JP2001266196A - Multiple device system and its device switching method and fare reception system and its device switching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ETC system which can perform the safe and sure switching of devices even when a bus is locked due to the failure of one of both devices about a lane controller having a radio communication part where plural devices (communication control parts) are multiplexed and connected to the bus. SOLUTION: When a PCI bus 20 has a deadlock due to the failure of a primary communication control part 17, a monitoring part 13a supplies a control signal to the part 17 to separate electrically the part 17 from the bus 20. Then a system clear signal (SCLR) is transmitted to a 1st radio communication part 11a to forcibly reset the part 11a. When the part 11a is started, the part 13a instructs an ETC processing part 19 to use a secondary communication control part 18 via a data transmission part 41 to perform the switching between both control parts 17 and 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex device system having a plurality of devices multiplexed and connected so as to be selectively used for a bus, a method of switching the devices, and a toll road toll. The present invention relates to a collection system and a device switching method thereof.

[0002]

2. Description of the Related Art ETC (Electronic Toll Collection)
Is a system that transfers tolls at tollgates on toll expressways by exchanging toll information by wireless communication between the roadside antenna installed at the tollgate and the vehicle-mounted device mounted on the vehicle. is there. As a result, vehicles (ETC vehicles equipped with on-vehicle devices) can pass through the tollgates without stopping, and congestion at the tollgates can be eliminated or alleviated.

[0003] The equipment installed at the toll booth of the ETC system includes, for example, a roadside antenna for performing wireless communication with an on-vehicle device mounted on the vehicle, and a vehicle at a predetermined position on the lane. A vehicle detection device that detects and generates various timings for ETC processing, a start controller that controls whether or not the vehicle can pass by a breaker, etc., and displays the completion of ETC processing and whether or not the vehicle can pass to the driver And a lane control device for controlling these devices. The control of the roadside antenna is performed by a wireless communication unit in the lane controller.

The radio communication unit in the lane controller often employs a configuration in which a plurality of communication control units for controlling a roadside antenna are multiplexed. These multiple communication control units
One always enabled, in case of maintenance and failure
It is alternatively switched and used so that others are disabled. That is, each communication control unit:
It has a function of diagnosing its own state and issuing a failure notification when there is a problem, and switching of the enable / disable state of each communication control unit is performed by this failure notification.

[0005]

However, depending on the state of the failure in the communication control unit, the failure may not be able to provide a failure notification function and issue a failure notification. Also, if the communication control unit goes down while using the bus, depending on the type of bus, (P
It is highly probable that the bus will fall into an unusable state (locked state). If the bus falls into the locked state, a switching instruction to each communication control unit cannot be given via the bus, and it may take a long time to recover the ETC process.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a multi-device system and a multi-device system capable of safely and reliably switching devices even when a bus is locked due to a device failure. It is an object to provide a device switching method, a toll collection system, and a device switching method of the toll collection system.

[0007]

According to a first aspect of the present invention, there is provided a bus and a plurality of devices multiplexed and connected so as to be selectively used for the bus. In a multiplex device system having a monitoring target unit including a monitoring unit, the monitoring unit monitors a state of the monitoring target unit, and is used when the monitoring unit determines that the monitoring target unit is abnormal. Reset instruction means for electrically disconnecting the device inside from the bus to reset the monitoring target unit, and device switching instruction means for instructing the reset monitoring target unit to switch the device to be used. It is characterized by the following.

In the present invention, if the monitoring unit determines that the monitoring target unit is abnormal, the monitoring unit regards the abnormality of the monitoring target unit as being caused by a bus lock or the like caused by a device failure, and
By forcibly resetting the monitoring target unit and restoring the bus and then instructing to switch the devices, the devices can be switched reliably and safely even when the bus is locked.

According to another aspect of the present invention, there is provided a monitoring system including a bus and a plurality of devices multiplexed and connected so as to be selectively used for the bus. In a multiplex device system having a target unit and a monitoring unit, the failure monitoring unit that notifies the monitoring unit via a predetermined transmission medium other than the bus when the respective devices of the monitoring target unit fail, A monitoring unit that monitors the state of the monitoring target unit, and that, when the monitoring unit determines that the monitoring target unit is abnormal, the device in use regardless of whether a failure notification is received from the device. Reset instruction means for electrically disconnecting from the bus to reset the monitoring target unit; and device switching instruction means for instructing the reset monitoring target unit to switch the device to be used. And wherein the Rukoto.

The present invention is applicable to a case where a device of a monitoring target unit is configured to notify the monitoring unit of a failure through a predetermined transmission medium other than a bus, regardless of whether a failure notification is received from the device. If the abnormality of the monitoring target part is determined, the abnormality of the monitoring target part is considered to be due to a bus lock or the like caused by a device failure, and the monitoring target part is forcibly reset to restore the bus. By instructing to switch the device, the device can be switched. That is, even when the failure notification function is broken due to the failure of the device, the device can be reliably switched.

Further, in order to achieve the above-mentioned object,
A third invention is a multi-device system having a monitoring target unit having a bus and a plurality of devices multiplexed and connected so as to be selectively used for the bus and a monitoring unit, A failure notifying unit that notifies the monitoring unit via a predetermined transmission medium other than the bus when the respective devices of the monitoring target unit fail, wherein the monitoring unit monitors a state of the monitoring target unit; Means, when a failure is notified from the device in use and the monitoring unit determines that the monitoring target unit is abnormal, the monitoring target unit is electrically disconnected from the bus with the notification of the failure from the bus. It is characterized by comprising reset instruction means for resetting, and device switching instruction means for instructing the reset monitoring target unit to switch the device to be used.

