82 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
Problem Solving Using a Connected PC
You can determine radio status with a PC connected to the master sta-
tion. Useful commands for performing diagnostics are listed in Table 8
on Page 35. For instructions on performing diagnostics using a con-
nected PC, see “Performing Network-Wide Radio Diagnostics” on Page
84.
Problem Solving Using the Front Panel Display
The radio includes several useful tools in the
Diagnostics and Event Log
menus that you can use to identify system problems. Brief descriptions
of Event Log commands are given below. Other commands useful for
performing diagnostics are listed in Table 16 on Page 67. Refer to Sec-
tion 6.5, Screen Descriptions, for detailed information about these com-
mands.
Event Log Use the Event Log to identify system problems. The radio stores recent
events, such as turning the primary power on, in a log that you can
review using the
Event Log screen (for a full description, see “Event Log”
on Page 79). In many cases, you can review the events leading up to a
failure to determine the cause of a problem. Event log messages are also
helpful when calling GE MDS for technical assistance.
Table 20. Explanation of Chassis-Mounted LEDs
LED Name Meaning When Lit
PWR Power is applied to the radio.
MJR ALM Major Alarm—Indicates a hardware failure or other abnormal
condition that prevents (or seriously hampers) further operation of
the radio. Factory service might be required.
MNR ALM Minor Alarm—Indicates a condition which, under most
circumstances, will not prevent radio operation. This includes
out-of-tolerance conditions, baud rate mismatches, and so on.
Investigate the cause to prevent system failure.
RTS Request to Send—A logic high is present on Pin 4 of the DATA
INTERFACE connector. The transmitter is keyed.
CTS Clear-to-Send—The programmed CTS delay time has elapsed
and a logic high is present on Pin 5 of the DATA INTERFACE
connector.
TXD Transmit Data—The radio is receiving data at Pin 2 of the DATA
INTERFACE connector.
DCD Data Carrier Detect—The radio is receiving valid data frames from
another station (over the air). Pin 8 of the DATA INTERFACE
connector is at a logic high.
RXD Receive Data—The radio is outputting data at Pin 3 of the DATA
INTERFACE connector.
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