JPS6282840A - Bus termination system - Google Patents

Abstract

PURPOSE:To omit a receiving unit provided with termination parts, to use only one kind of receiving units and to release the restriction of packaging positions by extending the final end of a bus up to a transmitting unit to terminate the bus by the transmitting unit. CONSTITUTION:When a digital signal is to be transmitted from a transmitting unit 1-1 to plural receiving units through a bus 7 for terminating a termination parts 8 on the final end, the final end of the bus 7 is taken in the unit 1-1. Namely, the parts 8 is inserted into the unit 1-1 and terminated in the unit 1-1. In said procedure, restriction to package a receiving unit with a terminating parts on the final end position of the bus 7 without fail in the initial stage at the packaging of the receiving unit can be omitted. Since the receiving unit with the terminating parts can be omitted, only one kind of receiving units may be used and the restriction of packaging positions can be released.

Description

[Detailed description of the invention] [) Already required] When transmitting digital signals from a transmitting unit to a plurality of receiving units via a bus that requires terminating a terminal component at the final end, the plurality of receiving units are By taking in the final end of the routed bus into the sending unit, and by providing the sending unit with a termination component and terminating it at the sending unit, only one type of receiving unit is required for the plurality of receiving units. This eliminates restrictions on location when connecting via bus.

[Industrial application field]

The present invention is based on data communication related standards Vll of the CCITT Recommendation.
This invention relates to an improvement in a bus termination method when transmitting digital signals to a plurality of receiving units via a bus that requires terminating a termination component at the final end, as defined in .

In the above-mentioned bus termination method, only one type of receiving unit is required, and it is desirable that there are no positional restrictions when connecting the receiving units to the bus.

[Conventional technology] FIG. 2 is a block diagram of a conventional bus termination system.

In the figure, 1 is a transmitting unit, 2 to 5 are receiving units, 6-1
7 indicates a receiving unit with a terminal component, 7 indicates a bus, and 8 indicates a terminal component.

Conventionally, when transmitting a digital signal from a transmitting unit 1 to a plurality of receiving units 2 to 5 and 6-1 via a bus 7, whether the receiving units 2 to 5 are installed or when the number is expanded later. However, the receiving unit 6-1 with termination component must be installed at the final end of the bus 7, and the path 7
is terminated with a termination component 8, and the later receiving units 2 to 5 are mounted at any position, whether they are mounted initially or when added later.

[Problem that the invention seeks to solve]

However, the above method has the problem that two types of receiving unit h are required, one with termination parts and one without, and the receiving unit to be mounted first has termination parts, and the mounting position must be on the bus. There is a problem in that there is a restriction on the mounting position, which must be placed at the final end position.

[Means for solving problems]

The above problem is that the final end of the bus (7) that has passed through multiple receiving units (2 to 6) is taken into the transmitting unit (1), and the transmitting unit (1) is provided with a terminal component (8). , is solved by the bus termination method of the present invention, which terminates at the transmitting unit (1).

[Effect]

According to the invention, the bus includes a plurality of receiving units (2-6)
After passing through, the final end is taken into the transmitting unit (1), where it is terminated with the terminating part (8), so there is no need for a receiving unit with a terminating part; just one type is sufficient. Further, there is no need to limit the mounting position of the receiving unit.

〔Example〕

FIG. 1 is a block diagram of a bus termination system according to an embodiment of the present invention.

In the figure, 1-1 is a transmitting unit, and 6 is a receiving unit, and the same reference numerals indicate the same functions throughout the figures.

The difference between FIG. 1 and FIG. 2 is that the final end of the path 7 is extended to the transmitting unit 1-1 and terminated at the termination component 8 there.

In this way, when mounting a receiving unit, there is no need to first mount a device with a termination component at the final end position of path 7, and a receiving unit with a termination component is not required. One type is sufficient.

〔Effect of the invention〕

As explained in detail above, according to the present invention, only one type of receiving unit is required, and when mounting a receiving unit, there is no restriction that a device with a termination component must be mounted at the final end of the bus. This has the effect of making it unnecessary.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a bus termination method according to an embodiment of the present invention. FIG. 2 is a block diagram of a conventional bus termination system. In the figure, 1.1-1 is a transmitting unit, 2 to 6 are receiving units, 6-1 is a receiving unit with terminal parts, 7 is the bus, 8 indicates a terminal part.

Claims (1)

[Claims] A digital signal is transmitted from a transmitting unit (1) to a plurality of receiving units (2 to 6) via a bus (7) that must terminate with a termination component (8) at the final end. In this case, the bus (7) via the plurality of receiving units (2 to 6)
A bus termination method characterized in that the final end of the bus is taken into the transmission unit (1), and the transmission unit (1) is provided with a termination component (8), so that the transmission unit (1) terminates the bus. .