JP2010098582A - Output stop control circuit and communication apparatus, and output stop control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an output stop control circuit that facilitates simplifying unconsidered signal output suppression control during a transient period such as removal of a card, and to provide a method therefor. <P>SOLUTION: A communication apparatus includes a plurality of cards (A, B, C), which are removably mounted, transfers an inter-card signal from one side to another side among the plurality of cards and outputs an apparatus output signal from a card at another-side end. In the communication apparatus, an output stop control circuit (10) is provided for the card C at the other-side end from which the apparatus output signal is output, and the output stop control circuit (10) controls output stop of the apparatus output signal on the basis of results detecting presence of at least one card signal from the neighboring card B. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an output stop control technique, and more particularly to an output stop control circuit and method suitable for application to a communication device.

  An output stop control circuit in a communication apparatus or the like will be described below with reference to FIG. FIG. 7 shows a typical configuration example of the output stop control circuit used in the communication apparatus. The communication apparatus includes cards (also referred to as “packages”) A, B, and C that can be inserted and removed, and each of the cards A, B, and C includes an output stop control circuit 20. The card A receives an in-device signal and an output control signal which are input from another device (not shown) and subjected to predetermined processing (separation, signal conversion, line setting, etc.) in the communication device. Outputs the interval signal and the output control signal. The card B receives the inter-card signal and the output control signal from the card A, outputs a necessary signal to the card C as an inter-card signal, and further outputs an output control signal. The card C receives the inter-card signal and the output control signal from the card B, and outputs a device output signal to, for example, a counter device (not shown). The card C receives a device input signal from a counter device (not shown) and outputs an inter-card signal to the card B. The card B receives an inter-card signal from the card C and outputs a necessary signal to the card A as an inter-card signal. The card A receives an inter-card signal from the card B, outputs an in-device signal, undergoes predetermined processing in the communication device, and is transmitted and output to another device as necessary. The output stop control circuit 20 for each of the cards A, B, and C outputs an inter-card signal to the subsequent card or an apparatus output signal to the opposite device based on the value of the output control signal input from the previous card. Control the stop of the. Although not particularly limited, in the example of FIG. 7, cards A, B, and C correspond to an in-device control unit, an in-device function unit such as multiplexing, and a transmission unit in the communication device, and the in-device signal is a parallel signal. It is said.

  In the communication system, in the transitional period (time) from the start-up (power-up) of the communication device on the transmission side, card insertion / extraction, etc., until the required signal is output from the device and can be operated normally, It is necessary to take measures to suppress the output of unnecessary signals in response to a request from a user (customer).

  Whether the cause of malfunction or alarm detection in the communication device on the receiving side (communication device that receives the device output signal in FIG. 7) is due to an abnormal state such as a transmission line failure or the transmission line is normal but transmitted It is difficult for the receiving side communication device to identify whether it is due to the operation of starting the device on the receiving side. For this reason, in a controllable normal state, the device output signal is stopped at the time of card insertion / extraction of the device on the transmission side, etc., in order to prevent malfunction or alarm detection in the device on the reception side.

  In the example of FIG. 7, the output stop control circuit of the card A stops the output of the card A based on the detection result that the normal output of the card A itself is possible and the output control signal input as the in-device signal. And a control is performed so that the card A itself does not output an inadvertent signal during a transitional period until the required signal is output from the card A and normal operation becomes possible. Further, the fact that the normal output of the card A is possible is transmitted to the card B as an output control signal. Similarly to the card A, the card B controls the stop of the output of the signal transmitted to the card C. The output stop control circuit 20 of the card C controls the output stop of the device output signal of the card C based on the detection result that the card C itself can output normally and the output control signal input from the card B. Thus, the card C itself is controlled so as not to output an inadvertent signal during a transitional period until a required signal is output from the apparatus and normal operation becomes possible.

  In Patent Document 1, as a configuration for simplifying the diagnosis circuit of the in-station device package and facilitating the identification of the failure package, a diagnosis bit is assigned to the package and assigned when passing through each package. A configuration is disclosed in which diagnostic information is added to the received bit, the diagnostic bit is checked by a check circuit in the final stage, and the fault package is specified. In Patent Document 2, a pseudo signal generation circuit generates a pseudo signal from a basic signal input disconnection to a basic signal input recovery time to a circuit connected to a power source and inputs the basic signal, and supplies the pseudo signal to the circuit. A configuration including an output stop circuit for stopping the output of the circuit is disclosed.

JP 2001-186218 A Japanese Patent Laid-Open No. 08-036432

  The analysis according to the invention is given below.

  In the case of the configuration of FIG. 7, the output stop control circuit 20 is provided for every card in the device that affects the device output signal (that is, a card that is directly or indirectly connected to the device output signal by signal conduction or the like). There is a need.

  In each card, the function of the output stop control circuit detects that the card can output the required signal, controls the output based on the detection result and the output control signal from the adjacent card, and Therefore, complicated control such as stopping the output of the transmission signal is required.

  In addition, since the output control of the card C that directly outputs the device output signal requires the control by the output control signal from the cards A and B, the output control signal needs to be connected between the cards.

  As described above, since the control is large over the entire apparatus, there may be cases where additional customer requests or the like cannot be easily met.

  In Patent Document 1, since the diagnostic bit is checked by the check circuit of the termination package, it is necessary to provide a generation circuit in each stage of the package. Further, in Patent Document 2, a pseudo signal is generated and a circuit output is stopped when a basic input signal disconnection is detected. The inventions described in these documents are completely different from the present invention described later.

  An object of the present invention is to provide an output stop control circuit, a communication device, and an output stop control method that can facilitate and simplify the control of inadvertent signal output suppression during a transitional period such as card insertion and removal. There is.

  According to the present invention, a plurality of cards that are detachably mounted are provided, and inter-card signals are sequentially transferred from one side to the other side between the plurality of cards, and device output signals are output from the cards at the other end. An output stop control circuit mounted on a communication device that is disposed on a card at the other end that outputs the device output signal, and an inter-card signal from a card adjacent to the card at the other end An output stop control circuit for controlling output stop of the device output signal is provided based on the detection result of the presence or absence.

According to the present invention, it is provided with a plurality of cards that are detachably mounted, and the inter-card signals are sequentially transferred from one side to the other side between the plurality of cards, and the device output signal is sent from the card at the other end. An output stop control method for a communication device to output,
The card at the other end that outputs the device output signal controls output stop of the device output signal based on the detection result of at least one inter-card signal of the inter-card signal from the adjacent card. A stop control method is provided.

  According to the present invention, it is possible to facilitate and simplify unintentional signal output suppression control during a transitional period such as card insertion and removal.

  Embodiments of the present invention will be described below. As described above, in the communication device, the cause of the device on the transmission side is also a transitional period from when the device on the transmission side is started up or when the card is inserted / removed until the required signal is output from the device and normal operation becomes possible. Therefore, since the opposite device that receives the required signal does not cause a malfunction or alarm, a countermeasure may be required to prevent an inadvertent signal from being output from the transmission-side device. This countermeasure is necessary because there is an operation time until various controls in the transmission apparatus and each operation in the apparatus are in a normal operation state. Below, the example which applied this invention to this communication apparatus is demonstrated.

  In one form of this invention, it is provided with the some card | curd (A, B, C) detachably mounted in a communication apparatus, a signal between cards is transferred from one side to the other side between several cards, and the other side A device output signal is output from the end card C. In the present invention, only the card C is provided with the output stop control circuit (10). The output stop control circuit (10) outputs an output stop control signal for controlling output stop of the device output signal based on the detection result of the presence or absence of at least one inter-card signal of the inter-card signals from the adjacent (previous) card B. An internal signal generation circuit for generating is provided.

  In one embodiment of the present invention, the internal signal generation circuit has a signal presence / absence detection circuit (101) for detecting the presence / absence of an inter-card signal, and the detection result of the signal presence / absence detection circuit (101) has changed from no signal to presence of a signal. The timer circuit (102) that starts timing sometimes and outputs a predetermined logical value during the timing operation until the time-out, and the output value of the timer circuit (102) does not indicate that the timing operation is in progress, and there is a signal When the detection result of the detection circuit (101) indicates that there is a signal, the output stop control signal is set to a value that enables output of the device output signal, and the value of the output of the timer circuit (102) is being timed. When there is a signal detected by the signal presence / absence detection circuit (101) or no signal is detected, the logic circuit (103) sets the output stop control signal to a value for stopping the device output signal. It is equipped with a. In the present invention, when the signal presence / absence detection circuit (101) detects a change from the presence of the inter-card signal to the absence of the inter-card signal, the signal presence / absence detection circuit (101) displays the detection result when the state of no inter-card signal continues for a predetermined period. No signal during Hereinafter, description will be given in accordance with specific examples.

