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-BOSAX, 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-BOSAX COM port assignments.
Procedure 1 Mounting EC-NPB-2X-485 option card on an
EC-BOSAX.
1.
Remove power from the EC-BOSAX—see the
previous Warning. Wait for all LEDs on the unit to
be Off.
Note If accessory modules are plugged into the
EC-BOSAX, you may need to slide them away
from the unit to get to the cover tabs.
2.
If an EC-BOS-2/3/6AX series or EC-BOSAXSecurity,
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-7AX controller requires careful
attention! See the EC-BOS-7AX Hardware
Installation Guide for more details. This
document focuses on installation in an
EC-BOS-2/3/6AX 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-2/3/6AX
Blanking
End Plate
Battery
Assembly
(includes
cable and
bracket)
Unplug
battery here
Option Slot 1 Area
Tie Wrap
Lock
(see Note)
