Rockwell Automation 2755-SNx Adaptascan Bar Code Readers - Manual (Page 77)

4–21 Downloading Match Codes via DH485 Protocol with an SLC 5/03
t
or SLC 5/04
t
Controller
Publication 2755-6.8
This section describes how to view match codes
•
in Slave Mode via the reader’s LEDs
•
in Slave Mode via ladder logic
•
in Master Mode via ladder logic
Viewing Match Codes in Slave Mode via the Reader’s LEDs
Use a MSG Write command to download the Match Code Hex
commands. The enable bit is toggled
[F9] in order to make the
download transition. The AdaptaScan I/O LED’s will indicate a
good match or a No-Read or No-Match.
MSG
Read/Write
Read/Write:
Type:
Target Device:
Local/Remote:
Control Block:
Control Block Length:
WRITE
PEER-TO-PEER
485CIF
LOCAL
N7:200
14
Message Instruction Configuration
Parameter Configuration
Type Peer-to-Peer
Read/Write Write
Target Device 485CIF
Local/Remote Local
Control Block N7:200
Channel 0
Target Node 2
Destination File Access N7:90
Target Offset
255 (Change 255 to 256 or 100H in the third word of the
Control Block. An offset greater than 255 tells the MSG
instruction that the SLC controller is talking to a bar code
device.)
Message Length in Elements 10
Message Timeout (seconds) 10
SLC Ladder Logic