Specifications

78 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. E
Problem Solving Using a Connected PC
Determination of radio status may be performed with a PC connected to
the master station. Useful commands for performing diagnostics are
listed in Table 7 on Page 33. For instructions on performing diagnostics
using a connected PC, see “Performing Network-Wide Radio Diagnos-
tics” on Page 80.
Problem Solving Using the Front Panel Display
The radio includes several useful tools in the
Diagnostics and Event Log
menus that can be used to identify system problems. Brief descriptions
of Event Log commands are given below. Other commands useful for
performing diagnostics are listed in Table 15 on Page 63. Refer to Sec-
tion 6.5, Screen Descriptions, for detailed information about these com-
mands.
Event Log The Event Log is a helpful way to identify system problems. The radio
stores recent events, such as turning the primary power on, in a log that
can be reviewed using the
Event Log screen (for a full description, see
“Event Log” on Page 75). In many cases, the events leading up to a
failure can be reviewed to help determine the cause of a problem. Event
log messages are also helpful when calling MDS for technical assis-
tance.
Table 19. 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 will prevent (or seriously hamper) further operation
of the radio. Factory service may 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, etc. The cause
should be investigated 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—Data is being received 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.