Appendix L Multidrop Communications - Microscan MS-860 User Manual

Multidrop Communications
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,
Multidrop in the Protocol configuration menu.
2. Select
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
8. Right-click in the window and select
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.
"Connect to Reader via the Concentrator"
10. Next, go to
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Host
Concentrator
Retrieve Reader Settings.
01 to 50.
Save to Reader and Send and
on the next page.
MS-860 Industrial Raster Reader User's Manual
Polled Protocol
Multidrop ONLY
RS-485 Interface
Reader 01
Reader 02
Reader 03
Save.