  FIG. 1 is a diagram showing a configuration of an embodiment of the present invention. The card A is input from another device (not shown) and is subjected to predetermined processing (separation, signal conversion, line setting, etc.) in another card or the like in the communication device (a card (not shown upstream of the card A)). Is received, and an inter-card signal is output to the card B. The card B receives an inter-card signal from the card A and outputs a necessary signal to the card C as an inter-card signal. The card C receives an inter-card signal from the card B, outputs, for example, a device output signal to a counter device (not shown), receives a device input signal from the counter device (not shown), and is necessary for the card B. The signal is output as a signal between cards. The card B receives an inter-card signal from the card C and outputs a necessary signal to the card A as an inter-card signal. The card A receives an inter-card signal from the card B, outputs an in-device signal, undergoes predetermined processing in the communication device, and is transmitted from the communication device to another device (not shown) as necessary. The

  In FIG. 1, the output stop control circuit 10 is provided only in the card C that directly outputs the device output signal, and the output stop control of the device output signal is performed. In the present embodiment, it is not necessary to provide an output stop control circuit for the other cards A and B when realizing output stop control of the device output signal.

  Although not particularly limited, the cards A, B, and C correspond to, for example, an in-device control unit, an in-device function unit such as multiplexing, and a transmission unit in a communication device. The cards A, B, and C are detachably mounted on the communication device, and are configured with a rack on which about several tens of cards are mounted according to a plurality of lines accommodated. Each card is supplied with power, grounding, various signals, and the like, and sends necessary signals to adjacent cards as inter-card signals. Although not particularly limited, in this embodiment, the in-device signal from the card C is a serial signal output.

  FIG. 2 is a diagram showing a configuration of an internal signal generation circuit that is provided in the output stop control circuit 10 of FIG. 1 and controls output signal stop. Referring to FIG. 2, the internal signal generation circuit receives the inter-card signal 104, detects the presence / absence of a signal, outputs a required logic according to the detection state, and the signal presence / absence detection circuit 101. Input the output signal 105, set and measure a transitional time from when the logic of the output signal 105 changes until the required signal is output from the device and can be operated normally. Only, a timer circuit 102 that outputs a required logic, an AND circuit 103 that inputs an output signal 105 of the signal presence / absence detection circuit 101 and an output signal 106 of the timer circuit 102, and outputs an output stop control signal 107. I have. The output stop control signal 107 output from the internal signal generation circuit controls output of the device output signal in the output stop control circuit 10. Although not particularly limited, the timer circuit 102 starts the time counting operation only when the output signal 105 of the signal presence / absence detection circuit 101 changes from logic 0 (no signal) to logic 1, and the output signal 105 of the signal presence / absence detection circuit 101. Is changed from logic 1 (with signal) to logic 0 (without signal), and when the value of the output signal 105 of the signal presence / absence detection circuit 101 is a fixed value, the timing is not started and the current state is changed. Shall be retained.

  The signal presence / absence detection circuit 101 changes the output signal 105 from logic 1 to logic 0 when the no-signal state continues for a predetermined time (t1) from the time when the signal of the inter-card signal 104 is detected to detect no signal. To do. The inter-card signal 104 is one of a plurality of inter-card signals input in parallel from the card B to the card C. As the inter-card signal, an apparatus output information signal, a signal used for monitoring or control, and the like are used. Of these, the inter-card signal 104 input to the signal presence / absence detection circuit 101 includes a clock signal, etc. A signal that toggles in each cycle is used.

  When the output signal 105 of the signal presence / absence detection circuit 101 changes from logic 0 (no signal) to logic 1 (signal present), the timer circuit 102 starts counting, and during that time, the timer circuit 102 sets logic 0 as the output signal 106. During this period, the output stop control signal 107 output from the logical product (AND) circuit 103 is set to logic 0, and the output stop control circuit 10 stops the output of the device output signal. When a time-out occurs in the timer circuit 102, the output signal 106 of the timer circuit 102 becomes logic 1, and when the output signal 105 of the signal presence / absence detection circuit 101 is logic 1 (signal present), it is output from the AND circuit 103. The output stop control signal 107 is set to logic 1, and the output stop control circuit 10 cancels the output stop of the device output signal (can be output). Although not particularly limited, in the output stop control circuit 10, output stop control is realized by taking the logical product of the device output signal and the output stop control signal 107.

