Figure 6-1 Loop-Back Connector For Serial Port Test (Wire-Side View) - Siemens SIMATIC TI505 386/ATM User Manual

6.1 Diagnostics
Power-up and
Run-time
Diagnostics
User-Initiated
Diagnostic Tests
6-2 Troubleshooting
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The 386/ATM has an extensive set of ROM-resident hardware diagnostics.
Following power-up or a manual reset (using the reset button), the 386/ATM
automatically initiates a set of internal diagnostics to verify system memory,
CPU, and functionality.
During operation, the 386/ATM generates and tests parity for each access to
system DRAM to ensure integrity of the system DRAM memory.
You can initiate diagnostic testing at any time. Initiating diagnostic testing
halts the current operation. To begin, press:
Use the arrow keys to highlight
prompts you with information on selecting the diagnostic tests available.
The 386/ATM reboots after exiting the diagnostic menu.
NOTE: The Floppy Disk diagnostic requires a "scratch" 3.5" high-density
diskette (1.44M byte). All data on this diskette will be lost during the
Floppy Drive test. The diskette will have to be reformatted before it can be
used for MS-DOS applications.
NOTE: The Fixed Disk test is non-destructive; no data on the fixed disk will
be lost as a result of the test.
To run the External Loop-back test on the serial ports, you must attach a
loop-back connector to the serial port. Figure 6-1 shows the wiring diagram
for the loop-back connector.

Figure 6-1 Loop-back Connector for Serial Port Test (Wire-side View)

CNTL ALT
and press
DIAGNOSTICS
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386/ATM Coprocessor User Manual
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. The system
Enter
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