Rockwell Automation 2755-SNx Adaptascan Bar Code Readers - Manual (Page 59)

4–3 Downloading Match Codes via DH485 Protocol with an SLC 5/03
t
or SLC 5/04
t
Controller
Publication 2755-6.8
Important: When setting up a DH-485 network using an
AdaptaScan, make sure that the nodes on the network
are in sequential order. The SLC 5/03 or 5/04 should be
Node 1, and AdaptaScan should be Node 2, and each
node after that should be 3, 4, and so forth. If other
DH-485 nodes are needed (i.e. DTAM, etc...), the
AdaptaScan node number(s) must be first. Node gaps
must be avoided in order to prevent the AdaptaScan
from Soliciting of Successor (SOS). By preventing
SOS, bar code throughput is maximized as it is sent to
the SLC. In other words, when setting up the
AdaptaScan via DH-485 the first priority is to process
bar code data instead of finding node gaps.
Connecting Readers to SLC 5/03 Controller
You must use a link coupler if the distance between the reader and
the SLC is greater than 15.2 meters (50 feet). The reader can
connect directly to another RS-485/RS-422 device. Point-to-point
and network connections are the same.
The end devices on the DH-485 network must be terminated. The
wiring base of the AdaptaScan Reader provides a termination switch.
Termination Switch
Ground
Shield
RS-485/422
RS-485/422
RS-422
RS-422
Term
A
B
Com
Shield
Chassis Gnd
SLC 5/03 Processor
Computer
1747-PIC
1747-AIC Module
2755-ASN AdaptaScan Software
SLC 500 Advanced Programming Software
AdaptaScan Wiring Base
RS-422/RS-485 Terminal
Power
Supply