  3 to 6 are time charts for explaining an example of the operation of the card C when the internal signal generation circuit of FIG. 2 is applied to the configuration example of the output stop control circuit of FIG. Timing operations when the card C is removed and inserted are shown. 3 to 6, the inter-card signal corresponds to 104 in FIG. 2, the signal presence / absence detection circuit output corresponds to 105 in FIG. 2, the timer circuit output corresponds to 106 in FIG. 2, and the output stop control signal corresponds to 107 in FIG. Yes. For each signal, logic 1 is shown as “H” (High level) and logic 0 is shown as “L” (Low level).

  When a card (not shown) on the device side (upstream) further than card A or card A is inserted or removed, the presence or absence of an inter-card signal of card C occurs through card B or card A. The operation is the same as that of time. There are various conditions during the transition period related to starting and stopping of the target device, such as startup of the device and power on / off of the card. However, since transient condition changes when limited to the card C that directly outputs the device output signal are aggregated in the condition changes shown in FIGS. 3 to 6, it is sufficient to consider them.

  FIG. 3 shows an operation example when the card B is removed from the apparatus. When the card B is removed, there is no inter-card signal input to the card C, so the signal presence / absence detection circuit output has a logic indicating no inter-card signal. The signal presence / absence detection circuit 101 determines that there is no signal when the state of no signal continues for t1 time, and the signal presence / absence detection circuit output changes from “H” to “L”. At this time, since the timer circuit 103 that operates by a logic change to a signal present state does not operate, the logic change of the timer circuit output is not performed. In this example, “H” is fixed.

  The output stop control signal determined by the logical product of the signal presence / absence detection circuit output and the timer circuit output changes from the device output signal enabled logic to the device output signal stop logic when the signal presence / absence detection circuit output logic changes. To do. That is, when the state of no signal continues for t1 time, it is determined that there is no signal, the signal presence / absence detection circuit output changes from “H” to “L”, and the output stop control circuit of FIG. Control is performed to stop the device output signal after time t1 from the removal of the device.

  t1 is a time for determining whether there is no inter-card signal in the signal presence / absence detection circuit 101, and is a time that can be arbitrarily set by a target signal. Although not particularly limited, the applied time setting of t1 is, for example, about several clock cycles, and is set to several ns (nanoseconds).

  FIG. 4 shows an operation example when the card B is inserted into the apparatus. When the card B is inserted, in the signal presence / absence detection circuit 101 (FIG. 2) of the card C, the inter-card signal 104 to be input is present. (In this example, when a signal is detected, change from “L” to “H”).

  In this embodiment, the operation is performed in synchronization with the falling edge of the inter-card signal. The timer circuit 102 operates when the signal presence / absence detection circuit output changes logically from the absence of a signal to the presence of a signal. As shown in FIG. 4, the timer circuit output changes to “L” for t2 time from the time when the inter-card signal is changed to no. During the period t2, the output stop control signal determined by the logical product of the signal presence / absence detection circuit output and the timer circuit output is the logic without the inter-card signal or the logic with the timer operation, and the logic of the device output signal stop (“L”). "), And after t2 time has elapsed, the timer circuit output becomes" H "and the signal presence / absence detection circuit output is also" H ", so that the device output signal is possible logic (" H "). The output stop control signal controls the output stop control circuit of the card C in FIG. 1, and even if the card B is inserted, the output stop of the device output signal is continued for the time t2.

t2 is set to an arbitrary value as a transitional time until a required signal is output from the apparatus and normal operation becomes possible. As an example, the time setting of t2 to be applied is assumed to be several seconds with the time required for all the software controls to rise. Therefore, t1 (several nanoseconds) is a sufficiently small value about 1 × 10 ^{−9 as} compared with t2.

  FIG. 5 shows an operation example when the card C is removed from the apparatus. The solid line portion in FIG. 5 shows an example of an operation in a transition period in which the power supply of the card C is not immediately cut off even if the card C is removed due to power supply charge or the like (the power supply voltage of the card C is a large-capacity capacitor built in the card C Or the card C is driven by a battery). When the card C is removed, there is no inter-card signal input to the card C. Therefore, the signal presence / absence detection circuit output is a logic indicating that there is no inter-card signal (in this example, when no signal continues for t1 time, (Change from “H” to “L”). At this time, since the timer circuit that operates by the logic change to the signal present state does not operate, the logic of the timer circuit output does not change (in this example, “H” is fixed). For this reason, the output stop control signal of the logical product output of the signal presence / absence detection circuit output and the timer circuit output is changed from the logic that can output the device output signal to the logic that stops the device output signal ( In this example, when the state of no signal continues for t1 time, it changes from “H” to “L”), and the output stop control circuit of FIG. Stop.

