JPH02276174A - Hdlc loop connector - Google Patents

Abstract

PURPOSE:To enable removal or changeover of an input/output device, which has gone wrong during operation of a loop by equipping a light emitting diode for indicating the operating conditions of an interlocking-type changeover switch and a connector changeover switch for bypassing between required terminals and cutting off a terminal controller and an input/output device from a line path. CONSTITUTION:When the movable contact of an interlocking switch SW is changed over from the fixed contact on the normal side to the through side of an upper fixed contact, a terminal L2 is connected to L1 and + is connected to E through a normal-open contact S1c and a contact S2 and it becomes through conditions, and by normal-close contacts S1b and S2b opening, the input/output device, etc. are cut off from the loop. At the same time, the normal- open contact S3c of S3 closes, and the interpath operating voltage of the loop is applied, whereby an LED lights and indicates that the connector is changed over to the through conditions. This connector can be realized by assembling the functional part of a conventional rosette and the changeover switch as separate parts and wiring them.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for removing a terminal control device and/or input/output device connected to an HDLC loop due to a failure.
Alternatively, if a terminal control device and/or input/output device becomes disconnected due to a failure, a switch circuit is installed to bypass these devices so as not to affect the operation of other terminal control devices and input/output devices. Regarding connectors (rosettes).

[Prior Art] Since the HDLC loop has a loop-shaped line, if one input/output device, etc. included in the loop fails and becomes disconnected, all remaining terminals connected to the loop cannot be controlled. Devices, input/output devices, etc. also become inoperable. In addition, even if an input/output device, etc. causes a failure other than a disconnection, if this device is removed, other healthy devices in the loop will stop working for the same reason, so the loop will not be able to operate the failed device. It was impossible to replace it while it was there.

[Problems to be Solved by the Invention] The HDLC loop connector of the present invention allows even if there is a malfunctioning input/output device, etc., to operate the loop without affecting the operation of other terminal control devices or input/output devices in the loop. The objective is to be able to maintain the loop in a through state, and also to enable the removal and replacement of failed input/output devices while the loop is in operation.

[Means for Solving the Problems] In order to achieve the above object, the HDLC connector of the present invention bypasses required terminals and connects terminal control devices and input/output devices to the conventional HDLC rosette part. It is equipped with an interlocking changeover switch for disconnecting from the track, and a light emitting diode to display the operating status of the connector changeover switch.

[Function] With the above means, when the input/output device etc. is in a normal operating state, the input/output line is normally connected to the corresponding terminal of the input/output device etc.

However, if an input/output device or the like fails, the changeover switch is switched so that the input/output line is in a through state. In addition, light emitting diodes (LE
D) is lit to indicate the through state.

[Example 1] FIG. 1 is a diagram showing a circuit diagram of an HDLC loop connector of the present invention together with the state of connection with lines, input/output devices, etc.

As shown in FIG. 1, the HDLC loop connector of the present invention connects four terminals Ll, L2, E, and + connected to the HDLC loop and connects the loop to the terminal control device TC or input/output device via a changeover switch. It has terminals Lll and El for connection to @I10.

The terminal Ll is connected to the movable contact Sla of the first switch Sl of the interlocking changeover switch SW, and is connected to the normally closed contact S of Sl.
lb is connected to terminal Lll, and the normally open contact Slc is connected to terminal L2.
are connected to each.

The terminal E is connected to the movable contact S2a of the second switch S2 of the interlocking changeover switch SW, and is connected to the normally closed contact S2 of S2.
b is connected to the terminal E1, and the normally open contact S2c is connected to the terminal 10.

The movable contact S3a of the third switch S3 of the interlocking changeover switch SW is connected to the movable contact S2a of the second switch S2, the normally closed contact S3b of S3 is not connected, and the normally open contact S3c is connected to the LED and the resistor. It is connected to 5la (Ll) via.

From terminal L2 to terminal RDa of input/output device, etc., from Lll to SDa, from terminal 10 to RDb, from terminal El to terminal SD
b, respectively.

The above interlocking switch SW is illustrated in FIG. 1 with each movable contact in a normal state, and when the movable contact switches from the normal side fixed contact to the through side of the upper fixed contact, the normally open contact S I C % and S2 contacts, terminal L2 is connected to Ll, and + is connected to E, respectively, resulting in a through state. Also, by opening normally closed contacts Slb and S2b, input/output devices etc. are connected to the loop. be cut off from

At the same time, the normally open contact S3c of S3 is closed and the line opening operating voltage of the loop is applied, causing the LED to light up.
Indicates that the connector of the present invention is switched to the through state.

The connector of the present invention can be realized by assembling the functional parts of a conventional rosette and a changeover switch as separate parts and wiring them as shown in FIG.

Figure 2 shows an embodiment in which each terminal board and a plurality of fixed and movable switch contacts are attached to a connector case, and the connector case is also used as the switch case.
> is a view from the back side with the back cover of the connector case removed, Figure 2 (b) is a cross-sectional view taken along line bb in Figure 2 (a), and Figure 2 (C) is a view of the switch. It is a side view seen from the knob side.

