IP Relay HWg-ER02b - Manual
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Configuring the control of inputs and outputs
TCP/IP mode needs to be configured and NVT (Network virtual terminal) enabled in order to work
with the digital inputs and outputs. Otherwise, the commands are not even displayed.
Digital inputs and outputs are controlled over the
Network Virtual Terminal
. This means that the I/O
control commands are embedded into the TCP/IP data stream, along the serial port data. However,
these commands only appear in the Ethernet communication, they never pass through to the serial
port.
In recent firmware versions, digital inputs and outputs can be controlled from the serial port or over
an UDP connection (see #E and #V).
NVT commands are always prefixed with a control character and have a predefined binary format.
A detailed description of the NVT protocol with examples of commands is available at our website (in
the “
Support & Download
” section).
Note:
Remember to set the desired initial value of outputs after reset.