  On the other hand, when there is no power charge or the like as described above, the signal waveform of the signal presence / absence detection circuit output and the timer circuit output becomes “L” level as shown by the broken lines a and b due to the power interruption of the card C. The logical product output of the presence / absence detection circuit output and the timer circuit output is also at the “L” level, and the output stop control signal becomes the logic of the device output signal stop. Note that the device output signal from the card C is also stopped because the power is cut off regardless of these logic states.

  FIG. 6 shows an operation example when the card C is inserted into the apparatus. The solid line portion shows an operation in a transition period in which the power supply of the card C is not cut off even if the card C is removed due to power supply charging or the like.

  When there is no power supply charge or the like, the timer B output is initially set to “L” level and turned to “H” level when the card C is inserted, as indicated by the broken line a, due to the power supply of the card B being cut off. At this time, since the inter-card signal is a logic with no signal, the output stop control signal generated from the logical product of the signal presence / absence detection circuit output and the timer circuit output is the device output signal stop regardless of the presence / absence of the power supply charge. It becomes logic. The following operations are the same regardless of whether or not the power supply is charged because the power supply is restored.

  When the card C is completely inserted, there is an inter-card signal to be input. Therefore, the signal presence / absence detection circuit output is a logic indicating that there is an inter-card signal (in this example, if a signal is detected, “L “→ Change to“ H ”). Since the timer circuit 102 (FIG. 2) operates from the time when the logic of the signal presence / absence detection circuit output changes from the absence of the inter-card signal to the presence of the inter-card signal, the timer circuit 102 logic (see FIG. 2) operates. In this example, the logical change to the presence of a signal changes to “L” only for t2 time).

  The output stop control signal of the logical product output of the signal presence / absence detection circuit output and the timer circuit output is the device output signal stop logic ("L" in this example) when the timer circuit 102 is operating, and after that time has elapsed Is the logic (“H” in this example) that allows the device output signal. The output stop control circuit 10 of FIG. 1 is controlled by these logical changes, and the device output signal is stopped only for t2 time from the insertion of the card C.

  A configuration example of the output stop control circuit 10 illustrated in FIG. 1 will be described in comparison with a configuration example of the output stop control circuit 20 illustrated in FIG.

  According to the present embodiment, measures for stopping an inadvertent signal can be limited to a card output stop control circuit that directly outputs a device output signal. Therefore, it is not necessary to provide an output stop control circuit for all the cards.

  According to this embodiment, the function and configuration of the output stop control circuit can be simplified. That is, as described with reference to FIGS. 2 to 6, it can be realized only by setting the times t1 and t2 required by the system configuration of the apparatus. For this reason, the complicated control required in the configuration of FIG. 7 to detect and output that the own card can output a required signal and stop outputting the signal from the own card is unnecessary. The

  In the card C that directly outputs a device output signal, control by an output control signal from another card for controlling output of the card is unnecessary, and connection of signals between cards by the signal is also unnecessary. From the above, the output stop control circuit may be installed only on one card C. In addition, since the control is simple, it is possible to easily cope with customer requests.

  In FIG. 1, the configuration of the card related to the device output signal has been described with a simple example of three sheets. However, even when the number of cards exceeds three, it can be similarly applied as another embodiment of the present invention.

  The logic of “H” and “L” and the configuration of the logic circuit shown in FIGS. 2 to 6 can be changed as appropriate. Furthermore, the output control signals in FIG. 7 are shown in an example in which each card or device is connected on a one-to-one basis. However, if the signal connection is concentrated on the card C that directly outputs the device output signal. Any connection method can be used. Even if the configuration changes due to these differences, the same effect as the configuration illustrated in FIGS. 1 and 2 can be obtained.

  It should be noted that the disclosures of the above patent documents are incorporated herein by reference. Within the scope of the entire disclosure (including claims) of the present invention, the embodiments and examples can be changed and adjusted based on the basic technical concept. Various combinations and selections of various disclosed elements are possible within the scope of the claims of the present invention. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.

