Microscan MS-710, User Manual

Page: 169 / 186

Appendices
MS-710 Scanner User’s Manual
A-29
Appendix
Appendix M — Multidrop Communications
This appendix describes the rules for setting
up a concentrator or controller to communi-
cate with a scanner in standard Multidrop pro-
tocol.
The diagram to the right shows a typical Mul-
tidrop network in which 1 to 50 scanners can
communicate with a host via an intermediary
device, a concentrator or a controller.
Configure the Scanner for
Multidrop
1. With the scanner connected to the host, do Retrieve Scanner Settings .
2. Select Multidrop in the Protocol configu-
ration menu.
You will see the following message:
Important.
You must change your pream-
ble and postamble characters so that they
are not CR or NULL
.
This allows data to move through the con-
centrator 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 Scanner and Send and Save .
9. Your scanner is now in multidrop. From here on, you will need to use the concen-
trator to relay commands and data between the scanner or scanners and the host.
10. Next, go to “Connect to Scanner via the Concentrator” on page A-30.
Scanner 01
Scanner 02
Scanner 03
Host
Concentrator
Multidrop ONLY
RS-485 Interface
Polled Protocol