Teracom TCW242-S, Руководство пользователя

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TCW242-S_R1.0 – July 2021 Page 6
6.2.2. Digital inputs connection
All inputs are non-isolated from the power supply.
The digital inputs of TCW242-S in OPEN/CLOSED mode can be used for monitoring of devices
with “dry contact” outputs – door contact switch, push-button, PIR detector, etc.
The following picture illustrates how a dry contact switch can be connected to the input of
TCW242-S. One side of the contact is connected to “Digital In” and another side is connected to
“GND” terminals.
The digital inputs of TCW242-S in COUNTER mode can be used for monitoring devices with a “dry
contact” pulse output interface.
The maximum cable length should be up to 30 meters.
6.2.3. Analog inputs connection
All inputs are non-isolated from the power supply.
Analog inputs of TCW242-S can be used for monitoring devices with voltage and current loop
outputs. They can be connected directly to analog sensors for temperature, humidity,
current/voltage transducers, etc.
The following picture illustrates how a battery can be connected to the analog input of TCW242-
S in voltage mode. The positive terminal is connected to “Analog In” and the negative terminal to
“GND”.
The following picture illustrates how an analog sensor for temperature with current loop output
is connected to the analog input. The active terminal is connected to “Analog In” while the shield
terminal is to “GND”.