JPS5841026B2 - intercom device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intercom device in which a plurality of operating sections are provided on the base unit side.

When operating this type of intercom from different locations, it is necessary to prevent the operability from deteriorating.

The present invention satisfies these conditions and is further provided with functions such as carrying out secret conversations between operating units and giving priority to the operating unit operated first, and will be described below along with embodiments thereof.

In the drawings, 1A and IB are operating units having the same internal structure, 2 is a line control unit, and 81 to S4 are slave devices.

In the operation sections IA and 1B, H8 is the handset, D is the handset number display, T is the call key, C is the clear key, K1 to Kn.
is the station number setting key.

In the line control unit 2, G1. G2 is a game for selecting the operation section 1-03 is a call key detection gate of T, G4 is a call state detection game 1-1G5. G6 is inverter, 01~G1
4 is a relay driver gate, FF-A and FF-B are flip-flops that hold the operation unit selection signal, A and B are selection relays for the operation units IA and IB, respectively, and contacts a1 to a
3. It has b1 to b3.

al, bl are communication path switching contacts, G2. b2 is a key manual signal switching contact; G3. b3 is a first-come-first-served operation detection contact.

CA and CB are anti-vibration capacitors for relays A and H, DA
, DB is a backflow prevention diode, and R1-R4 are slave station line selection relays.

3 is a register that stores data in keys using signals 1 to Kn, and outputs data using signals G1 to G3.

Note that the data and output are reset by the C key.

4 is a decoder which selects the office line to be connected based on the output of register 3 and operates relays R1 to Rn.

5 is an incoming call detection circuit, which detects when a call is received from a handset.
Detects the station line number and displays it on the display section of the operation panel.

La, Lb are communication lines, Ta, Tb are T key detection lines, L
C, LKl, LK2, . . . LKn are control signal detection lines, which are connected in parallel to each operating section.

Next, the operation will be explained.

Now, when a call is received from the handset S2, the station number is detected by the incoming call detection circuit 5 and displayed on the display sections of the operation sections IA and IB.

For example, when operating from the operation unit IA, press keys 1 to Kn and press 2 on the key corresponding to slave unit S2 to store it in register 3, and then press the T key to receive the signal output from register 3 by game 1-G3. is decoded by the decoder 4, operates the relay R2 through the driver gate G10, switches the contact r2, and selects the central line.

Also, by ANDing the output of G4 and the T key signal, a flip-flop FF-A is set through gates G1 and G5, and its output is applied to relay A via G7, causing relay A to operate.

When relay A operates, contact a3 disables relay B, contact a2 receives a key signal from the operating section IB, and contact a1 connects the communication path to the IA side via communication line La.

Therefore, the operating section 1B is disconnected during the call.

When the call ends, flip-flop FF-A is reset by pressing the C key, and at the same time as relay A returns, register 3 is also reset, and relay R2 also returns to its original state.

When operating from the operating section IB, the operation is opposite to that described above.

Furthermore, if the T keys are pressed at the same time from the operating sections IA and IB, only the relay A is activated by the contact a3, so that one operating section has priority.

The above description has been made regarding a call from a slave unit to a base unit, but when a call is made from a base unit to a slave unit, the same operation is performed, except that the call is received and the number display is no longer performed.

Although the above embodiment is based on the case where there are two operating units, it is possible to implement three or more operating units by adding similar circuits.

As is clear from the embodiments described above, according to the present invention, any slave unit can be easily called from any of the plurality of base unit side operation units.

Furthermore, by operating one operation unit, it is possible to make a call with priority over other subsequent operations.

[Brief explanation of drawings]

The drawing is a wiring diagram of an intercom device according to an embodiment of the present invention. IA, IB...Operation unit, H8...Transmitter, 2...Circuit control unit, K1-Kn...
・Station number setting key, 3...Register, 4...
...Decoder, FF-A, FF-B...Flip-flop, S1-S4...Slave unit.

Claims (1)

[Claims] 1. In an intercom device consisting of a plurality of operating sections each having a handset and a line control section that connects the operating section and a plurality of handsets, the line control section stores a signal from a station number selection key in the operating section. , a register that outputs the stored contents by the call key, a decoder that decodes the output of this register and selects a handset to make a call, and an operation of the operation section of the plurality of operation sections in which the station number selection key is not operated. An intercom device characterized by being provided with a flip-flop circuit that disables.