Device Description HG G-71912-A | English, Revision 03 | Date: 28.03.2018
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Chapter 9 – Appendix
C.1 Data direction antenna -> PLC
In this direction, cyclical antenna data is transmitted. The duration is parameterizeable, it
should take an integral part or multiple of the transponder code transmission. The minimum
cycle duration depends upon the telegram length, the Baudrate and the chosen telegram
content.
The data sentence always starts with an "="-character (hex 3d). Then the parameters cho-
sen from the respective menu follow. The telegram is to be quit with an 8 bit check sum
over all characters. This check character is the result of ex-oring all characters. The charac-
ters are transmitted without delay.
C.2 Data direction PLC -> antenna
Commands are transmitted into this direction if necessary. Each command must start with
a "="-character (hex 3d). The format of the commands is described in Table 7 „Possible sys-
tem notes / error messages“ on page 19. The telegram is to be quit with a 8 bit check sum
(XOR) over all characters. The characters are sent without delay. The characters must be re-
ceived within the parameterizeable character delaytime. Otherwise the telegram will be
chopped.
D Parallel Output
After decoding of the transponder code valid the lower 15 bit will be set to the correspond-
ing outputs. The appropriate transponders of the driver circuit are set up to 24 V. Additionally
the DTR -output is activated for the duration adjustable. The increasing edge / slope of this
pulse can be used for the storage of the parallel data, e.g. of an PLC. The shoulder (duration
adjustable in the menu
Parallel Interface
-> DTR Setup Time; see section 6.2.2.4
on page 37) starts after connecting the code the the parallel outputs. A (possible) zero-code
will not lead to an activation of the DTR output. A multiple acceptance of the leads to an
activation of the output, if it is enabled (see (6.2.2.4 on page 37).
E Positioning Pulse
After crossing the center of the antenna a current limited (20 mA) output is set up to 24 V
for an adjustable time. Via the corresponding setup menu (6.2.2.7 on page 40) it is possible
to set whether the crossing of the antenna’s center generates a positioning pulse or if only
one pulse per crossing is output.
Additionally it is possible to set that the positioning pulse is only deallocated after a tran-
sponder has been decoded.
