Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 47)

Chapter 4
Configuring Your Decoder
4–20
CODABAR CHECK CHAR (s)- Selecting YES for this field will enable
the decoder to compute and verify a code check character for Codabar bar
codes. The code check character ensures that the data is read correctly. If
NO is selected, the decoder will assume that a check character does not exist.
Refer to Figure 6.5, item #9.
Note: The Codabar check character is computed as a Modulus 16 sum of all
character values as specified in AIM specification USS-Codabar.
SEND CODABAR CHECK CHARACTER (t) - Selecting YES for this
field will enable the decoder to transmit the code check character with the
bar code data. A code check character will not be sent if NO is selected.
Refer to Figure 6.5, item #9.
Host Communications
Note: Unlike the other decoder operating parameters, changes to the
following parameters will not take effect until you SAVE the changes, and
then restart the decoder: HOST PROTOCOL, DEVICE ADDRESS, ACK
and NAK CHARACTERS, BAUD RATE, NUMBER OF DATA & STOP
BITS, PARITY.
BAUD RATE (u) - This field sets the baud rate at the HOST port connector.
You can select one of seven baud rates:
1) 300
2) 1200
3) 2400
4) 4800
5) 9600
6) 19200
7) 38400
BITS/CHAR (v) - This field sets the number of data and stop bits sent with
each character. You can select one of the following:
8 Data, 1 Stop
8 Data, 2 Stop
7 Data, 1 Stop
7 Data, 2 Stop
PARITY (w) - This field defines the parity bit for each character transmitted
or received at the host port. You can select None, Odd, or Even parity.
ACK CHAR (x) - This field sets the Positive Acknowledgment character
used in ACK/NAK protocol. The ACK character is sent by the host to
acknowledge receipt of a message. You have one of two options: