JP2884814B2 - Signal relay method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal relay system for transmitting signals by relaying a plurality of repeaters between a master unit and a plurality of terminals.

[0002]

2. Description of the Related Art Conventionally, most signal transmission systems in homes and offices use a single transmission medium (wired, radio wave, infrared, etc.).

[0003] In addition, there is one using a plurality of transmission media. For example, as shown in FIG.
There is a system in which wired transmission is performed to transmission path C through transmission line 3 using a transmission signal of the signal format shown in FIG. 5, and optical wireless transmission is performed from relays 2A to 2C to terminals 4A to 4F using optical signals.

In FIG. 3, a hatched portion indicates an area for receiving optical signals from a plurality of repeaters (an area where signals can be transmitted to a plurality of repeaters).

[0005]

However, in such a system, for example, the terminal 4C receives signals from the two repeaters 2A and 2B, and thus interferes with each other. As shown, the repeaters 2A, 2B
There has been a problem that the reception pulse width at the terminal 4C changes due to a time lag due to the signal conversion in the above, and data cannot be transmitted accurately.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a signal which can transmit data accurately even when there is an area for receiving optical signals from a plurality of repeaters. It is to provide a relay system.

[0007]

Means for Solving the Problems The present invention is to signal transmission relay between master unit and a plurality of terminal unit a plurality of repeaters, between repeaters and terminal unit is to perform the optical wireless transmission, the parent Container
Start bit, terminal address, data
Signal format according to the signal format composed of
In the signal relaying scheme to perform transmission, in the signal format, in succession an address of the terminal device of the destination following the start bit included twice, in each repeater, the terminal instrument to be transmitted Set the address in advance,
Compare the address of the first terminal included in the transmission signal from the master with the address of the terminal set in the repeater
The transmission signal is sent to the terminal only when the values match.

[0008]

In the signal relay system of the present invention, a signal is transmitted by relaying between a master unit and a plurality of terminal units by a plurality of repeaters, and optical wireless transmission is performed between the repeater and the terminal unit . Parent device
Start bit, terminal address, data
Signal format according to the signal format composed of
In the signal relaying scheme to perform transmission, in the signal format, in succession an address of the terminal device of the destination following the start bit is included twice, in each repeater, pre-assigned terminal The address of the device is the parent device
Only when the address of the first terminal included in these transmission signals matches the address of the first terminal, the subsequent signals are transmitted to the terminal.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a signal format and a signal waveform of a transmission signal when an embodiment of the present invention is applied to the system shown in FIG. 3, and FIG. 2 is a block diagram showing a repeater. It is.

In the present invention, each of the repeaters 2A to 2A
Each terminal is assigned to C. That is, for example, the terminals 4A and 4B are assigned to the repeater 2A, the terminals 4C and 4D are assigned to the repeater 2B, and the terminal 4 is assigned to the repeater 2C.
E and 4F are allocated.

According to the present invention, in the signal format of the transmission signal from the parent device 1 shown in FIG.
As shown in (2), the address of the terminal to be transmitted, which is set following the start bit for determining the start of the signal, is set to 2
It is set consecutively.

After that, a reply band indicating a period for receiving the data to be transmitted and the reply data from the terminal device follows, and these constitute a signal format.

The repeaters 2A to 2C are, as shown in FIG. 2, a line receiver 21a for receiving a signal from the transmission line 3, and a line driver 21 for sending a signal to the transmission line 3.
b, gate 2 for output from line receiver 21a
2a, gate 22 for input of line driver 21b
b, an optical transmission circuit 23a for converting a signal passing through the gate 22a to an optical signal and transmitting the signal to a terminal, an optical receiving circuit 23b for receiving an optical signal from the terminal and converting the signal to an electric signal, and an output signal of the optical receiving circuit 23b Waveform shaping circuit 24, which shapes the waveform of the waveform and outputs it to gate 22b, gate 22a and gate 22b
A gate control circuit 25 for controlling the opening and closing of the terminal, a terminal address memory 26 for storing the assigned terminal address, a setting switch 27 for setting the terminal address in the terminal address memory 26, and an optical transmission circuit 23a. Generating circuit 2 for generating a carrier for generating an optical signal
8.

Next, the operation of this embodiment will be described. When all the repeaters 2A to 2C receive the start bit of the transmission signal from the master 1, the gate 22a is opened by the control signal from the gate control circuit 25, and the start bit is converted into an optical signal from the optical transmission circuit 23a. Send to.

Next, the repeaters 2A to 2C receive the first terminal address. Now, assuming that the address of the terminal 4C is set as the terminal address in the signal format, the repeater 2A receiving the first terminal address
2C compares the address with a value in a terminal address memory 26 storing a pre-assigned terminal address, and as shown in FIG. 1D, the terminal 4C Only the repeater 2B set to 26 opens the gate 22a again.

Then, while the gate 22a of the repeater 2B is open, the second terminal address and data pass through the gate 22a and are transmitted from the optical transmission circuit 23a to the terminal as an optical signal.

That is, the start bit of the transmission signal from the base unit 1 and the first terminal address become new start bits for the terminal.

Here, only the repeater 2B corresponding to the terminal address performs an optical transmission operation to the terminal, so that one terminal receives optical signals from a plurality of repeaters. No reception error occurs due to the interference between the optical signals.

Next, the optical signal from the repeater 2B is
C and the terminal 4D receive a reply signal from the terminal 4C whose address matches.

The return signal from the terminal 4C is transmitted to the repeater 2A.
1B. In the repeater, only the repeater 2B that has transmitted the light to the terminal 4C by the control signal from the gate control circuit 25 replies as shown in FIG. The gate 22b is opened in the band, and no signal interference occurs even in the optical reception in the repeater, and normal return data is finally sent to the master 1 as shown in FIG. Will be sent.

In this embodiment, the start bit of the transmission signal from the master unit 1 and the first terminal address are newly set as start bits for the terminal unit, so that the start bit length is substantially increased. Become.

Therefore, conventionally, in the system of FIG.
When the signal format as shown in FIG. 5 is used as the transmission signal, the terminal of the optical wireless transmission needs a longer start bit length in order to secure reliability as compared with the case of the wired transmission. When the terminal device is battery-operated, the operation is performed only at the time of signal reception in order to reduce power consumption. Therefore, it is necessary to use the start bit as an interrupt signal and then confirm the start bit. However, according to the present embodiment, these problems can be solved.

[0024]

As described above, according to the signal relay system of the present invention, a signal is transmitted by relaying a signal between a master unit and a plurality of terminals by a plurality of repeaters, and optical wireless communication is performed between the repeater and the terminals. Start transmission between the master unit and the repeater,
Signal format consisting of device address, data, and reply band
In the signal relaying scheme to perform signal transmission by the mat, in the signal format, in succession an address of the destination terminal device following the start bit is included twice, in each repeater, preassigned The first terminal in which the address of the given terminal is included in the transmission signal from the parent device
Only when it matches the address of the terminal, the subsequent signals are sent to the terminal, so even if there is an area to receive optical signals from multiple repeaters,
Together enable accurate data transmission, since a new terminal dexterity start bit of the address of the start bit and the first terminal device of the transmission signal from the main unit, a signal which can be lengthened substantially start bit length The relay system could be provided.

[Brief description of the drawings]

FIG. 1 is a signal format and a signal waveform diagram of a transmission signal according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a repeater according to the above.

FIG. 3 is a configuration diagram showing an entire system according to the same.

FIG. 4 is a signal waveform diagram according to a conventional example.

FIG. 5 is a signal format according to the above.

[Explanation of symbols]

 Reference Signs List 1 master unit 2A repeater 2B repeater 2C repeater 3 transmission line 4A terminal 4B terminal 4C terminal 4D terminal 4E terminal 4F terminal 21a line receiver 21b line driver 22a gate 22b gate 23a optical transmission circuit 23b optical reception Circuit 24 Waveform shaping circuit 25 Gate control circuit 26 Terminal address memory 27 Setting SW 28 Carrier generation circuit

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI H04B 10/22 H04L 12/28 (56) References JP-A-2-109439 (JP, A) JP-A-2-60252 (JP) JP-A-2-223249 (JP, A) JP-A-4-192737 (JP, A) Matsushita Electric Works Technical Report No. 42, Apr. 1991, Yoshiharu Ito et al. "Nice Remote Control Series", pages. 9-13 19th Annual Conference of the Institute of Electrical Engineers of Japan Vol. 10th, 1992, E-9, Toshiaki Tokimi, et al. "Development of a full 2-wire remote control wireless address setting device", pages. 143-144 (58) Fields investigated (Int. Cl. ⁶ , DB name) H04L 12 / 46 H04L 12/28 JICST file (JOIS)

Claims (1)

(57) [Claims] A signal is relayed between a master and a plurality of terminals by a plurality of repeaters to transmit a signal, and optical wireless transmission is performed between the repeater and the terminal, and a start bit is provided between the master and the repeater.
Signal consisting of address, terminal address, data and reply band
In the signal relaying scheme to perform signal transmission by the format, in the signal format, following the start bit consecutive address of the destination terminal device included twice, in each repeater, to be transmitted The address of the terminal is set in advance, and only when the address of the first terminal included in the transmission signal from the master is compared with the address of the terminal set in the repeater and matches, the aforementioned A signal relay system for transmitting a transmission signal to a terminal.