Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 45)

Chapter 4
Configuring Your Decoder
4–18
LABEL DELIMITER (i) - You can enter one of two options:
1) The label delimiter characters being used. These characters indicate the
beginning and end of bar code label information. Refer to Table 6.A for a
more detailed description. Refer to Figure 6.5, items #4,#12, and #13. The
host can use this character as a marker between fields to sort out the data.
2) 255 = None.
START CHAR (j) - You can enter one of two options:
1) The start character you want to specify. Refer to Figure 6.5, item #1.
2) 255 = None.
END MESSAGE (k) - Refer to Figure 6.5, item #15. You can select one of
five options:
1) CRLF. Selecting CRLF will send the ASCII control codes CRLF at the
end of the transmission.
2) CR. Selecting CR will send the ASCII control code CR at the end of the
transmission.
3) LF. Selecting LF will send the ASCII control code LF at the end of the
transmission.
4) ETX. Selecting ETX will send the ASCII control code ETX at the end of
the transmission.
5) None.
TRANSMISSION CHECK (l) - When enabled, the transmission check
characters follow the end of message character(s). Refer to Figure 6.5, item
#16. You can select one of four options:
1) LRC (Longitudinal Redundancy Check). Selecting 8-BIT LRC will cause
the decoder to verify transmissions using the Longitudinal Redundancy
Check method (exclusive OR of all bytes in the message).
2) Checksum-LSB (Least Significant Byte). Selecting LSB SUM-16 will
cause the decoder to verify transmissions using the checksum method (sum
of all message bytes) with the least significant byte transmitted first.
3) Checksum-MSB (Most Significant Byte). Selecting MSB SUM-16 will
cause the decoder to verify transmissions using the checksum method (sum
of all message bytes) with the most significant byte transmitted first.
4) None.
Note: If you select one of the transmission check options, do not use
XON/XOFF flow control. There is the possibility of the transmission check
bytes being interpreted as an XOFF character.