BAPI 900 Installation & Operation Manual

Installation and Operating Instructions

17614_ins_wireless_900_rcvr

Overview and Identication

The BAPI 900 MHz unit receives a repeated or re-transmitted RF signal from one
or more wireless temperature or humidity transmitters. The signal from the transmitter
(418 MHz) is received by a BAPI Repeater and then re-transmitted at 900 MHz up to
1,000 feet to the 900 MHz Receiver.

The receiver then outputs the values to any Analog Output Module through an RS485
four-wire bus. The Analog Output Modules convert the signal to an analog voltage,
current or resistance for the controller. The receiver can accommodate up to 127
different Analog Output Modules. It is surface, snaptrack or DIN rail mountable with a
79” extendable antenna for optimum recep­tion.

Note: The 900 MHz Receiver will only
receive a signal from a Repeater. It will not
receive the signal from the transmitters,
which transmit at 418 MHz.

Fig. 1: Two views of the 900

MHz Receiver.

Customer Provided Tools and Materials

#2 Philips Screwdriver, Drill, Wire

Wireless 900 MHz Receiver

rev. 04/21/15

Analog Output Module Training

The installation process requires that each transmitter is trained to
its associated output module or modules so that they receive com­munications from the correct transmitter. Pushing buttons in a de-

Battery polarity
important or damage
to the unit may occur

ned sequence on the transmitter and output module will bind the
two units together. The training process is easiest on a test bench
so that the transmitter and receiver/output modules are within
arm’s reach of each other. Training can be done in the eld but will
require two people and a set of walkie talkies or cell phones. Be
sure to place a unique identication mark on the transmitter and
associated output module or modules after they have been trained
so that they can be matched together at the job site.

If more than one variable is transmitted by the room transmitter
(temperature, humidity and setpoint for instance), each variable
requires a separate output module. Perform the training sequence
for each output module. Any transmitted variable can be trained to
more than one output module.

TEMPERATURE OR HUMIDITY VARIABLE TRAINING

1. To train an output module to a Temperature or Humidity
variable, select the Resistance, Voltage or Current Output Module calibrated to the
temperature or humidity range you need and connect it to the wireless receiver. Note:
Multiple output modules can be trained to the same transmitter variable if desired.

2. Apply power to the receiver which will supply power to the connected output modules.
The power LED on the receiver will light and remain lit. (Current Output Modules
must have loop power supplied to the module itself before they can be trained.)

3. Remove the cover of the room transmitter and remove the battery tabs or install the
batteries, observing polarity as shown in Fig 2. The small LED at the bottom right of
the circuit board, next to the setpoint, will ash approximately once every 20 seconds,
indicating a transmission. (The ash is very quick.)

Training

Button

Override

Button

Setpoint

Slider

Fig. 2: Room Transmitter with

Optional Setpoint and
Override.

Service Button

Transmit

LED

Continued on next page....

Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA

Tel:[phone] • Fax[phone] • E-mail:[e-mail] • Web:www.bapihvac.com

Specications subject to change without notice.

Fig. 3: Output Module

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Wireless 900 MHz Receiver

Installation and Operating Instructions

17614_ins_wireless_900_rcvr

Analog Output Module Training continued...

4. Press and hold down the “Service Button” on the top of the output module (Fig 3) that you wish to train. Then, press
and release the “training button” (see Fig 2) on the room transmitter. When the output module receives the “training
transmission” from the room transmitter, the output module’s red LED will light. Release the “Service Button” on the
output module and the red LED will go out. The transmitter and output module are now trained to each other. During
normal operation, the output module’s LED will ash about once every 20 seconds indicating data reception from the
transmitter trained to it.

Note: The room transmitter sends both the temperature and humidity information when the “Training Button” is

pressed. However, each Analog Output Module is congured at the time of order as a temperature, humidity,
Setpoint or Override module and will only recognize the relevant information and will ignore the rest.

5. Mount the transmitter at the desired location. If needed, remove the batteries to do so. The units will remain trained
to one another through power failures and battery replacement. Replace the transmitter’s cover and back out the
security screws.

SETPOINT VARIABLE TRAINING

1. To train an output module to a Setpoint variable, select the Setpoint Output Module (SOM) calibrated to the setpoint
range you need and connect it to the wireless receiver. Note: Multiple output modules can be trained to the same
transmitter variable if desired.

2. Apply power to the receiver which will supply power to the connected output modules. The power LED on the
Receiver will light and remain lit. (Setpoint Output Modules with current output must have loop power supplied

to the module itself before they can be trained.)

3. Remove the cover of the room transmitter and remove the battery tabs or install the batteries, observing polarity as
shown in Fig 2. The small LED at the bottom right of the circuit board, next to the setpoint, will ash approximately
once every 20 seconds, indicating a transmission. (The ash is very quick.)

4. Press and hold down the “Service Button” on the top of the output module (Fig 3). Then, press and release the
OVERRIDE button on the transmitter (See Fig 2). (Note: If the unit was not ordered with an override function, then
the OVERRIDE button will be shorter and will not extend outside the case but will still be accessible upon removing
the cover.) When the output module receives the “Training Setpoint” info from the transmitter, the output module’s red
LED will light. Release the “Service Button” on the output module and the red LED will go out. The transmitter and
output module are now trained to each other. During normal operation, the output module’s LED will ash about once
every 20 seconds indicating data reception from the transmitter trained to it.

5. Mount the transmitter at the desired location. If needed, remove the batteries to do so. The units will remain trained
to one another through power failures and battery replacement. Replace the transmitter’s cover and back out the
security screws

rev. 04/21/15

Mounting and Locating of the 900 MHz Antenna

The 900 MHZ Receiver comes with the “Whip” Antenna but a
900 MHz Extendable Dipole Antenna is also available.

The receiver may be located inside a metal enclosure but the
antenna must be outside the enclosure. The “Whip” Antenna
simply screws onto the receiver. Mounting the receiver and
antenna on a metal surface may block reception from behind the
surface and frosted windows may block reception too.

For the Extentable Dipole Antenna, peal off the protective
lm from the adhesive pad and stick the antenna to a wall or
other non-metallic support. Mounting the antenna on a metal
surface may block reception from behind the surface and
frosted windows may block reception too. A wooden or plastic
furring strip attached to a ceiling beam makes a great mount.
The antenna may be hung from any ceiling xture using ber or
plastic twine. Do not use wire to hang, and do not use perforated
metal strapping, commonly called plumbers tape.

Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA

Tel:[phone] • Fax[phone] • E-mail:[e-mail] • Web:www.bapihvac.com

Fig. 4:

900 MHz “Whip”

Antenna (left) and the

900 MHz Extendable

Dipole Antenna with

79” Cord

Specications subject to change without notice.

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