Gtco 2500 Series - Users Guide 2/3 Manuel d'utilisateur télécharger pdf (Page 17)

2500 Series 17

Switch 7: Spare

Switch 8 Spare

BANK 2: Model ID

BANK 3: Software ID

BANK 4: Analog to Digital Converter

BANK 5: Input

BANK 6: Grid Test

BANK 7: Checksum

BANK 8: Transducer Data

Test Descriptions

RUNTIME OR SELF-TESTS

RS-232 PINOUT

NON-VOLATILE MEMORY

CHECKSUM

ROM CHECKSUM

RAM READ/WRITE

This is NOT a failure indicator. Indicator lights #2 and #3

correspond to pins #2 and #3 of the RS-232 connector.

The indicator lights if -12 V is present on the pin.

All bytes of the non-volatile memory are added and

compared to a Checksum. If they are not equal, the test is

failed. Each time the memory is altered; a new Checksum

is calculated and stored.

The bytes of the ROM are exclusive-ORed. The test fails if

the ending value is non-zero.

The RAM is written with a checkerboard pattern, read and

compared with write data. The test fails if the two do not

match. Data needed by the system is moved so the entire

RAM may be checked without destroying its contents.

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Gtco 2500 Series - Users Guide 2/3 Manuel d'utilisateur Page 17