Wireless repeater TRX_phpLultmO.pdf

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Wireless repeater Elmes TRX (EN)

This microprocessor controlled radio repeater is designed for extending operation range of low power wireless devices

and features integrated transceiver allowing reliable receiving and retransmitting of selected radio signals in com-

pliance with relevant R&TTE standards. Elmes TRX repeater identifies, stores and retransmits signals received exclu-

sively from Elmes Electronic made transmitters. With long or large communication distance to cover many repeaters

can be used in a chain or configured for simultaneous field operation. The repeater may be user set to retransmit data

messages from all or only selected Elmes devices offering configuration range and solving communication gap prob-

lems in wireless security and remote control applications.

Application examples

 Harsh radio propagation conditions or installation in base-

ments, steel and concrete constructions, metal garages limit-

ing practical operation range;

 Required distance between transmitter and receiver being

greater than useful operating range of radio equipment thus

requiring retransmitting of signals, as on fig. 1;

 Existing local object (wall, building, etc.) attenuating or reflect-

ing wireless signals requiring repeater use to extend wireless

range, as shown on fig. 2.

 Weak radio signals may not be reliably detected at large mo-

nitored area by a receiver thus requiring one or more repea-

ters to secure wide area coverage. Fig. 3 shows sample ap-

plication of repeaters allowing key-fob UMB100H hand trans-

mitters to be used in large area field.

Hint! The use of many repeaters in an installation increases the dan-

ger of radio interference and rejecting of transmitted alarm signals.

Operation

TRX R

Fig.1

r r

TRXR

Fig.2

Depending on type of the received data signals the repeater operates

as follows:

TRX TRX

1. If data signal is received from Elmes dynamic hopping-code

transmitter then user programmable retransmission delay

time T O (0 to 8 sec.) counting is triggered after which stored

data is retransmitted within 0,8 sec. The repeater then is im-

mediately ready to receive any next but different signal ex-

cluding possible retransmission of already transmitted code.

2. If data signal is received from Elmes fixed code transmitter

RP501 then after delay time interval and data retransmission,

user programmable inactivity time T N (0 to 8 sec.) counting is triggered. During inactivity time interval the re-

peater does not receive, store nor transmit any data. Proper programming of inactivity interval eliminates re-

peaters’ communication fault (B) described below.

Important! If two or more repeaters are used in a system, time intervals T O and T N need to be carefully programmed

to avoid serious unwanted communication problems described below:

r r

Fig.3

TRX – wireless repeater, R – receiver, T - transmitter

r – nominal operating range of wireless device

(e.g. UMB100H)

(A) Data signal from Elmes transmitter is simultaneously received by two TRX repeaters. To avoid interference at

retransmission delay time T O of the repeaters should be programmed to different values e.g. 0,8s and 1,6s.

(B) With two repeaters (A, B) operating in a system with Elmes fixed code RP501 transmitters , data retrans-

mission from one may be detected by other. To exclude possible continuous backwards & forwards retransmitting

of data between repeater B and repeater A the inactivity time T N in both repeaters must be specifically pro-

grammed according to the following formula:

where:

T N _A > T O _B + 0,8s and T N _B > T O _A + 0,8s

T O _A, T O _B - retransmission delay time of repeaters A and B,

T N _A, T N _B - inactivity time of repeaters A and B.

The T O and T N time intervals are as standard factory programmed to 1s and 0s respectively and do not require re-

programming if only one repeater is used in a system.

