Appendix J - Multidrop Communications; Figure A-12 Typical Multidrop Network - Microscan MS-7100 User Manual

Appendix J — Multidrop Communications
This appendix describes the rules for setting up a concentrator or controller to
communicate with a scanner in standard Multidrop protocol, as presented in
"Protocol," on page
Figure A-12 shows a typical Multidrop
network in which 1 to 50 scanners can
communicate with a host via an inter-
mediary device, a concentrator or a
controller.
Multidrop Addresses
• No two scanners in the Multidrop
Network can have the same
address.
• Each scanner in the network must
have an address (from 01 to 50)
assigned in its configuration pro-
gram.
Each address has its own separate
poll and select address (from 1C to
7F hex as shown in
page A-24).
For example, during a polling
sequence, scanner 03 expects a 20 hex ("SP" ASCII poll character) from the
concentrator. And during a select command, it looks for a select value 21 hex
("!" ASCII select character).
MS-7100/7180 Industrial Scanner User's Manual
Multidrop Communications
2-6.
Host
Concentrator
or Controller
table A-3 on

Figure A-12 Typical Multidrop Network

Polled Protocol
Multidrop ONLY
RS-485 Interface
(LAN)
Scanner 01
Scanner 02
Scanner 03
A-21