Quectel GV100, Руководство пользователя

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GV100 User manual
3.4.5. Digital Output
The outputs are Open-Drain type with no internal pull-up resistor which also be used to
control a relay. It means that the user has to provide a pull-up resistor or a relay coil to any
positive voltage (32V max.) to detect an inactive output by voltage. Each output can drive a
continuous current of 0.2A.
The electrical conditions are:
Logical State Electrical State
Active <1.5V, max current is 0.2A
Inactive Open or the pull-up voltage
(max 32V)
The outputs are used for cutting/restoring GND. The example connections are:
The example connection to drive a LED
The example connection to drive a Relay
If the digital output is used to drive a relay, a catch diode is showed across the relay coil, this
is necessary to prevent damage to the digital output when the relay is turned off. Many
modern relays come with this diode pre-installed internal to the relay itself. If the relay has
this diode, insure the proper relay polarity connected is used. If this diode is not internal, it
should be added externally. A common diode such as a 1N4004 will work in most
circumstances.
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