2019.2

and end of each unit of transferred data, as well as error detection provided by the
parity bit. The majority of serial ports use between five and eight data bits. Binary
data is typically transmitted as eight bits. Text-based data is transmitted as seven
bits or eight bits. If the data is based on the ASCII character set, a minimum of seven
bits is required. If an eighth bit is used, it must have a value of 0. If the data is based
on the extended ASCII character set, eight bits must be used.
l
Parity: Select the type of parity used for error detection. The parity transfers through
the serial connection as a single bit. It is used to verify that each set of data bits
transfers correctly. It is then stripped away before the data file passes through the
rest of the PReS Workflow process. Select None to ignore all parity bits; no error
detection occurs.
l
Stop bits: Since most serial ports operate asynchronously, the transmitted byte
must be identified by start and stop bits. The start bit indicates when the data byte is
about to begin and the stop bit(s) indicates when the data byte was transferred. The
start bit is always 0 to mark the beginning of the byte, but the stop bit can be a single
1, or two bits each with a value of 1.
l
Time-out: Set the time in seconds the PReS Workflow process waits for the transfer
of bytes in the data file before ending the transfer of this file. On a time-out, partially
received data files are not passed to the rest of the process; the Serial input resets,
ready to receive further data files.
l
Job delimiters: Enter the strings that tell PReS Workflow the data file being retrieved
through the Serial input is complete. Each line in the Job delimiters text box is a different
delimiter. You can enter as many delimiters as you want, one per line. The three default
delimiters that appear are three of the most commonly recognized end of a file delimiters.
l
Log (verbose): Select to keep a log of errors and other information related to the Serial
input. Since these messages can accumulate, you have the option of not logging them.
Telnet Input plugin preferences
The Telnet input plugin preferences control the log of the PReS Workflow Telnet Capture
service. Since PReS Workflow lets you monitor multiple Telnet inputs simultaneously, the port
setting for all Telnet input tasks cannot be set in the Preferences.
Page 828