1.2. Click the "Authorization" button;
1.3 After successful authorization, close the card - issuing middleware
Step 2: Call Functions（Subject to the actual situation.）
2.1、Connect encoder
__int16 __stdcall dv_connect(__int16 beep);
Parameters
beep:[in] Value is 1, Encoder buzzer beep .
Return
Succeed then return 0.
2.2、Switch off encoder
__int16 __stdcall dv_disconnect();
Return
Succeed then return 0.
2.3、Read data
__int16 __stdcall dv_read_card(unsigned char* cardno,unsigned har* building,unsigned char* room, unsigned char* commdoors,
unsigned char* arrival, unsigned char* departure,unsigned char* cardID);
Parameters
cardno:[out] Card number returned, 6 characters.
building:[out] Building number,2 characters.
room:[out] Room number returned,4 characters.
commdoors:[out] Common doors return, Range is 00-FF.control 8 areas.(8 bit binary.)
arrival:[out]Return check-in time,Format:yyyy-MM-dd hh:mm:ss.19 characters.
departure:[out] Return check-out time,Same format with "arrival".
cardID:[out] Return UUID, 8 characters.
Return
Succeed then return 0.
2.4、Write data
__int16 __stdcall dv_write_card( unsigned char* building, unsigned char* room, unsigned char* commdoors, unsigned char* arrival,
unsigned char* departure, unsigned char* suspendnum, __int16 mode, unsigned char* cardID);
Parameters
building:[in] Building number,2 characters.
room:[in] Room number, 4 characters.
commdoors[in] ] Common doors, Range is 00-FF. Control 8 areas.(8 bit binary.)
arrival:[in] heck-in time, Format:yyyy-MM-dd hh:mm:ss.19 characters.
departure:[in] heck-out time, Same format with “arrival”.
suspendnum:[in]suspend,6 characters.
mode: [in] Type, 1 to report the loss; 0 to not report the loss.
cardID:[out] Returns UUID, 8 characters.
Return
Succeed then return 0.
2.5、Delete data
__int16 __stdcall dv_delete_card(unsigned char* room);
Parameters
room:[out] type is the guest card, then return room number.
Return
Succeed then return 0.
Error coders list
Value Description
-1 Interface error
-2 Connect encoder failed
-3 Register encoder failed
-4 Buzzer mute
-5 Not supported card type
-6 Wrong card password
-7 Wrong supplier password
-8 Wrong card type
-9 Wrong authorization code
-10 Find card request failed
-11 Find card failed
-12 Load card password failed
-13 Read device information failed
-14 Read card failed
-15 Write card failed
-16 Reauthorization required
Interface demo（test）
1. Open the obt.exe 
2. Click the "Connect" button 
3.Write card demo
a.Input the corresponding content
b.Put the guest card on the encoder，click “Write data”
4.Read card demo
Put the card on encoder，click “Read data”
5.Delete card demo
PS:When write data，the card content will be coveredPut the card on encoder，click “Delete data”