Emsa HS500E manual Error Codes, Error Types, Y n t a x Error s, F R e s p o n s e Error s

C H A P T E R 4 : E R R O R C O D E S

CHAPTER 4:

ERROR CODES

The HS500E will generate an error response if it is unable to complete an operation. When an error occurs, the LSB of the second word in a response (the Command Echo word) will be replaced by a 1-byte error code that indicates the actual error that was experienced.

4.1ERROR TYPES

There are basically two types of errors that can occur.

S Y N T A X E R R O R S

The majority of errors that occur do so because of improperly formatted commands. Syntax errors include everything from entering an invalid command ID to attempting to read from or write to an address not within the range of the tag’s memory limits.

R F R E S P O N S E E R R O R S

This type of error can occur if the distance from the tag to the antenna exceeds the RF range or when a command is not completed before the Timeout Value expires.

4 . 1 . 1 S y n t a x E r r o r s

O V E R A L L L E N G T H E R R O R S

0x89: User sends a command with an overall length value of less than 6 bytes. User miscalculates overall length when executing a Write command.

L E N G T H L I M I T S

0x8D: Limits or boundaries concerning a Read/Write/Fill Length field were not satisfied.

0x8F: Tag starting address and length conflict with one another. This can occur if, for example, the user decides to read data near the end of the tag and specifies a length that exceeds the remainder of the tag memory.

W R I T E L E N G T H L I M I T

0x99: User attempts to write to the tag but does not provide the exact number of bytes specified in the Write Length field.

4 . 1 . 2 R F R e s p o n s e E r r o r s

T I M E O U T F A I L C O D E

0x9F: Timeout Value has been exceeded. User needs to set a longer Timeout Value.

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