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devices. To send the commands and receive responses a connection to the device needs to be set up.
This can be done using either a TCP connection or through the COM port.
Modbus TCP Protocol: Modbus TCP is a standard communication protocol which can also be used to
read and write configuration and analogue value data. It uses binary data instead of human-readable
ASCII text, and is supported by a wide range of PLCs and data acquisition software. Unlike the ASCII
protocol, it allows overlapping requests and connections from multiple controllers.
Connecting analogue signal sources to the ED-549
These are not the only ways in which the products may usefully be connected, but the diagrams below show
the most common configurations.
Differential (balanced) voltage signal
Single-ended (unbalanced) voltage signal
Current-loop transducer signal
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