Position measuring device
First Claim
1. Position measuring device with a device for serial data transmission between the position measuring device and a processing unit, the position measuring device comprising a component with a connection logic, in which a code word defining the absolute position is formed from the sampling signals of at least one sampling device, which can be taken to an output component, which causes a bit-serial transmission of the code word across a data line coupling the position measuring device and processing unit in response to a first command (status) sent by the processing unit, the position measuring device also having several memory regions with specific parameters of the position measuring device saved in one of the several memory regions, which can also be transmitted serially to the processing unit across said data line in response to a second command (status) sent by the processing unit, which allows the processing unit to be adapted to these parameters, and another one of the several memory regions is used for decoding commands sent by the processing unit to the position measuring device on said dataline as serial binary data words.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention concerns a device and a method for serial data transmission. In the position measuring device there is provided a memory, in which specific parameters of the position measuring device are kept. These parameters can be sent on the data line to a processing unit, by which the measurement values are transmitted during the position measurement. By receiving the parameters, the processing unit is adjusted to the connected position measuring device.
70 Citations
22 Claims
- 1. Position measuring device with a device for serial data transmission between the position measuring device and a processing unit, the position measuring device comprising a component with a connection logic, in which a code word defining the absolute position is formed from the sampling signals of at least one sampling device, which can be taken to an output component, which causes a bit-serial transmission of the code word across a data line coupling the position measuring device and processing unit in response to a first command (status) sent by the processing unit, the position measuring device also having several memory regions with specific parameters of the position measuring device saved in one of the several memory regions, which can also be transmitted serially to the processing unit across said data line in response to a second command (status) sent by the processing unit, which allows the processing unit to be adapted to these parameters, and another one of the several memory regions is used for decoding commands sent by the processing unit to the position measuring device on said dataline as serial binary data words.
-
9. Method for serial data transmission between a position measuring device and a processing unit, the method comprising the steps of:
transmitting commands (status) bit-serially as data words from the processing unit to the position measuring device;
instructing the position measuring device to either execute a command (status), and to send a position measurement value as a binary data word or a parameter saved in the position measuring device as a binary data word to the processing unit in dependence on the command (status), or receive parameters from the processing unit and store them in a memory region, wherein the commands (status), the parameters, and the position measurement values are transmitted on a common data line.- View Dependent Claims (10, 11, 12, 13, 14)
-
15. Position measuring device with a device for serial data transmission between the position measuring device and a processing unit, the position measuring device comprising:
- a component with a first connection logic in which a code word defining the absolute position is formed from the sampling signals of at least one lower-resolution code track with at least one higher-resolution code track, which can be sent to an output component, which brings about a bit-serial transmission of the code word across a data line coupling the position measuring device and processing unit in response to a command (status) sent by the processing unit, there being a second connection logic provided in the processing unit with the same function as the first connection logic, and sampling signals can also be sent directly to the processing unit by bypassing the connection logic wherein the sampling signals are converted to a data word by the second connection logic, so that the code word is compared to the data word formed in the processing unit, and an error signal is output if the code word and data word do not agree.
- View Dependent Claims (16, 17)
- 18. Position measuring device with a device for serial data transmission between the position measuring device and a processing unit, the position measuring device comprising a component with a connection logic, in which a code word defining the absolute position is formed from the sampling signals of at least one sampling device, which can be sent to an output component, which brings about a bit-serial transmission of the code word across a data line coupling the position measuring device and processing unit in response to a command (status) sent by the processing unit, the sampling signals forming two code groups with one higher and one lower-resolution code group, and a shift between at least one sampling signal of the higher-resolution code group and a sampling signal of the lower-resolution code group with respect to a nominal position is monitored and when a predetermined tolerance region is exceeded, a warning signal is output.
Specification