User's Manual

LF Transmitter Output
Configuration and Operation 5-7
LF Transmitter Output
The type of LF excitation signals generated by the S21 depends on the parameter settings and the
position of “System” jumpers on the LFA21 and CTL21.
For “System S21” jumpers J1 (LFA21) and J3 (CTL21) are to be set on S21 position. The LF
excitation signal generated is of type EXID. This signal is a continuous OOK signal on 125 KHz.
The modulation is a fixed repetitive frame [Excitation ID] containing the address of the reading
point. (Reader Address).
For “System 95” jumpers J1 (LFA21) and J3 (CTL21) are to be set on S95 position. The LF
excitation signal generated is of type CSAC. This is a continuous signal as defined in the Appendix
C of the 95 Series RFID Systems User’s Guide.
To check the LF signal, refer to Figure 5-3 below, and do the following:
Figure 5-3: LF Signal Measurement
1. Connect the power to the Exciter.
2. To determine the Exciter mode of operation following the field application note instructions
provided with the equipment. For additional information or questions contact Lyngsoe
Industries.
3. For checking of LF signal integrity refer to the field application notes provided with the
equipment or contact Lyngsoe Industries.
Test
J2
J5
O
L
J4
L
S21
J1
S95
1 2 3 4
GND
TAP
ANT
To LF Antenna
Terminal Block
Oscilloscope