Method for synchronizing the bi-directional transmission of data
The invention relates to a method for synchronizing a bi-directional transmission of data between a transmitter and a receiver based on the transmission of frames ( 10 ) having a predefined bit length, with a predefined first bit length ( 20 ) being provided in each frame ( 10 ) for the transmission of data from the transmitter to the receiver and a predefined second bit length ( 30 ) for the transmission of data from the receiver to the transmitter, with a trigger pulse ( 40 ) being sent to the receiver parallel to and independently from the transmission of the data between the transmitter and receiver, which pulse triggers a data collection process at the receiver, wherein the frame ( 10 ) has a time slot ( 50 ), during which no information is transmitted from the transmitter to the receiver and also not from the receiver to the transmitter, and wherein the trigger pulse ( 40 ) is transmitted from the transmitter to the receiver during this time slot ( 50 ).
1. A method for synchronizing a bi-directional transmission of data between a transmitter and a receiver based on the transmission of frames having a predefined bit length, with a predefined first bit length being provided in each frame for the transmission of data from the transmitter to the receiver and a predefined second bit length for the transmission of data from the receiver to the transmitter, with a trigger pulse being sent from the transmitter to the receiver parallel to and independently from the transmission of the data between the transmitter and receiver, which pulse triggers a data collection process at the receiver,
characterized in that the frame has a time slot, during which no information is transmitted from the transmitter to the receiver and also not from the receiver to the transmitter, and that the trigger pulse is transmitted from the transmitter to the receiver in non-digitized form during this time slot.
2. The method according to claim 1 , characterized in that the length of the time slot is 3 to 8 bits.
3. The method according to claim 1 , characterized in that the first bit length and the second bit length are provided in the frame separated by some time delay bits.
4. The method according to claim 1 , characterized in that the time slot within the frame is provided within the first bit length.
5. The method according to claim 1 , characterized in that one or more stuff bits are inserted depending on the trigger pulse length.
6. The method according to claim 5 , characterized in that the stuff bits are inserted evenly distributed across several frames.
7. The method according to claim 5 , characterized in that N stuff bits are replaced with one synchronization frame when the number of the stuff bits is greater than or equal to N.
8. The method according to claim 7 , characterized in that N is equal to 5 or 6.
9. The method according to claim 1 , characterized in that the length of the first bit length is at least 14 bits.
10. The method according to claim 1 , characterized in that the length of the second bit length is at least 30 bits.
11. The method according to claim 1 , characterized in that the length of a frame is at least 60 bits and no more than 120 bits.
12. The method according to claim 1 , characterized in that the data are exchanged between a controller of the transmitter and measuring units of the receiver.
13. The method according to claim 12 , characterized in that the measuring units are configured as position measuring units.
14. The method according to claim 13 , characterized in that the position measuring units are configured as rotary encoders.
15. A system comprising a transmitter and a receiver, between which data are transmitted bi-directionally, wherein the transmission of the data is carried out with the method according to claim 1 .
16. The system according to claim 15 , characterized in that the data are exchanged between a controller of the transmitter and measuring units of the receiver.
17. The system according to claim 16 , characterized in that the measuring units are configured as position measuring units.
18. The system according to claim 17 , characterized in that the position measuring units are configured as rotary encoders.
19. The method according to claim 3 , characterized in that the some time delay bits are 4 to 7.
20. The method according to claim 5 , characterized in that one or more stuff bits are inserted directly before the first bit length.