EC-NPB-2X-485 Option
Updated: September 2014
05DI-HI2X485-13
Mounting
Mounting
2
•
from RS-485 “–” to Ground.
Biasing sometimes improves RS-485 communications
by eliminating “indeterminate” idle states.
In general, only
one device
on an RS-485 trunk
should be biased. Otherwise, undue loading of the
circuit may result, with fewer devices supported.
Note
RS-485 bias resistors are
different
than
“termination resistors”, externally installed at
the two physical ends of a daisychained
RS-485 trunk, across the “+” and “–”
terminals. Termination resistors are typically
100 or 120 ohm value resistors.
Whenever termination resistors are used, RS-485
biasing is typically required.
To enable biasing, install two 2-pin jumper blocks on
that port’s jumper header, as shown in
Figure 2
. To
turn off biasing,
remove
both 2-pin jumper blocks from
that port’s header ( the factory-shipped state).
Mounting
Warning
Power to the controller must be OFF when
installing or removing option cards, or
damage will occur! Also, you must be very
careful to plug any option card into its
connector properly (pins aligned).
Mount the EC-NPB-2X-485 option card in either of the
option card slots of the EC-BOS
AX
, as needed.
See
“Preparation,”
page 1 for details about RS-485
resistor biasing, available on newer option cards.
See
“COM Port Usage,”
page 3 for details about
EC-BOS
AX
COM port assignments.
Procedure 1
Mounting EC-NPB-2X-485 option card on an
EC-BOS
AX
.
1.
Remove power
from the EC-BOS
AX
—see the
previous
Warning
. Wait for all LEDs on the unit to
be Off.
Note
If accessory modules are plugged into the
EC-BOS
AX
, you may need to slide them away
from the unit to get to the cover tabs.
2.
If an EC-BOS-2/3/6
AX
series or EC-BOS
AX
Security
,
remove the battery and bracket assembly by
taking out the screws holding it in place, setting
screws aside for later. See
Figure 3
.
Figure 3
Remove screws and battery assembly.
Note
The tie wrap on the battery pack should have
its lock “knot” on
top
, as shown in
Figure 3
.
If not, cut and
remove
the tie, then
re-install
another tie wrap with its lock tab on top.
(
Tie lock at bottom interferes with option card
).
3.
Remove the blanking end plate for the slot you are
installing the option card into.
(Retain the blanking end plate in case the option
card must be removed at a later date.)
Note
Slot 2 option card installation in an
EC-BOS-7
AX
controller requires careful
attention! See the
EC-BOS-7
AX
Hardware
Installation Guide
for more details. This
document focuses on installation in an
EC-BOS-2/3/6
AX
series controller.
4.
Carefully insert the pins of the EC-NPB-2X-485
into the socket of the appropriate option card slot.
The mounting holes on the option board should
line up with the standoffs on the base board. If
they do not, the connector is not properly aligned.
Press until the option card is completely seated.
5.
Place the custom end plate that came with the
EC-NPB-2X-485 over its connector (see
Figure 4
).
Screws (4)
Option
Slot 2
Area
EC-BOS-2/3/6
AX
Blanking
End Plate
Battery
Assembly
(includes
cable and
bracket)
Unplug
battery here
Option
Slot 1
Area
Tie Wrap
Lock
(see
Note
)
