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Appendix
English, Revision 02, Date: 12.07.2011
56
C
Procedure "transparent"
For the interconnection antenna <—> PLC a transparent protocol can be used. The fol-
lowing settings have to be observed for the data transmission:
-
1 start bit, 8 data bit, parity even, 1 stop bit, Baudrate 9600 Baud (default) or
19200 Baud.
C.1
Data direction antenna -> PLC
In this direction, cyclical antenna data is transmitted. The duration is parameterizea-
ble, 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
chosen 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 characters 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 system 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 received 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 corre-
sponding 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 5.2.2.4 on page 41) 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
(5.2.2.4 on page 41).
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 (5.2.2.7 on page 44) 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
transponder has been decoded.