Page 22 Operation 90030500B
Interpreting the LED Indicators
The LED indicators are used to display two different types of status information. If the
alphanumeric display shows a port number, the LED indicators display serial port sta-
tus information and the labels
above
the LEDs apply. If the alphanumeric display
shows
EA
, the LED indicators display Ethernet activity and the labels
below
the LEDs
apply. If the alphanumeric display shows
AC
or
PU
, the LED indicators do not dis-
play data.
Serial port status
You can display the status of a serial port by pressing either of the pushbuttons until
the port number appears on the alphanumeric display. The LED indicators then pro-
vide RS-232 line status information (in a similar way to a breakout box) and flow con-
trol information, as follows:
Signal CCITT Description
TD 103 Transmitted Data
RD 104 Received Data
RTS 105 Request to Send
CTS 106 Clear to Send
DSR 107 Data Set Ready
DCD 109 Data Carrier Detect
DTR 108 Data Terminal Ready
RI 125 Ring Indicator
OFC - Output is Flow Controlled
IFC - Input is Flow Controlled
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