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EM9918
  • FIGURE
  • SPECIFICATION
  • DOWNLOAD
EM9918AE 125KHZ Reader User Menu

General Features                             
. 125KHz carrier frequency                                                      
. Reading of amplitude-modulated transponders                      
. Efficient tag management                                               
. Easy to build up a control system                                          
Brief Description
. An RFID reader system
. Include A 10-cm diameter square antenna coil
. An external DC 12V voltage that provides. 0.2A current power supply is needed.
. the card with EM format is needed
Measure: 11.2*4.6*1.9cm
 
This reader is supplied in a PCB board containing RF circuits, an 8-bit microcontroller and data output connections. Its main functions are driving the antenna, sending demodulated data into microcontroller, checking the input data code and processing output data format.
The following is Data Connection of Reader: 
Number color Name Description
1 RED DC +12V DC +12V POWER
2 BLACK GND GND
3 WHITE D0 WEIGAND 26 DATA0
4 GREEN D1 WEIGAND 26 DATA1
5 YELLOW LED LED Control line, the color of the light from red to green as LED pulled down.
6 BLUE BEEP Buzzer Control line, the buzzer beep as BEEP pulled down.
7 PURPLE RS232 Rs232 data line
8 GREY No use  
The Output data format
1.Wiegand Format 26bit
Bit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Note P D D D D D D D D D D D D D D D D D D D D D D D D P
  P E E E E E E E E E E E E                          
                            O O O O O O O O O O O O P
Note: E: Summed for even parity  O: Summed for odd parity            LSB: Normal 24
P: Parity (EVEN or ODD  MSB: Normal 01   D: Data code for card: the data will use the last 24 data bits of card
SYMBOL Parameter Limits Min. Limits Max. Type UNITS
THD Hold Start data read delay time 0.5 2 0.55 mS
TDW Data Pulse width time 20 100 48 μS
TIW Data Pulse interval time 0.2 4 2 mS
TSN Data Send delay time 5 - 80 mS
TCS Hold and Start read time 40 120 100 mS
TA Total scan time 100 - - mS
 
2. RS232 interface format
This transceiver unit is designed as RS232–ready. Please follow these notes:
  • The connection of RS232 interface is ready in the PCB schematic, please refer to the instruction to connect.
  • Interface of a computer that accepts the RS232 data can use the Windows application software “Hyper Terminal” which defines the COM port and sets these data:
a. Data baud rate: 9600BPS      b. Begin bit: 0            c. Parity check: NONE
d. Data bit: 8 bits                e. Top bit: 1        f. Low control : HARDWARE.
  • RS232 interface software can transfer the 40 bits data (i.e., 64 bits excluding 9 bits header and 15 bits parity)into a 10 digits ASCII code.
  For example:
B0---,B9--,B14--,B19--,B24--,B29,--,B34--,B39--,B44--,B49--,B54--,B59-B63;111111111,10001,01001,11000,00101,10100,01100,11101,00011,10010,01010,11010.Refer the data format table:
1 1 1 1 1 1 1 1 1
ROW0=8
ROW1=4
ROW2=C
ROW3=2
ROW4=A
ROW5=6
ROW6=E
ROW7=1
ROW8=9
ROW9=6
1 0 0 0 PD0=1
0 1 0 0 PD1=1
1 1 0 0 PD2=0
0 0 1 0 PD3=1
1 0 1 0 PD4=0
0 1 1 0 PD5=0
1 1 1 0 PD6=1
0 0 0 1 PD7=1
1 0 0 1 PD8=0
0 1 0 1 PD9=0
PC1=1 PC1=1 PC2=0 PC3=1 0
From the RS232 interface in the computer will get the 11 digits ASCII code are: 38H、34H、43H 32H、41H、36H、45H、31H、39H、35H、0DH
Dimension   Reader measure: two levels 113.5mm×45.6mm(length, not including connected pin)
Cable measure:  8 pin and length is 100cm.                       

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