ACS ACR1281U-C8, Руководство по программированию

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ACR1281U-C8 – Application Programming Interface
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5.8. ACR120_Dec
Decrements a value block by subtracting a value stored.
High Level API :
DLLAPI INT16 AC_DECL
ACR120_Dec ( INT16 hReader,
UINT8 Block,
INT32 Value,
INT32* pNewValue);
Parameters Description
hReader Handle to the reader returned by AC_Open()
Block Block number
Value Value subtracts
pNewValue Updated value after decrement
Return Value INT16 Result code. 0 means success.
Table 27 : ACR120_Dec Command Description
Low Level Frame Structure:
Command: From PC to Reader (10 bytes)
Command Code
(1 byte)
Command Data Length
(1 byte)
Instruction Code
(1 byte)
Data Length
(1 byte)
Data
(1 byte) (4 bytes)
E0h 07h 10h 05h Block Value
Response: From Reader to PC (9 bytes) <<Success >>
Response Code
(1 byte)
Response Status
(2 bytes)
Response Data Length
(2 bytes)
Response Data
(4 bytes)
E1h INT16 (>=0) 0004h pNewValue
Or
Response: From Reader to PC (5 bytes) << Fail>>
Response Code
(1 byte)
Response Status
(2 bytes)
Response Data Length
(2 byes)
E1h INT16 (<0) 0000h