8
8903/RS RS485 Communications Interface
Status and Activity LED Indications
Table 1: RS485 Status LED
Status LED
State
Description
Off -
-
No power
Orange Initialising
-
RS485 initialising
Red / Green
50% flash
Configuring
-
Configuring
-
Invalid DSE configuration
Green
Process
Active
-
A frame addressed to this node has
been received within the timeout period
-
The process active timeout is disabled
and the first frame addressed to this
node has been received
Green
50% flash
Process Not
Active
-
Process not active
Table 2: RS485 Activity LED
ERROR LED
Description
Off
-
No power
-
Not receiving frames addressed to this node
-
Not transmitting frames from this node
Orange
-
RS485 initialising
Green
Flickering
-
Receiving frames addressed to this node
-
Transmitting frames from this node
Red
Flickering
-
Receiving frames addressed to this node with errors
detected
-
Transmitting an exception code from the node
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