Commissioning and Diagnostics
6-20
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
1SI 3964/ASCII, 1SI Modbus/USS Serial Interface Modules
SF
TX RX
LEDs
SF TX
Meaning What to Do
Hardware fault
Firmware error
Parameter assignment
error
Wire break or loose
cable between the mo-
dule and the communi-
cation partner
1
Communication error
Check the module
Check the parameteriza-
tion. Evaluate the diagno-
sis.
Check the wiring.
Check the communication
settings.
On
On
The module is sending
data via the interface.
The module is receiving
data via the interface.
Status indicator
Group
error (red)
RX
On
1
Only detected in the case of RS-422 interface connections when the
default for the receive line is set to R(A) 5V/R(B) 0V.
Figure 6-16 LEDs on the 1SI 3964/ASCII, 1SI Modbus/USS
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