Appendix M Multidrop Communications - Microscan MS-9 User Manual

Multidrop Communications
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
2. Select Multidrop
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
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-33.
A-32
MS-9 Scanner User's Manual
in the Protocol configu-
.
Save to Reader
Host
Concentrator
Retrieve Scanner
01 to 50.
and
Send and
Polled Protocol
Multidrop ONLY
RS-485 Interface
Scanner 01
Scanner 02
Scanner 03
Settings.
Save.