Calibration method in a data transmission system

Claim 2

A calibration method in a data transmission system including a data transmitter and a receiver remote therefrom which are coupled together through a transmission path, the data transmitter including a plurality of measuring points and the receiver including corresponding processing points which must be calibrated, said measuring and processing points being coupled together in a cycle through a time division multiplex circuit in which system only the magnitude of a variation at a measuring point which occurred during the previous cycle period is transmitted, characterized in that at the measuring point (1) which is formed with a variable direct voltage source (2) including a terminal (4) conveying a voltage to be varied between a minimum (0) and a maximum reference potential (VR) the adjustment of the source (2) is modified to one of the said potentials and subsequently to the other, the information regarding the variation being transmitted through the transmission path (19) to the receiver (20,21,22), while in the receiver, which is formed with a store (25), the information regarding variation is superimposed on the store information present for the processing point (29) up to and not farther than a fixed minimum or maximum value which corresponds to one of the said potentials (0, VR) at the measuring point (1).

Claim 3

A calibration method as claimed in claim 1, characterized in that in a data transmission system including a data transmitter (1-18) for a plurality of receivers (20,21,22...) coupled thereto, which are each formed with a store (25), the adjustment of the variable direct voltage source (2) at the measuring point (1) of the data transmitter is modified for effecting calibration after the data transmitter is decoupled from a receiver (e.g. 22) and is coupled to another receiver (e.g., 20).

Claim 4

A data transmission system, comprising a data transmitter; a data receiver remote from the transmitter; and a transmission path coupling the transmitter to the receiver, the data transmitter comprising a plurality of measuring points each individually capable of providing measuring signals corresponding to differential increases and decreases in the magnitude of the corresponding measuring point, the maximum magnitudes of all the measuring points being substantially equal, the minimum magnitudes of all the measuring points being substantially equal, sampling means for cyclically converting the measuring signals into a time division multiplex signal, means for transmitting the time division multiplex signal through the transmission path to the data receiver; the data receiver comprising a processing point correspoinding to each measuring point, the processing points each capable of being set to a maximum and a minimum magnitude in response to processing signals, means for converting the received time division multiplex signal into a series of received measuring signals, a memory connected to the processing points for storing processing signals corresponding to each processing point, means for superimposing the received measuring signals on the corresponding stored processing signals, the result of the superimposition being stored in the storage means as an updated processing signal, detector means connected to the superimposing means for sensing an updated processing signal exceeding a value corresponding to the maximum magnitude of the measuring points and for substituting into the memory in response thereto an updated processing signal corresponding to the maximum magnitude of the measuring points, the detection means further sensing an updated processing signal having a value less than the value corresponding to the minimum magnitude of the measuring points and for substituting in response thereto into the memory an updated processing signal corresponding to the minimum magnitude of the processing points, whereby manual adjustment of a measuring point to the maximum and then to the minimum values synchronizes the measuring points to the processing points.

Claim 5

A data transmission system, comprising a data transmitter; a data receiver remote from the transmitter; and a transmission path coupling the transmitter to the receiver, the data transmitter comprising a plurality of measuring points each individually capable of providing measuring signals corresponding to differential increases and decreases in the magnitude of the corresponding measuring point, the maximum magnitudes of all the measuring points being substantially equal, the minimum magnitudes of all the measuring points being substantially equal, sampling means for cyclically converting the measuring signals into a time division multiplex signal, means for transmitting the time division multiplex signal through the transmission path to the data receiver; the data receiver comprising a processing point correspoinding to each measuring point, the processing points each capable of being set to a maximum and a minimum magnitude in response to processing signals, means for converting the received time division multiplex signal into a series of received measuring signals, a memory connected to the processing points for storing processing signals corresponding to each processing point, means for superimposing the received measuring signals on the corresponding stored processing signals, the result of the superimposition being stored in the storage means as an updated processing signal, detector means connected to the superimposing means for sensing an updated processing signal exceeding a value corresponding to the maximum magnitude of the measuring points and for substituting into the memory in response thereto an updated processing signal corresponding to the maximum magnitude of the measuring points, the detection means further sensing an updated processing signal having a value less than the value corresponding to the minimum magnitude of the measuring points and for substituting in response thereto into the memory an updated processing signal corresponding to the minimum magnitude of the processing points, whereby manual adjustment of a measuring point to the maximum and then to the minimum values synchronizes the measuring points to the processing points.

Claim 6

A data transmission system as claimed in claim 3, wherein the store comprises a digital store, the receiver further comprising a pulse counter for reading the store, a clock pulse source connected to the pulse counter, a counter for address information and a read counter, the transmission path being connected through a shift register to the superimposition stage, address information outputs of said shift register being connected to an address comparator to which the said counter for address information is connected, said address comparator applying stop and start signals to the counter for addressing information and to the superimposition stage.

Claim 7

A data transmission system as claimed in claim 3, further comprising a shift register connecting the superimposition stage to the information input of the store, while the said unit for introducing the maximum or the minimum value has an output connected to a set input of the shift register.