JPS6080334A - Reset circuit of endoscope image pickup system - Google Patents

Abstract

PURPOSE:To attain resetting of a communication system centralizingly at a fault of an endoscope image pickup system by providing a means resetting other communication means in correspondence to the detection of a communication error. CONSTITUTION:When data is transmitted from a host computer 16 to a CIU (communication interface unit) 17 and a signal representing the reception of the data is returned from the CIU17, if no signal is returned within 20ms from the data transmission due to invasion of a noise to the received signal, a computer 16 judges it as the presence of an error to reset the CIU17. That is, an error detection circuit 27 receives information of a time supervisory circuit 28b of an OS3 and a status, and when time is over, it is judged as generation of error and an error signal is outputted. This signal is inputted to a CIU reset circuit 31 via gate circuits 29, 30 to reset the CIU17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reset circuit for an endoscopic imaging system.

In an endoscopic imaging system, data communication is performed within the light source unit and between the light source unit and the endoscopic camera, and various operations are executed.

If an electric scalpel device is used in this data communication, the data communication will be disrupted and errors will occur in the data. When an error occurs in data, it is necessary to recover from the data error by retransmitting the data. This platform and transmission circuit are reset to -H.

Normally, this reset is performed by the station that detected the error itself, and a centralized reset method is not used.If the reset timing is shifted between communication stations, the reset occurs regardless of an abnormality in the other station.1. Sometimes it happens.

Therefore, an object of the present invention is to provide a reset circuit for an endoscopic imaging system that centrally resets the communication system when the endoscopic imaging system is abnormal.

Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a block circuit of the communication system of the endoscope system. According to this figure, a still camera 13, for example, is attached to the eyepiece of the endoscope 1 via an adapter 12. For example, a universal cord IJ& of an endoscope 1 to which a video camera 4 is attached is coupled to the light source device 15 to the adapter 12 .

The light source device No. 5 includes a host computer (HO8T).
A communication interface unit (CIU) 17 is installed. 'f(O8TJ
and CIUJ7 are connected by a data bus 18 and a signal line IS3. O83,5TATU
connected by 8. Camera J3 and )4 have H
Circuits 19 and 2 incorporating O8T and CIU into one chip
0 is provided for each.

In the endoscope system, light source @J5 and camera J3
Communication is carried out with and No.4.

In this case, the light source device 15 is the master station, the cameras 1.9.
14 is a slave station. When transmitting data in the light source device 15, the data is assembled according to the format shown in FIG. According to this data format, the destination address, self address, data length, and text data are N+
It consists of 3 bytes, and sum check data SMD is added after this data string. Sum check data SMD
is composed of the two's complement of the addition result (1 byte) obtained by adding N+3 bytes from the beginning to the end of the data string, ignoring carry, and becomes the N+4th byte data.

A sum check is also performed when communication is performed between the i0sT16 (of the light source device 15) and the CIUJ 7, but in this case, as shown in the flowchart of FIG. The error detection and recovery mode is executed according to the following sequence. On the other hand, when the 10ST detects a sum check error, the error detection and recovery mode is executed in the order 1→3→4.

Next, sum check error detection will be described.

In sum check error detection, the sending side, e.g.
O8TJ e is N+3 from the beginning to the end of the transmitted data
Add all the bytes, that is, the destination address, self address, data length, and text data bytes in the format shown in Figure 2, and read the two's complement of the result of this addition η' after the text data. shall be. The reception f11, that is, CIUI7, receives all the data strings' (N +
4 bytes). When the result of this addition becomes 0, it is determined that there is no error, and when it does not become 0, it is determined that an error has occurred. If it is determined that there are errors in this sum check error detection, the CIUI 7 issues a p3 sending request to ■■08T16. In this case, the retransmission request code is transmitted in the following format. In the above format, "29" is determined as the retransmission request code. When HO8T16 receives a retransmission request according to the above format, it resets CIUI2.
) If IO8TJ6 detects a sum check error, it will be sent to CT without making a retransmission request from CIUJy.
Immediately reset Uly and resend the data.

When resetting the CIUI y, it is done by hardware as shown in FIG. That is, the output of the reset circuit 2 for the entire system is connected to reset terminals R and R of the CPU 22 and PPI (parallel port interface) 23. The CPU 22 and PPIzs are connected by a data bus 24, and the output of PPI 2.9 is connected to CI
Connected to the reset terminal π of UJ7.

In the circuit shown in FIG. 4, CP is reset by reset circuit 2.
When U22 is reset, the I data bus 24 and P P I
2, 0 to reset CIUI7 via q, i.e.
C independently from the reset timing of reset circuit 2.
CI H77it is reset by PU22. Further, when an error occurs, the CIU is shut down according to the execution of the CPUzz program.

FIG. 5 shows a time chart showing reset timing. According to this time chart, when the power is turned on, the CPU 22 and PPI 2, ? is reset and set at one-shot time t of CP LJ 22. A and b in RES indicate a state in which the CIUJ7 has been arbitrarily reset by the CPU 22.

In Figure 1, when communication is carried out between HO8TJ t; and CIU7 y, the data bus (8 data lines), IS3 and O83 signal lines, and 5TAT
Communication takes place via the US line. The IS3 signal line is used for communication from HO8T16 to CIU77, whereas the O83 signal line is used from CIUJ7 to HO
Used for communication to 8T16.

When it is desired to send data from the CIU77 to the HO8T16, the HO8T16 sets the 5TATUS line to the L1 novel, and the C■■J17 transmits a pulse to the line O83 indicating that the data has been transmitted. This pulse on line O83 becomes an interrupt signal, and when HO8TJ6 receives pulse O83, it receives data from CIU Noah and transmits a signal indicating that it has received the data. On the contrary, HO8TJ6
When sending data from to CI LT 77, 5TA
TUS is set to Hl/bell. At this time, HO8TJ
When the data is set in e, a pulse is sent to the IS3 line to inform the CIU 77 that the data has been sent.In contrast, the CI and TT 77 indicate that the data has been received via the 083 line. Send pulse to HO8TJ 6. Such data transmission and reception is carried out half-two-one, that is, alternately.

When data is being transmitted and received via the data bus as described above, if noise is carried on the data bus and the data becomes erroneous data, the error can be detected by a sum check. However, if data lines TS3 and O83 are filled with extra data due to noise or disappear,
For example, if the number of data determined by the data format changes and unscheduled data is input to the data line IS3, the pulse will be input again immediately after receiving the pulse indicating "data received". Then, this pulse is input, that is, 2 tf child data is input. In such a case, the data before the sum check data SMD is processed as the sum check data SMD. In this case, a sum check error is detected by the sum check. However, at this time, on the transmitting side, one piece of data, that is, SM
If D is sand, I would like to send this SMD, but a state where it cannot be sent occurs, that is, a waiting state occurs. However, if there is a large amount of data due to noise like this, the optical sum check error (PCIU) 7 for one sheet is reset, so the data error can be recovered. On the other hand, if there is less data (7), the sending side assumes that it has sent all the data, and the receiver 11i is waiting for data. When it is waiting for reception like this, it should send additional data. If this is done, the missing received data will be filled and the reception waiting state will be released.In this case, many errors will be detected in the received data by the sum check.This additional data, which is harmless, will be collected by the polling address range specification booter. Jfl0 polling address range specification data is the address of the slave station that can be specified for polling by HO8T16, for example, when specifying slave stations numbered 2 to 5, data indicating the section and enclosure from address 2 to address 5. This means that the data is generated during polling and is harmless to the data to be sent and received.

Data was sent from HO8TJ6 to CIUJ7 @5
TATUS is Hl/Bell.

When CI U y 7 receives the data, it sequentially activates the slave stations.
IJ songs are required to transfer data to slave stations (During this period, 5TATUS is L/Bell)
10 Unable to communicate from ST76 to CIUJ7. When polling between CIUJ y and the CIU of a slave station, for example camera J4, between this j (11), if the data is incorrect, the polling will be repeated many times. In such a case, 5TATUS will be held at L level. 5
TATTJS is 7.0 in normal operation. Since the period of l/bel is about 100 mIJ seconds, S'l'ATUS
If the L level period 1" dT of is too long, for example, 500-:
If this continues for up to 1 second, the HO8T16 determines that there is an abnormality between the master station CIUJ 7 and the slave station CIU, and instructs the CIU 77 to reset, thereby avoiding a tedlock situation.

In data transmission, when the HO8T76 sends the CIUJ7 hetator, the CIU77 replies that it has received the data, but this reply may be erased by noise and no reply can be obtained.

In such a case, if there is no response within 20 milliseconds from data transmission, the HO8T16 determines that there is an abnormality in the CIU 17 and resets the LCIUJ7.

As mentioned above, if there is an abnormality in data communication, that is, the received data is error data or 5 TATU
If S remains at L level for 500 milliseconds or more, or if there is no response within 20 milliseconds after data transmission, the master station will reset the slave station. After a reset is applied, a ringing range is specified, and if there is no response, a reset is applied. In this way, the reset will be repeated many times until a response is received. When resetting is performed many times in this way, the reset is performed in a short period of time, for example, up to four times, and thereafter, the reset is performed at intervals of, for example, one second. In this way, errors caused by noise caused by lightning that occur once can be recovered quickly, and noise that occurs continuously due to the operation of an electric scalpel device, etc. can be recovered from while other tasks are being carried out. Recovery processing can be performed without affecting speed.

In FIG. 6, the above-mentioned error detection and recovery circuit is shown in hardware. According to this, data is transferred to the receiving buffer 25.
The data in the reception buffer 25 is transferred to the determination buffer 26, and an error detection circuit 27 determines whether or not there is an error in the data. A time monitoring circuit 28 of 5TATUS and O83 is connected to this error detection circuit 27, and upon receiving the information from this circuit 28, the error detection circuit 27 checks whether or not there is a delay in the received data, a time over, a re-request for the received data, etc. Determine whether there are errors in the beta data. In addition, when 5TATUS is at H level, it is transferred from HO8T to CIU, and when it is at L level, it is sent from CIU.
This indicates that the communication direction is changed from HO8T to HO8T.

If this S'I'ATUS remains at the L level for more than 50 (1 milliseconds), it is determined that an error has occurred.

Also, ) IO8T is O within 2o milliseconds of the output edge of IS3.
If 83 is not received, it is determined that an error has occurred. Furthermore, IS
3 and O83 mean "data sent" and "data received", and both are exchanged depending on the communication direction.

When the error detection circuit 27 detects an error, the counting circuit 28
and supplies a detection signal to the AND gate 29. The total V circuit 28 counts the number of error occurrences from the detection signal. The counting circuit 28 outputs a counting signal corresponding to the occurrence of four or less errors as A.
Input to ND gate 29. The AND gate 29 inputs four or less error signals to the CIU reset circuit 31 via the OR gate (SO). As a result, CIUi is preset. When the error count exceeds 4, the output of the counting circuit 28 is supplied to the timer 33 via the inverter 32.

Timers 3 and 9 operate in response to the output of counting circuit 28 via inverter 32, and generate an output drop every second.

The output signal of timer 3.9 is passed through OR gate 3o to CI
U'I upper set path 31 is energized at 1 second intervals. This causes the CIU to continue to be reset at 1 second intervals.

If no error is detected by the error detection circuit 27, that is, if there is no error in the data, the positive data is transferred to the positive data buffer 34. Counting circuit 28 is reset if there is no error.

As explained above, when the master station, HO8T, detects an error, the HOST resets the slave stations, such as the CIU, so that when an error occurs, the response between the master station and the slave stations is quick, and error recovery is fast. It can be done.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an endoscopic imaging system equipped with a reset circuit according to an embodiment of the present invention, Fig. 2 is a diagram showing the data format, and Fig. W3 is a flowchart showing the error detection and recovery process. , FIG. 4 is a circuit diagram of a circuit system for resetting the CIU, FIG. 5 is a time chart showing the operation timing of the circuit of FIG. 4, and FIG. 6 is a circuit diagram of an error detection and recovery circuit. 11... Endoscope, 12... Adapter, 13.14.
...Camera, 15...Light source device, 16...Host computer, J7...Communication interface unit. Applicant's representative Patent attorney Atsushi Tsuboi Figure 2 Figure 4 Figure 5 Continued from page 1 ■Inventor Takashi Matsui Table of Contents Patent Application No. 187958/1987 2, Title of Invention Reset Circuit for Efi Hra 'jE System 3
, Relationship with the person who overturns the amendment $I/1 Patent applicant (037) 71 Rimbus Optical Industry Co., Ltd. Kozue 4, representative m1
17 Mori Hill 6, Toranomon 1-26-5, Minato 1, Tokyo
, Sleeve EEE (1) Contents of subject specification, drawing 7, and supplementary rows 1) "
Light source device 15 - When sending 1, select [Light, #KayaJ, 1]
-'i's,l,l,p,'-,:T"1b aboveC4I
↓J17 above, I゛2 letters, when performing benevolence” and R]i
I-Rir. 2) In the fourth negative fifth line, even if it is 1, it says -1, but if it is 1, it is 4 and R] is corrected. 3) In the 6th negative 19th line to the 20th line, correct ``1 one-shot time L'' as ``after initial setting 11I'1 question''. 4) "Counting circuit 28" on the 9th line to the 10th line, the 11th line, the 12th line, and the 19th line of the same page 13
1 counting circuit 38''. 5) In the 1st line of No. 14, correct the phrase "counting circuit 28" to read "divider circuit 38." 6) In the 44th negative line to the 9th line, change the number ``-1'' to ``1-new data.''
Ru. 7) In the 14th negative 10th line, change the word 10% circuit 281 to 10th line 38. 8) Correct Figure 6 of the correction drawing as shown in the attached sheet.

Claims (1)

[Claims] (1) An error detection means for detecting a data communication error, which is provided in the inner celebration photography system and is provided in at least one of the first and second communication means that communicate with each other, and responds to the error detection by this error detection means. An 11-set circuit for an endoscopic imaging system having means for resetting the communication means.