BAPI Wireless 900 MHz Installation And Operating Instructions

Installation and Operating Instructions 

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17614_ins_wireless_900_rcvr 

Specifications subject to change without notice. 

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

Tel. +1-608-735-4800

Fax +1-608-735-4804

E-mail:sales@bapihvac.com

Web:www.bapihvac.com 

Page 1 of 4 

Rev 05/07/2007

The BAPI 900 MHz unit receives a repeated or retransmitted RF signal from one or more wireless temperature or 

humidity transmitters. The transmitter signal (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 900 MHz Receiver then outputs the values to any Analog Output Module through an RS485 four-wire bus. The 

output module converts the signal to an analog voltage, current or resistance for the controller. The 900 MHz 

Receiver can accommodate up to 127 different output modules. The receiver is surface, snaptrack or din rail 

mountable with an attached antenna or a 79” extendable antenna. 

 900 MHz Receiver 

 900 MHz Receiver Front View  

#2 Philips Screwdriver, Drill, Wire 

1.  Apply power to the receiver, repeater and output modules. (Note: Apply loop power to the current output module.) 

2.  The power LED on the Receiver should light and remain lit.  The powered analog output module's LED should 

flash and go out.  (The flash is very quick.) 

5.  Remove the cover of the transmitter and install the batteries, observe polarity.  The small LED at the bottom right, 

next to the Transmitter Training Button, should flash approximately once every 10 seconds.  (The flash is very 

quick.) 

6.  Pick a transmitter and an analog output module you want to train to recognize one another. Press and hold the 

plastic service button on the top of the Output Module, at the same time press for one second and release the 

button on the transmitter.  When the LED on the output module lights, release its button (The LED will go out 

when you release the button).  The output module will now report the environmental conditions from the 

transmitter trained to it.  The output module's LED will quickly flash whenever it receives an update from the 

transmitter. 

7.  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. 

8.  Replace the transmitter's cover and back out the security screws.  

Input Power

Power to Analog 

Output Modules 

Analog Output 

Modules 

Communications

May be ordered with a 

dipole antenna on a 79" wire, 

not shown