Rs-485 Configuration Via Unit's Primary - Honeywell MPA2 Installation Manual

Installing the MPA2 Panels
Installation
DIP switch S1 positions 7and 8 are provided for supplying biasing and
end-of-line termination for the RS-485 network. The board ships with the
switches active. For a Multidrop RS-485 Line, you must turn ON both
switch positions 7and 8 of S1. (terminated and biased) at the two
end-point panels. At all other panels, set DIP switches 7 and 8 in the OFF
position. Both switches on a given panel must be set the same. Note that
biasing and termination on both ends are present. Use the S1 positions
7and 8 ON on both ends of the RS-485 network.
For more information on end of line (EOL) termination, contact
Note:
Honeywell technical support.
If an RS-485 network has a MPA2 Secondary panel, no N1000-II,
Note:
N1000-III, N1000-IV, or NS2 are allowed on the same network. If they are
added to a network with a MPA2 Primary panel, they will not be able to
communicate with the host computer.
Figure 11: RS-485 Configuration via MPA2 Primary
NetAXS-4
Panel
44 www.honeywell.com
Ethernet
Terminal
RS-485 Multidrop Line
Reader 1
. .
.
NetAXS-123
Panel
Reader 4
MPA2
Primary
RS485
Downstream
Bus
Door 1
. .
.
MPA2
Door 3
Reader 1
. .
.
Reader 4
Door 1
. .
.
Door 2