JPH04248281A - Connector connection confirming circuit - Google Patents

Abstract

PURPOSE:To confirm the electrical connection condition between the connector of a printed substrate and the connector of a cable by forming a regressive loop with a circuit at the transmission side through an earthed signal line, a specific signal line of a connection cable, and the like. CONSTITUTION:A signal line 111 earthed in a unit 102 is connected to a specific signal line 108a of a cable 107 through a connector 105 at the unit side and a connector 106 at the cable side. Furthermore, it enters in a unit 101 through a connector 104 at the cable side and a connector 103 at the unit side, it is turned back in the unit 101, and connected to a specific signal line 108b of the cable 107 through the connector 103 and the connector 104 again. Then, it is connected to a sensor amplifier 109 in the unit 102 through the connector 106 and the like, and a regressive loop is composed. As a result, when a signal passing through the regressive loop is cut off on the way, it is detected by a microcomputer 110, and the condition of the electrical connection between the connectors of a printed substrate and of the cable can be confirmed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector connection confirmation circuit for confirming the connection state of a connector when connecting a printed circuit board with a cable.

0002

[Prior Art] When connecting printed circuit boards with cables, the conventional means for checking the connection state between the printed circuit board connector and the cable connector is to visually check the connection state between the printed circuit board connector and the cable connector. It is common to use a method of checking.

0003

[Problems to be Solved by the Invention] The conventional means for confirming the connection between a printed circuit board and a cable connector as described above appears to be a connection between the printed circuit board and the cable at first glance; Specifically, it has the disadvantage that it cannot detect cases where the connection is incomplete, and it also cannot detect cases where the connection is forgotten.

0004

[Means for Solving the Problems] The connector connection confirmation circuit of the present invention connects a grounded signal line of a circuit unit on a transmitting side to a specific signal line of a connecting cable, and connects the specific signal line to a circuit on a receiving side. A return loop is formed by looping back and connecting the connection cable to another specific signal line in the unit, and when the signal passing through the return loop is interrupted on the way, it is detected by a microcomputer. This is what I did.

[0005]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

The embodiment shown in FIG. 1 includes a first unit 101 and a second unit 102 each having unit-side connectors 103 and 105 for cable connection on a printed circuit board, and cable-side connectors 104 and 106 at both ends. This is an example of connection using a provided cable 107. The signal line 111 that is grounded within the unit 102 is connected to a specific signal line 108a of the cable 107 via the unit side connector 105 and the cable side connector 106.
The signal is connected to the unit 101 via the cable-side connector 104 and the unit-side connector 103, is turned back inside the unit 101, and is connected to a specific signal of the cable 107 via the unit-side connector 103 and the cable-side connector 104. The sensor amplifier 10 in the unit 102 is connected to the wire 108b through the cable side connector 106 and the unit side connector 105.
Connected to 9. The output signal of the sensor amplifier 109 is input to a microcomputer 110. The microcomputer 110 checks whether the connection state of the cable 107 is good or not depending on whether the logical value of the input signal is "1" or "0".

For example, if there is a poor connection between the cable side connector 104 and the unit side connector 103,
Since the signal line 108a rises above the ground level, the logical value of the output signal of the sensor amplifier 109 becomes "1",
Therefore, the logical value of the input signal to the microcomputer 110 is "1". As a result, the microcomputer 111 detects a connection failure.

[0009] When all connector connections are normal,
The logical value of the output signal of the sensor amplifier 109 becomes "0", and the logical value of the input signal of the microcomputer 110 becomes the logical value "0". Therefore, the microcomputer 110 determines that the connection of the cable 107 is normal. In addition, by using the terminals at both ends of each connector as the terminals for the above-mentioned loop signal, the ability to detect a cable connection failure can be improved.

FIG. 2 is a circuit diagram showing a second embodiment of the present invention.

The embodiment shown in FIG. 2 is an example in which the present invention is applied to a case where three units are connected to one unit using three connection cables.

In this embodiment, as shown in FIG.
The connection state when cable-side connectors 206 and 208 at both ends of cable 209 are connected to unit-side connectors 205 and 207 of units 201 and 202, respectively, is input to a microcomputer 212 via a sensor amplifier 211. cable 217
The connection state when the cable-side connectors 214 and 216 at both ends of the unit are connected to the unit-side connectors 213 and 215 of the units 201 and 203, respectively, is input to the microcomputer 212 via the sensor amplifier 219. The connection state when cable-side connectors 221 and 223 at both ends of cable 224 are connected to unit-side connectors 220 and 222 of units 201 and 204, respectively, is input to microcomputer 212 via sensor amplifier 226.

The microcomputer 212 checks whether the connection state of the cables 209, 217, and 224 is good or not based on whether the logical values of the signals input from the sensor amplifiers 211, 219, and 226 are "1" or "0". .

In these embodiments, a break in the cable itself can also be detected.

[0015]

As explained above, the connector connection confirmation circuit of the present invention connects the grounded signal line in the transmitting side circuit to a specific signal line of the connection cable, and connects the specific signal line to the receiving side. In the circuit, a return loop is formed by looping back and connecting to another specific signal line of the connection cable, and when the signal passing through this return loop is interrupted, the microcomputer detects it. This has the effect that it is possible to check the electrical connection state between the connector of the cable and the connector of the cable.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a second embodiment of the present invention.

[Explanation of symbols]

101 unit 102 units 103 Unit side connector 104 Cable side connector 105 Unit side connector 106 Cable side connector 107 Cable 108a Signal line 108b Signal line 109 Sensor amplifier 110 Microcomputer 201 unit 202 Unit 203 Unit 204 unit 205 Unit side connector 206 Cable side connector 207 Unit side connector 208 Cable side connector 209 Cable 211 Sensor amplifier 212 Microcomputer 213 Unit side connector 214 Cable side connector 215 Unit side connector 216 Cable side connector 217 Cable 219 Sensor amplifier 220 Unit side connector 221 Cable side connector 222 Unit side connector 223 Cable side connector 224 Cable 226 Sensor amplifier

Claims (2)

[Claims] Claim 1: A grounded signal line of a circuit unit on a transmitting side is connected to a specific signal line of a connecting cable, and the specific signal line is connected to another specific signal line of the connecting cable in a circuit unit on a receiving side. A connector connection confirmation circuit characterized in that a return loop is formed by connecting the return loop, and when a signal passing through the return loop is interrupted midway, a microcomputer detects it. 2. A transmitting side circuit unit comprising a unit side connector to which a grounded signal line is connected, and a unit side connector to which the grounded signal line of a cable side connector coupled to one end is connected to correspond to a terminal. A connection cable in which a first specific signal line is connected to a terminal and a second specific signal line is connected to a specific terminal of a cable side connector that is coupled to the other end, and a cable that is coupled to the other end. a receiving side circuit unit having a unit side connector connecting terminals corresponding to terminals to which the first specific signal line and the second specific signal line of the side connector are connected, the transmitting side circuit unit; A sensor amplifier is connected to the terminal of the unit side connector to which the second specific signal line is connected, and the output signal of the one-shot circuit is inputted to the sensor amplifier into a microcomputer that checks the connection state of the connection cable. A connector connection confirmation circuit characterized by: