JPS61270951A - Time division multiplex transmission system - Google Patents

Abstract

PURPOSE:To prevent the voltage drop of a line and to improve reliability by providing a terminal device for controlling are electric power source for every block composed of plural relays, turning on and off the electric power source in address sequence for every block, and polling respective relays. CONSTITUTION:To the master device P of a fire alarm, relay boards Q1, Q2... to divide plural relays to for every block are connected. To respective relay boards, a terminal device S for controlling the electric power source is connected. To the terminal device S for controlling the electric power source and a relay T, a series of the address, for example, a addresses 1 and 15 are supplied to the terminal S of the relay board Q1, addresses 2-14 are supplied to the relay T, addresses 16, 30 are supplied to the terminal device S of the relay board Q2, addresses 17-29 are supplied to the relay T, and thereafter, the same operation is executed. The electric power source is turned on to the relay board Q1 by an address signal 1, and the electric power source is turned off by an address signal 16 after respective relays 2-14 are polled. The relay board Q2 is energized by an address signal 17, and thereafter, in the same way, polling is executed. Thus, the electric power source is time-divided and supplied, the voltage drop of the line is minimized and the electric power source capacity is made smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method of supplying power to each terminal in a time division multiplex transmission system.

[Background technology] In general, in disaster prevention systems for buildings, factories, etc. or lighting load control systems that use this type of system, power for each terminal device is often supplied from the main unit through a dedicated line. There are two types: one in which a power line is provided separately from the signal line, and the other in which the signal pulse voltage is rectified and smoothed at each terminal to receive power. In either case, the base unit must be equipped with a power supply with a capacity commensurate with the number of terminals that can be connected, and as the number of terminals increases, voltage drop due to line resistance becomes a problem, especially as shown in Figure 2. As shown, each terminal T is equipped with a monitoring sensor Di, D2. ..., Dn are connected, and if a large number of monitoring sensors operate simultaneously, current consumption increases and there is a risk that the specified voltage cannot be maintained.

[Objective of the Invention 1 The present invention has been made in view of the above-mentioned problems, and its purpose is to eliminate the need to consider voltage drop due to line resistance, and to reduce the capacity of the power supply provided in the main unit. The purpose of the present invention is to provide a time division multiplex transmission system that requires only a small device.

[Disclosure of the Invention 1 The present invention provides a time division multiplex transmission system in which a power supply current is supplied from a base unit to each terminal, in which a plurality of terminals are arranged as one block in the order of polling addresses, and the terminals in the block are Each block is provided with a power control terminal that turns on and off the power supply, and the minimum address and maximum address within the block are assigned to the power control terminal for power on and power off. ,
The feature is that the required power supply current is reduced by supplying power only to the terminal device of the block that is communicating.

[Embodiment] Fig. 1 shows an embodiment of the time division multiplex transmission system of the present invention, which is used as a fire alarm. From P, power supply current is supplied to each terminal device T and power supply control terminal device S, which are repeaters of the fire alarm system, and polling is performed sequentially, and a plurality of terminal devices T are connected to the repeater as one block in the order of polling addresses. Board Q l t Q 2 t...
・It is stored in. Each repeater board QItQ2t...
The power supply control terminal S provided in each of the terminals S is for turning on or off the power supply to the terminal T in the panel. It is assigned for power on and power off.

In FIG. 1, if it is assumed that imp is sequentially polling the terminals T or S at addresses 1 to 150, for example, polling at address 1 causes the power control terminal S of the first repeater panel Q1 to be polled. Address 2~
Turn on the power to the terminal device T of No. 14, and then input the address of 2. After polling addresses 3, . . . , address 14, power control terminal S is sent to address 15.
turns off the power to the terminal T. Then, by polling address 16, the power control terminal S of the second repeater panel Q2 turns on the power of the terminal T in the repeater panel Qz, and does the same. Then, polling is performed while sequentially supplying power to each block up to the final address 150.

For example, as in the above embodiment, the number of repeaters in one block is 1.
If the whole is divided into 10 blocks with 3 terminals, 10 power supply control terminals S will be required, but the current consumption will be 1
Since it becomes 78 or less, the problem of voltage drop due to line resistance is solved, and the parent 8! The capacity of the power supply provided in P can be similarly reduced.

[Effects of the Invention] As described above, in the time division multiplex transmission system of the present invention, a plurality of terminal devices are arranged in one block in the order of polling addresses, and each terminal device for power control that turns on and off the power supply to the terminal devices in the block is arranged in one block. Since it is installed in each block to control the power on and off of the terminal equipment for each block, it solves the problem of line voltage drop and improves the reliability of the system. 14] Modified 4r Kiiri-

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing one embodiment of the present invention, and FIG.
The figure is a block circuit diagram of a conventional example. P is the main unit, T is the terminal, S is the power control terminal, Q,
, Q , ... is t77, D 1 , D 2
+'・, Dnl monitoring sensor. Agent Patent Attorney Ishi 1) Chief 7111 Figure 2 Procedure Amendment (Voluntary) July 5, 1985

Claims (1)

[Claims] (1) In a time division multiplex transmission system in which power supply current is supplied from a base unit to each terminal, multiple terminals are grouped into one block in the order of polling addresses, and power supply control is performed to turn on and off the power supply to the terminals in the block. A time division multiplex transmission system characterized in that a terminal device for power control is provided in each block, and a minimum address and a maximum address within the block are assigned to the power control terminal device for power-on and power-off purposes.