On the right side of FIG. 2, 21 is an insulating case molded from a material such as synthetic resin, and 22 is the back cover of the case (the broken line indicates the mounting position), which is shown in a removed state. Each terminal, Ll, L2, +, ElLll, and El, is arranged on the front side of the case and fixed with bolts 23 from the back side. SIA, SIB, SIC, etc. shown in Figure 2 are as follows:
Switch contacts 5laSSlb and S shown in FIG.
The symbol corresponds to lc, etc., but it is not a switch symbol, but is used to indicate that it is a contact with a specific structure.
The last letter is capitalized.

The contact SIA is, for example, a part obtained by punching a thin metal plate with high elasticity and press-forming it. When installing terminal L2, prepare a bolt that passes through a hole provided at the base of contact SIA, lead the tip of the bolt from the back side of the case to the case surface through the hole previously provided in the case, and attach terminal L2. By screwing a bolt into the tapped hole provided in the center of the case, L2 and SIA can be attached to the front and back sides of the case at the same time with a single bolt. Further, since the electrical connection between L2 and SIA is completed through bolts at the same time as the installation, the trouble of wiring can be omitted.

The fixed contacts SIB and SIC are manufactured by molding metal thicker than the movable contacts, and are fixed to the case together with the terminals Lll and Ll, respectively, using bolts in the same process as for attaching the movable contacts described above. Each fixed contact has contact material 25
However, it is also possible to attach contact material to the movable contact side instead. Furthermore, plating with precious metal may be applied. Considering the purpose of using this switch in the event of equipment failure or for inspection or replacement, it is only operated relatively rarely, and the voltage and current used are small. It is possible to employ a switch with a small size and simple structure. However, when switching to through, it must be possible to reliably maintain the loop in the passing state.

This completes the assembly of the contacts of the switch S1 and the associated terminals, but the process for the other switches 82 and s3 is similar, so the explanation will be omitted. However, movable contact S2A
and 33A are different in the embodiment shown in FIG. 2 in that they are made integrally and can be attached to the ten terminals with one bolt for rationalization.

In order to switch the movable contacts of the switches S1, S2, and S3 in conjunction with each other, in the embodiment shown in FIG.
An assembly is used which is rotatable by an actuation knob 28. Insert the shaft of this assembly into the grooves 29A and 29B provided on the opposing walls of the case, and after confirming that each cam is at the 0 position above its respective movable contact, attach the back cover to the case. , when the back cover is fixed, the projections provided on the back cover fit into the grooves 29A and 2, leaving a dimension slightly larger than the diameter of the shaft.
Fit into the case so as to fill in 9B.

With this structure, by rotating the operating knob 28, the cam can drive the movable contact from the normally closed fixed contact side to the normally closed contact side, and by rotating the operating knob 28 in the opposite direction, the movable contact can be driven to the normally closed contact side by rotating the operating knob 28. It can operate to return to the closed contact side.

If such a configuration is adopted, although it is necessary to newly design the case, terminal board, switch contacts, etc., costs can be reduced compared to combining a connector and an independent changeover switch.

[Effects of the Invention] As explained above, even if the input/output device connected to it fails, the HDLC connector of the present invention can maintain the quality of the connector without affecting other devices in the loop. It is possible to bypass a failed device in minutes.

This provides the advantage of being able to freely remove or replace a failed device even while the loop is in operation. In addition, since the switching operation for bypass is easy, it is possible to quickly recover even in the event of a loop break by asking the customer to switch the switch until a repair technician comes to repair the problem. It becomes possible.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an HDLC connector of the present invention, and FIG. 2 is a diagram showing the structure of an embodiment in which a connector and a switch are integrated. Ll, L2, Lll, +, E, El: Terminal SW: Changeover switch 21: Connector case 22: Back cover 23: Switch contact fixing bolt 24: Terminal bolt 25: Contact material 26A-C: For movable contact drive Cam 27: Cam shaft 28, operating knob 29A, B: cam bearing is groove

Claims (1)

[Claims] A terminal board for connecting the input/output line of the HDLC loop, the terminal control device and the input/output device, and a terminal board that connects the input side line directly to the corresponding output side line in the event of a failure of the terminal control device and/or input/output device. A switch with a normally open contact for connection, a switch with a normally closed contact provided between the line terminal on the output side of the HDLC loop and the terminal control device and/or input/output device, and a switch with a normally closed contact provided between the line terminal on the output side of the HDLC loop and the loop line terminal. A series circuit of a resistor and a light-emitting diode, connected through the normally open contact of the switch,
The above-mentioned switches are configured to be switchable in conjunction with each other, and when the terminal control device and/or input/output device malfunctions, by switching the switch from the normal position to the through state side, the terminal control device and/or input/output device can be switched. Or an HDLC loop connector that disconnects the input/output device from the line, connects the input line directly to the output line, and lights up a light emitting diode to indicate the through state.