Multidrop Communications
A-26
MS-860 Industrial Raster Reader User’s Manual
Appendix L — Multidrop Communications
This appendix describes the rules for setting
up a concentrator or controller to communi-
cate with a reader in standard Multidrop pro-
tocol.
The diagram to the right shows a typical Mul-
tidrop network in which 1 to 50 readers can
communicate with a host via an intermediary
device, a concentrator or a controller.
Configure Your Reader for Multidrop
1. With the reader connected to the host,
Retrieve Reader Settings
.
2. Select
Multidrop
in the
Protocol configuration menu.
You will see the following message:
Important:
You must change your preamble and postamble characters so that
they are not CR or NULL.
This allows data to move through the concentrator without interference.
3. Click
OK
.
4. Next, go to
Preamble Characters (still in the Protocol menu) and double-click
on
Characters
.
5. This will open up an ASCII character table. Select any character other than
CR
.
For example, select
LF
.
6. Repeat the above for
Postamble
.
7. Check the multidrop address. Enter a number from
01
to
50
.
8. Right-click in the window and select
Save to Reader
and
Send and Save
.
9. Your reader is now in multidrop. From here on, you will need to use the concentra-
tor to relay commands and data between the reader or readers and the host.
10. Next, go to
"Connect to Reader via the Concentrator"
on the next page.
Reader 01
Reader 02
Reader 03
Host
Concentrator
Multidrop ONLY
RS-485 Interface
Polled Protocol
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
