Device Description HG G-71912-A | English, Revision 03 | Date: 28.03.2018
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Chapter 9 – Appendix
A.3 Induced Voltages in Sum and Difference Antenna
Figure 25
Induced voltages in sum- and difference antenna
B Procedure 3964R
For the computer interconnection between antenna <–> PLC a 3964R-Protocol may be
used. As the antenna outputs data cyclically, this results in some simplifications for the im-
plementation of the 3964R. The following diagrams describe the procedure.
The following settings need to be observed:
–
Transponder system has lower priority
–
Data transfer is set to 1 start bit, 8 data bit, even parity, 1 stop bit, baud rate
9600 baud (default) or 19200 baud.
B.1 Data direction antenna -> PLC
In this direction the antenna data is transmitted cyclically. A set of data always starts with
an "="-character (hex 0x3d). The cycle time is parameterizeable and should be an integer
part, or a multiple thereof, of the transponder code´s transmission time. For this system, the
duration for the transponder code transmission is 8 ms. The minimum cycle duration de-
pends upon the telegram length, therefore on the baud rate and the selected telegram con-
tent.
In the following status diagram
T_ZVZ stands for the programmable character delay and
T_QVZ for the programmable acknowledgement delay.
U
Difference
U
Sum
Transponder direction of movement
