Elmes Electronic TRX Quick Start Manual

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electronic
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

Depending on type of the received data signals the repeater operates
as follows:
1. If data signal is received from Elmes dynamic hopping-code
transmitter then user programmable retransmission delay
time T (0 to 8 sec.) counting is triggered after which stored
O
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
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
to avoid serious unwanted communication problems described below:
(A) Data signal from Elmes transmitter is simultaneously received by two TRX repeaters. To avoid interference at
retransmission delay time T
(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
grammed according to the following formula:
where:
T _A, T _B - retransmission delay time of repeaters A and B,
O O
T _A, T _B - inactivity time of repeaters A and B.
N N
The T and T time intervals are as standard factory programmed to 1s and 0s respectively and do not require re-
O N
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
(0 to 8 sec.) counting is triggered. During inactivity time interval the re-
N
of the repeaters should be programmed to different values e.g. 0,8s and 1,6s.
O
T _A > T _B + 0,8s and T
N O
Wireless repeater Elmes TRX
T TRX
T
Fig.1
r
Fig.2
r
Fig.3
TRX – wireless repeater,
r – nominal operating range of wireless device
(e.g. UMB100H)
and T
O N
in both repeaters must be specifically pro-
N
_B > T _A + 0,8s
N O
Elmes Electronic 01.2005. All rights reserved..
T
R
T
TRX R
r
R
TRX TRX
r
R – receiver, T - transmitter
need to be carefully programmed
(EN)
r