit according to the
parity so the data bits in the character, combined with the
parity bit, form an odd or even number of high bits.
Data Flow Control
Data flow control is the means by which the printer tells the
computer whether it is ready to accept data. DTR (Data
Terminal Ready) flow control is most commonly used with an
IBM-PC™ unless the PC has a special Xon-Xoff program.
In DTR mode, the printer activates DTR when it is ready to
accept data from the host and deactivates DTR when its
receive buffer is nearly full.
In Xon-Xoff mode, the printer sends the Xon character when it
is ready to receive data and sends the Xoff character when its
buffer is nearly full. The Xon character is 17. The Xoff
character is 19.
9401/9402 System Administrator’s Guide
7-2