JPS61192142A - Communication system - Google Patents

Abstract

PURPOSE:To confirm the normality of information route between a master equipment and plural slave equipments without provision of a pilot signal gener ating section and a pilot signal detecting section or the like by allowing a specific slave equipment selected and designated by bus private use permission information to make a gate means to a common bus for information return enable to return reply information. CONSTITUTION:In desiring transmission of information from a slave equipment 1, the master equipment 10 sends bus private use permission information to the slave equipment 1 via an information transmission bus 11. A transmission/ reception control section 1a of the slave equipment 1 receiving the bus private use permission information makes a gate means 1e enable. On the other hand, then an information return bus 12 is used exclusively by the slave equipment 1 and the transmission/reception control section 1a of the slave equipment 1 transmits information to the master equipment 10 via the bus 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication system that includes a plurality of slave devices and one master device that controls these slave devices.

[Conventional technology]

Conventionally, in this woodcutter's communication system, a dedicated information return route was established between multiple slave devices and a master device for information transmission, or the information return route was made multiple and each slave device communicated with the master device. A timing circuit is provided to create the return timing based on the reference clock from the device, and time-sharing use of the information return route is assigned to multiple slave devices to perform information transmission. Here, see Figure 2. A conventional example will be explained below. In the figure, 1 to m are slave devices, 10 is a master device that controls these slave devices, 10a is a part of the transmitting and receiving side that controls the transmission and reception of the master device IO, and la to m
a is a transmission/reception control unit that controls transmission and reception of the valley slave device;
11 is the information transmission route from the master device 10 to the master device (transmission bus Lld-md is the information return route from each slave device to the master device 10, lb-mb is the information return route) 1d-md normality. Pilot signal generation part for confirmation % lc-mc is pilot signal insertion part, IOC is multiple information return routes l, d - m d
a reception selector unit that selects one piece of information from
0b is a detection unit for the pilot signal sent to the information response route. Slave device 1-m to master device 10
The transmission of information to the transmission/reception control unit 1axma is performed via each information return route ld-md, and the reception selector unit 10c of the master device 10 selects information on one information return route, and the transmission/reception control unit 10a receives. Information return route) Pilot signal generators 1b-mb are installed in each slave device to confirm the normality of 1d-md.
and a pyro, a pyro that inserts a signal into the information return route,
A pilot signal insertion section 1cmmc is provided, and the pilot signal detection section 10b of the master device 10 detects the inserted pilot signal.

[Problem that the invention seeks to solve]

However, in such a communication system, the number of information return routes increases in proportion to the increase in the number of slave devices, and the master device requires a selection unit that selects a plurality of return routes. Further, each slave device requires a pilot signal generation section and an insertion section, and the master device requires a pilot signal detection section.

Therefore, the communication system configuration becomes complicated.

- There is also a conventional example of duplicating the information return route, but in this case, the valley slave device requires a timing circuit for time-division use of the common information return route, and a pilot signal generator and inserter similar to the above. In addition, the master device requires a pilot signal detection section. Therefore, the configuration of the communication system becomes complicated.

[Means for solving problems]

The present invention provides a communication system including a plurality of slave devices and one master device that separates these slave devices, wherein a first common bus (information transmission bus) transmits information from the master device to the plurality of slave devices. and a second common bus (information return bus) for transmitting information from the plurality of slave devices to the master device, and the master device sequentially selects the plurality of slave devices via the first common bus. bus-dedicated permission information for the second common bus is sent out, and the specific slave device selected and designated by the bus-dedicated permission information enables gate means for the second common bus and returns response information. , the normality of the first and second common buses is confirmed. [Example] Next, in Figure 2, an example of the present invention will be explained with reference to the drawings. The difference in the described configuration from the conventional example is that the reception selector section in the master device and the
, g signal detection section, pyro, g signal generation section and pyro, g signal insertion section in each slave device are not required, while gate means 1e-me is provided in each slave device, and the master signal is transmitted from multiple slave devices. The reason for this is that the information return route to the device is duplicated and becomes a common bus.

For example, if you want to transmit information from a slave device l,
The master device 10 sends bus exclusive permission TFT information to the slave device 1 via the information transmission bus 11. Transmission/reception control unit 1 of slave device 1 that received this bus exclusive permission information
a enables the gating means 1e. - Katana and other slave devices have gate means disabled, so iW report return bus 12tj Nislep device 1
The transmission/reception control unit 1a of the slave device l can transmit information to the master device 10 via the bus 12. After a certain period of time, the master device IO
The bus exclusive release information is sent to the slave device 1, and the transmission/reception control unit ia of the slave device 1 releases the enable of the gate means 1e.If this process is performed for all slave devices, all the slave devices will be sequentially processed. Information can be transmitted. At this point, the master device 10 periodically sends bus exclusive permission information and bus exclusive release information to each slave device, and each slave device always returns response information to the master device 10 indicating that it has received this information. By doing so, each slave device can receive the above information within a certain period, so that the normality of the transmission bus 11 can be confirmed, and the master device 10 can receive response information from each slave device. The normality of the sending bus 11 and return bus 12 can be confirmed.

〔Effect of the invention〕

As explained above, according to the present invention, the information return route can be made multiple by simply providing a gate means in each slave device, that is, it can be configured by a common bus, and a pilot signal generator, a pilot signal detector, etc. can be provided. It is possible to check the normality of the information route between the master device and multiple slave devices. Therefore, the configuration of the communication system can be extremely simplified.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional example. 1-m...Slave device, 10...Master device, lexme...Gate means, 11
...Information transmission bus (first common bus), 12...
...Information return bus (second common bus) 0 //-One agent: Susumu Uchihara, patent attorney. Figure 2

Claims (1)

[Claims] Multiple slave devices and 1 to control these slave devices
a first common bus that transmits information from the master device to the plurality of slave devices; and a second common bus that transmits information from the plurality of slave devices to the master device. wherein the master device selectively sends bus-dedicated permission information of the second common bus to the plurality of slave devices via the first common bus, and the master device selectively sends bus-dedicated permission information of the second common bus to the plurality of slave devices via the first common bus, and The communication system is characterized in that the specific slave device enables gate means for the second common bus and returns response information to confirm the normality of the first and second common buses.