Rockwell Automation 2755-SNx Adaptascan Bar Code Readers - Manual (Page 194)

10–32 Communicating with an SLC 5/03 Processor on a DeviceNet Network using Explicit Messaging
Publication 2755-6.8
Notes on using Explicit Messaging
•
You can send messages sequentially from the SLC 5/03 to
different bar code readers, but the response will not update
properly (when the response is read in N25:0).
•
The TXID byte does not need to be incremented, although you
may not know where the response came from.
•
To receive the correct response from the command sent from the
SLC 5/03 you must:
1. Send command down, matchcode download (TXID=11).
2. Send a 03 in the status command. Refer to page 10–26 for
more information.
3. Increment TXID to 12.
4. Send command down, turn on LED 1 (TXID=12).
5. View N25:0 for response to step 4.
6. Confirm that TXID=12. If your response is 90, the command
was sent correctly. If you receive a 94, the was not sent
correctly.
•
If an incorrectly formatted command is sent from the SLC 5/03,
you must send a 03 in the status command byte in order for the
system to operate properly.
•
When sending a 03 in the status command byte, the SDN card
will produce an error until the next command is sent.