It is a figure which shows the structure of one Example of this invention. It is a figure which shows the structure of one Example of this invention. It is a figure which shows the operation example of one Example of this invention. It is a figure which shows the operation example of one Example of this invention. It is a figure which shows the operation example of one Example of this invention. It is a figure which shows the operation example of one Example of this invention. It is a figure which shows the structure of the conventional typical example.

Explanation of symbols

10, 20 Output stop control circuit 101 Signal presence / absence detection circuit 102 Timer circuit 103 AND circuit 104 Inter-card signal 105 Signal presence / absence detection circuit output signal (signal presence / absence detection circuit output)
106 Timer circuit output signal (Timer circuit output)
107 Output stop control signal

Claims (12)

It is equipped with a plurality of cards that can be inserted and removed freely, and the inter-card signals are sequentially transferred from one side to the other between the plurality of cards, and mounted on a communication device that outputs a device output signal from the card on the other end. Output stop control circuit,
Arranged on the card at the other end that outputs the device output signal,
An output stop control circuit, wherein output stop of the device output signal is controlled based on a detection result of an inter-card signal from a card adjacent to the card at the other end.   When at least one inter-card signal of the inter-card signal from the adjacent card is input and the inter-card signal detects a change from the presence of the signal to the absence of the signal, the state of no inter-card signal continues for a predetermined time. 2. The output stop control circuit according to claim 1, wherein control is performed to determine that there is no inter-card signal and to stop the output of the device output signal.   When at least one inter-card signal of the inter-card signal from the adjacent card is input, and when the inter-card signal detects a change from no signal to presence of a signal, and when there is an inter-card signal after a predetermined time has elapsed 3. The output stop control circuit according to claim 1, wherein it is determined that there is an inter-card signal, and the device output signal is controlled to be output. An internal signal generation circuit for generating an output stop control signal for controlling output stop of the device output signal;
The internal signal generation circuit includes:
A signal presence / absence detection circuit for inputting at least one inter-card signal of inter-card signals from the adjacent card and detecting the presence / absence of the inter-card signal;
A timer circuit that starts timing when the output signal of the signal presence / absence detection circuit changes from no signal to presence of a signal, and outputs a predetermined value during timing until timeout,
When the output of the timer circuit is not the predetermined value indicating that the time is being measured and the detection result of the signal presence / absence detection circuit indicates that there is a signal, the output stop control signal can be output as the device output signal. Value
When the output of the timer circuit is the predetermined value indicating that the time is being measured, or the detection result of the signal presence / absence detection circuit is either no signal, the output stop control signal is output as a device output signal. A logic circuit to set the stop value;
The output stop control circuit according to claim 1, wherein the output stop control circuit is provided.   When the signal presence / absence detection circuit detects a change from the presence of an inter-card signal to the absence of an inter-card signal, and the state of no inter-card signal continues for a predetermined time, the detection result is regarded as no inter-card signal. The output stop control circuit according to claim 4.   5. The output stop control circuit according to claim 4, wherein the predetermined period counted by the timer circuit is variably settable.   6. The output stop control circuit according to claim 5, wherein a predetermined period of the signal presence / absence detection circuit is variably settable.   A communication apparatus comprising the output stop control circuit according to claim 1. An output of a communication device comprising a plurality of cards that are detachably mounted, wherein inter-card signals are sequentially transferred from one side to the other side between the plurality of cards, and a device output signal is output from the card at the other end. A stop control method,
The card at the other end that outputs the device output signal controls output stop of the device output signal based on the detection result of at least one inter-card signal of the inter-card signal from the adjacent card. An output stop control method characterized by the above.   For at least one inter-card signal of the inter-card signal from the adjacent card, when a change from the presence of a signal to no signal is detected and the state of no inter-card signal continues for a predetermined time, 10. The output stop control method according to claim 9, wherein the output stop control is performed by determining and controlling the output stop of the device output signal.   When at least one inter-card signal of the inter-card signal from the adjacent card is detected as a change from no signal to presence of a signal, and when there is an inter-card signal after a predetermined time has elapsed, it is determined that there is an inter-card signal. 11. The output stop control method according to claim 9, wherein the output signal is controlled to be output. Detects the presence or absence of inter-card signals, starts counting with a timer when there is no inter-card signal, and with inter-card signals, counts a predetermined period,
When the timer is not timing and there is a signal between cards, the output of the device output signal is enabled,
The output of the device output signal is stopped when the timer is counting or when the inter-card signal is no signal. The output stop control method described in 1.

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