Appendix N Multidrop Communications - Microscan MS-3 User Manual

Appendix N — 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 Your Scanner for Multidrop
1. With the scanner connected to the host, do
Step 7 —"Retrieve Scanner Settings" on page
2. Select Multidrop
ration 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 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
8. Right-click in the window and select
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-52.
in the Protocol configu-
Save to Scanner
Chapter Appendices
Host
Concentrator
Retrieve Scanner Settings
1-11.
01 to 50.
and Send and
MS-3 Laser Scanner User's Manual
Polled Protocol
Multidrop ONLY
RS-485 Interface
Scanner 01
Scanner 02
Scanner 03
as in
Save.
A-33