iSMA-B-W0202 Modbus User Manual
version 1.2
Page 8 / 49
Connecting the communication bus
Figure 4 RS485 connection
LED Indication
Figure 5 Top panel W0202
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The power LED is ON (green) when the module is running/runs properly.
•
Communication LED is ON (orange) for 20 ms after sending each message. If the module
receives/sends a lot of messages LED can be lit continuously.
•
LEDs indicate the status of the Special Inputs are lit when resistance connected to the input is
less than 1 kΩ (Dry Contact input is active).
•
WARNING!
The LED also lights up when voltage connected to the input has a very low
potential.
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LEDs indicate the status of the Digital Outputs are lit when output is enabled.