The repeater is supplied with ani-sabotage tamper switch that may activate tamper alarm channel in any Elmes

433,92MHz band receiver provided the switch is used to activate transmissions while learning the TRX to the receiver.

elmes@elmes.pl www.elmes.pl

Interfacing with Elmes wireless devices

Elmes TRX repeater recognizes all digital radio data messages received from Elmes made devices (wireless detectors

and transmitters) operating in 433,92MHz band. Described below, there are two operating modes of the repeater de-

pending on the selection made by jumper JP1 placed on board of the repeater:

J1 shorted – repeater retransmits wireless data messages received from any Elmes made transmitter – there is no

need to learn transmitters to the repeater memory prior to operation;

J1 opened – repeater exclusively retransmits wireless data messages received from transmitters learned to the repeater’s

memory prior to operation – this mode excludes retransmission of digital messages sent by Elmes made trans-

mitters that for reason of selectivity or short distance operation from receiver do not require operation range ex-

tension.

Installation

Elmes TRX wireless repeater operates indoor only and should be installed at maximum height from floor level, far from

any metal screening, mains wiring, steel reinforced concrete walls and other radio interfering devices. Standard wire

transceiver antenna should not glued to wall or any housing. External antenna may be connected to the repeater by the

use of 50 ohm coaxial cable soldered in place of the standard wire antenna with screening of the coaxial cable sol-

dered to pc board ground close to antenna output. The repeater is powered by 8…15VDC voltage connected to „+”

and „-” terminals. Terminals marked „IN” and „OUT” should be left not connected.

Repeater’s low pulsing LED indicates connected power supply while fast pulsing of the LED indicates repeater’s

transmission. The fast pulsing of the LED may be user set to off by disconnecting jumper J2 .

The installer and user of wireless products are advised to find best operating place for the transmitting and receiving

devices at installation and to regularly check operation of all wireless systems regardless of no failure indication.

PROGRAMMING PROCEDURES

1. Learning transmitter(s) to TRX memory - maximum 112:

a) Press TRX board PRG switch for less than 2 seconds – LED switches off.

b) Trigger first transmission in the transmitter to be learned – LED switches on.

c) Trigger second transmission in the transmitter to be learned – pulsing LED will confirm end of the procedure

and the transmitter is learned to the repeater memory.

2. Programming retransmission delay time T O and inactivity time T N :

( Important! For reason of precision of programmed timing T O and T N the required true values must be 8x multiplied at

programming, e.g. to program 1 second delay/inactivity interval, 8 seconds programming time must be applied)

a) Press and hold PRG switch (LED switches off) for more than 2 and less than 8 seconds. Releasing the switch

LED switches on indicating entering this programming mode,

b) Press PRG switch again – LED switches off. The delay time counting is started now.

c) After desired delay time T O has lapsed (max. 64s) press again PRG switch - LED switches on. The inactivity

time interval counting is started now.

d) After desired inactivity time T N has lapsed (max. 64s) press again PRG switch – slow pulsing LED confirms

end of procedure.

3. Deleting all transmitters from TRX memory:

Press PRG switch for more th an 8 seconds, until the LED starts flashing then release t he switch.

Slow flashing LED confirms correct programming end of the procedure. The repeater memory is erased now. Errors

or programming time out failure are indicated by fast flashing LED and TRX self setting off programming mode.

Specifications

 Superheterodyne receiver and 433,92MHz transmitter requiring 8..15VDC, 20mA power supply.

 Radio transmission (433.92 MHz, <10mW) with 200m maximal operating range in open field.

 Programmable retransmission delay time range: 0  8 seconds.

 Programmable inactivity time range: 0  8 seconds.

 Ambient operating temperature range: -20  C to +40  C.

 External dimensions (l/w/h) 58/32/19mm.

Manufacturer’s Limited Warranty. This product carries one year warranty as from the date of purchase. The warranty is limited

to the replacement of faulty original parts or repair defects of improper manufacture. Damage, misuse or improper handling by the

user or installer as well as any alterations in product’s hardware or software caused by unauthorized person violet warranty obli-

gations and all due repair costs will be charged. Elmes Electronic shall not be liable for any personal or material damage or loss

resulting from any of its products direct, indirect or partial use or failure to operate properly.

For reason of continuous product update Elmes Electronic reserves the right to change product specification without prior notice.

elmes@elmes.pl www.elmes.pl

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