TCG140_R1.1 – May 2018
Page 10
“Star” topology can be used only as a last resort for up to 4 sensors and total cable length up to
10 meters.
There are many parameters which determine the maximum length of the wires - type of cable,
the number of sensors, ambient electromagnetic noise and sensor network topology.
It is strongly recommended to use only UTP/FTP cables and keep total cable length up to 30 m.
Although functionality has been achieved in а longer distance, we cannot guarantee error-free
operation over mentioned wiring length.
We guarantee proper operation only with Teracom 1-Wire sensors.
5.2.7.
Relays connection
The relay contacts are internally connected directly to the terminal connectors. For all relays
normally open, normally closed and common contacts are available. For loads with higher
switchable current/voltage than specified, an external relay should be used.
When mechanical relays switch inductive loads such as motors, transformers, relays, etc., the
current will arc across the relay contacts each time the contacts open. Over time, this cause
wears on the relay contacts which shorten their life. When switching an inductive load, it is
recommended that relay contact protection devices are used.
6.
LED indicators
LED indicators show the status of the controller:
REL1 - REL4
(green) – the LED is ON when the corresponding relay is activated (the NO
contact is connected to COM);
SIG
(red) – indicates the status of the device together with STA
STA
(yellow) – indicates the status of the device together with SIG.
The following states are displayed:
Controller initialization
– after power-on and firmware update SIG and STA turn ON for a
second, after this turn OFF for another second.
Searching for GSM network
– after initialization, SIG is OFF, STA flashes (flash length –
200ms)
Summary of Contents for TCG140
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