Introduction
English, Revision 02, Date: 12.07.2011
4
1
Introduction
The herein described system is especially suited for indoor areas. The electronic units
are not sealed within the antenna cases, but varnished. Therefore it is possible to ef-
fect all important settings and adjustable values after manufacturing. This leads to fair
priced systems. Software updates can be effected using a serial interface.
The interpreter
G_71912-A
supplies the transponder code as a serial signal or parallel
signal as well as a midpoint crossover pulse when crossing over a transponder, which
is reproducible very exactly.
The transponders used in this system are trovan™ transponder ID200 (read only) and
ID250 (read / write). These transponders are fair priced and especially suited for the
applications of this system (track guided or rail-mounted vehicles with fairly small
reading distances). This manual refers to equipment with software version 1.08.
1.1
System Components
The following components which all match the evaluation unit (see n
o
. 3) are offered:
Figure 1
System components
1.
Transmitting/receiving antenna HG 98787ZA (different antennas can be used in
this system)
2.
Transponder HW DEV 00033 or Götting HG 71325ZA (on the track)
3.
Interpreter HG 71912-A with positioning impulse output and two types of inter-
faces: serial / CAN (HG 71912ZA) or parallel (HG 71912YA)
4.
Optional programming device for trovan
TM
transponder HG 8183
09A
(not
shown in picture)
1.2
Function
As the antenna passes over the transponder, it energizes the latter with an energy field
of 128 kHz. The transponder returns its code at half of this frequency.
The transponder position in relation to the antenna surface is measured by a coil with
orientation in direction of travel. The interpreter decodes the transponder code. Each
crossing of the coordinate axis in driving direction generates a positioning pulse with
an adjustable duration.
