JPH02143619A - Optical transmission/reception circuit with test function - Google Patents

Abstract

PURPOSE:To instantly and easily judge the occurrence of an abnormality of a transmitter or a receiver by generating a 1st or a 2nd frequency test signal from a test signal generating means, detecting a test signal and displaying the normal state. CONSTITUTION:A test signal generating circuit 2 outputs a test signal in a frequency f1 periodically during the normal state of a transmitter and a transmission circuit 3 modulates the transmission signal. Part of an infrared ray signal outputted from a light emitting element 4 is received by a photodetector 5 by using the transmission signal and its output signal is detected by a test signal discrimination circuit 7 via a detection circuit 6 to blink an indicator 8. Thus, the normal operation of the transmitter 1 is confirmed. A receiver 10 similarly receives the test signal to blink a display device 9 thereby confirming the normal operation. If the display device 9 is not blinked normally, the test signal in a frequency f2 is outputted to decide in which of the transmitter 1 and the receiver 10 the cause resides and the cause is easily decided by the display of the display device 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical transceiver circuit, and more particularly to an optical transceiver circuit with a test function.

[Conventional technology]

Conventionally, this type of optical transmitter/receiver circuit has a status display for checking the output, either in front of the light emitting element on the transmitter side or at the output stage of the light receiving element on the receiver side. I was checking to see if there was.

[Problem to be solved by the invention]

The above-mentioned conventional optical transmitter/receiver circuit with test function uses a status indicator to check whether there is a failure or not, so it is necessary to check whether invisible infrared rays, etc. are actually being output by checking between the transmitter and the receiver. The problem is that it is difficult to easily determine whether a fault condition is occurring from the transmitter side or the receiver side.

[Means to solve the problem]

The optical transmitter/receiver circuit with a test function of the present invention includes, on the transmitter side, a test signal generating means that periodically generates a test signal having a first frequency to modulate the transmitted signal, and a test signal that is converted from the transmitted signal. comprising a test signal discriminating means for inputting a part of the optical signal and detecting the test signal, and a display means for receiving a detection output of the test signal discriminating means and displaying that the transmitter is in a normal state; A test signal generating means for generating a test signal having a second frequency and converting it into an optical signal on the receiver side, and inputting the optical signal or the optical signal from the transmitter side, converting it into a reception signal, and receiving A test signal discriminator for detecting a test signal of the second frequency or the first frequency from within the signal, and an indication that at least one of the transmitter or the receiver is in a normal state upon receiving the detection output of the test signal discriminator. It has a display means.

(Operation) During the transmission of the optical signal, the transmitter uses the test signal generation means to periodically generate a test signal having the first frequency to modulate the transmission signal. However, a portion of the optical signal is demodulated by the test signal discrimination means inside the transmitter, and the test signal is detected from the demodulated signal, thereby determining that the transmitter is operating normally. On the other hand, on the receiver side, the test signal discriminating means demodulates the input optical signal and detects the test signal from it, so that the operation of the receiver is similarly controlled. It can be determined that the condition is normal, and the display means will indicate that fact.If the receiver's display means does not display a normal state, the receiver Generating a test signal having a second frequency from the test signal generating means on the side and inputting it;
By detecting the presence or absence of the test signal by the test signal discrimination means, it is possible to confirm whether there is an abnormality on the receiver side.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of an optical transceiver circuit with a test function according to the present invention.

The transmitter 1 sends a signal (a transmission signal is generated by the Z circuit 3,
The light emitting element 4 converts it into an infrared signal and transmits it. The test signal generation circuit 2 periodically generates a test signal having a frequency of fl [Hz], and modulates the transmission signal output from the transmission circuit 3/Jt. The light receiving element 5 inputs a part of the infrared signal output from the light emitting element 4 and converts it back into an electrical signal, and the detection circuit 6 detects this electrical signal. When the test signal discrimination circuit 7 receives the test signal of the frequency f1 [11z] detected by the detection circuit 6, it causes the transmission status indicator 8 to blink.

In the receiver 10, the light receiving element 14 receives the infrared signal from the transmitter 1511. Further, the test signal generation circuit 11 generates a test signal with a frequency of f2 [tlZ], and transmits the test signal to the transmission circuit 1.
The light emitting element 13 converts this test signal into an infrared signal and inputs it to the light receiving element 14. The light receiving element 14 converts these infrared rays 3 into electrical signals, and the detection circuit 15 detects them. Test signal discrimination circuit 16
When the test signal of frequency f1 or f2 detected by the detection circuit 15 is input, the reception status display 9 blinks.

Next, the operation of this embodiment will be explained.

During normal operation of the transmitter 1, a test signal of frequency f1 is periodically output from the test generation circuit 1, and the test signal discrimination circuit 7 detects this test signal through the path described above and displays the transmission status. The normal operation of the transmitter R1 can be confirmed by the flashing of the transmitter 8. Similarly, when the receiver 10 receives this test signal and the reception status display 9 blinks, the normal operation of the receiver 10 can be confirmed. Next, if the reception status display 9 does not blink normally, the cause is the transmitter 1. In order to determine in which part of the receiver 10 the test signal is located, the test signal generating circuit 11 outputs a test signal of frequency f2 [lIZ]. If the receiver 10 is normal, the test signal discriminating circuit 16 detects this test signal through the above-mentioned path and blinks the reception status display 9, so it is easy to determine whether there is an abnormality in the receiver 10. Can be done.

(Effects of the Invention) As explained above, the present invention generates a test signal having the first or second frequency using the test signal generation means of the transmitter and the receiver, and uses the test signal discrimination means to generate the test signal. By displaying the normal state on the display means when the test signal is detected, it is possible to immediately and easily determine when an abnormal state occurs in the transmitter or receiver.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of an optical transceiver circuit with a test function according to the present invention. DESCRIPTION OF SYMBOLS 1... Transmitter, 2.11... Test signal generation circuit, 3.12... Transmission circuit, 4.13... Light emitting element, 5.14... Light receiving element, 6.15... - Detection circuit, 7.16... Test signal discrimination circuit, 8... Transmission status indicator, 9... Reception status indicator, 10... Receiver.

Claims (1)

[Claims] 1. In an optical transmitter/receiver circuit that transmits optical signals between a light emitting element on the transmitter side and a light receiving element on the receiver side, a test signal having a first frequency is periodically transmitted to the transmitter side. test signal generating means for generating a signal to modulate the transmitted signal; test signal determining means for receiving a portion of the optical signal converted from the transmitting signal and detecting the test signal; and detection of the test signal determining means. It has a display means for receiving the output and displaying that the transmitter is in a normal state, and on the receiver side, a test signal generating means for generating a test signal having a second frequency and converting it into an optical signal; a test signal discriminating means for inputting an optical signal or an optical signal from a transmitter side, converting it into a received signal, and detecting a test signal of a second frequency or the first frequency from the received signal; 1. An optical transmitter/receiver circuit with a test function, comprising display means for receiving a detection output and displaying that at least one of the transmitter and the receiver is in a normal state.