According to the present invention, when a device in a monitoring target unit is configured to notify the monitoring unit of a failure through a predetermined transmission medium other than a bus, the failure is notified from a device in use and the monitoring target is notified. When the abnormality of the unit is determined, the monitoring target unit is forcibly reset and the bus is restored in a state where the device notified of the failure is electrically disconnected from the bus, and then the device switching is instructed. This makes it possible to reliably switch the devices while the bus is locked.

[0013]

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

FIG. 1 shows an embodiment E according to the present invention.
1 shows a configuration of a device installed at a tollgate entrance of a TC system.

[0015] As shown in FIG.
Non-ETC lane A where a pass is passed between the attendant of the manned booth 1 and the driver of the vehicle, and the toll gate 3
roadside antennas 4a, 4b installed in a, 3b and ETC
There is an ETC lane B in which toll information is exchanged by wireless communication with the vehicle-mounted device 15 mounted on the vehicle 2.

In the ETC lane B, not only roadside antennas 4a and 4b installed in the toll gates 3a and 3b but also vehicles passing a predetermined position on the ETC lane B are detected as equipment for ETC processing. Detection device (first vehicle detection device 5a, second vehicle detection device 5b, third vehicle detection device 5c) for generating various timings for ETC processing, and A start controller 6 for controlling the permission / prohibition and a roadside display 7 for displaying the completion of the ETC process and the permission / prohibition of the vehicle to the driver are arranged. These devices are connected to the lane control device 8 via a data transmission cable, and the lane control device 8 exchanges signals with the above-described devices to control the entire ETC process.

An example of the ETC processing control by the lane control device 8 will be described below.

The lane control device 8 includes the first vehicle detection device 5
When the vehicle entrance is detected by a, the first roadside antenna 4a on the upstream side is controlled, and the vehicle-mounted device 15 of the vehicle 2 entering the tollgate area is inquired of communication, and the vehicle-mounted device 15 Receive billing information and vehicle information. When the lane control device 8 confirms that the expiration date of the received billing information and the remaining balance of the advance payment are not 0, the vehicle-mounted device outputs information for specifying the entrance of the toll road (hereinafter, these are referred to as first entrance information). 15 to be sent.

The lane control device 8 is provided with the first
, The vehicle 2 is determined to be a normal vehicle-mounted device-equipped vehicle (ETC vehicle), and the road-side display 7 displays completion of ETC processing. At this point, if there is no preceding vehicle, the start controller 6 is instructed to perform an opening operation. If there is a preceding vehicle, an instruction to open the start controller 6 is issued after the processing of the preceding vehicle is completed.

When the vehicle has passed the second vehicle detection device 5b, the lane control device 8 instructs the roadside display 7 to turn off the display of the completion of the ETC processing. Then ET
The C vehicle 2 passes through the start controller 6, and subsequently passes through the third vehicle detection device 5c. When the passage of the ETC vehicle 2 is detected by the third vehicle detection device 5c, the lane control device 8
Instructs the start controller 6 to perform the closing operation, and at the same time, starts a communication inquiry with the vehicle-mounted device 15 by the downstream second roadside antenna 4b.

When the vehicle-mounted device 15 recognizes that the inquiry is from a valid antenna, the vehicle-mounted device 15 compares the ID number notified from the IC card 16 in advance and the ID number registered in the memory section of the vehicle-mounted device 15 with the second. The signal is transmitted to the lane controller 8 through the roadside antenna 4b. The lane control device 8 compares the ID number of the IC card 16 and the ID number of the vehicle-mounted device 15 received from the vehicle-mounted device 15 with those already received by the first roadside antenna 4a. If they match, the vehicle type determination result already obtained by the vehicle type determination device (not shown), the vehicle information transmitted from the vehicle-mounted device 15, and the ID
The number comparison information (hereinafter referred to as second entrance information) is transmitted to the vehicle-mounted device 15 using the second roadside antenna 4a.
Wirelessly.

When the vehicle-mounted device 15 confirms that the second entrance information has been normally received, the vehicle-mounted device 15 notifies the lane controller 8 of the completion of the reception.
To the first entry information and the second entry
Is recorded on the IC card 16.

In the exit lane, the vehicle information is sent from the vehicle-mounted device 15 to the lane controller 8 in addition to the entrance information (first entrance information and second entrance information) recorded at the entrance. The lane control device 8 calculates the toll based on the entrance information received from the on-vehicle device 15, and also checks the billing information and the ID number included in the vehicle information with the negative list. If the validity of the ID number is confirmed by the negative list collation, a combination of the entrance information and the exit information (tollgate number, passing date and time, lane number, toll) is transmitted to the vehicle-mounted device 15 as a use history. I do. When the use history is successfully received, the vehicle-mounted device 15 returns a reception completion notification to the lane control device 8 and records the use history on the IC card 16.

Next, the configuration of the lane control device 8 will be described.

FIG. 2 shows a part of the configuration of the lane control device 8. As shown in the figure, the lane control device 8 includes a first wireless communication unit 11a that performs wireless communication with the vehicle-mounted device 15 using the first roadside antenna 4a, and a vehicle mounted using the second roadside antenna 4b. Wireless communication unit 1 for performing wireless communication with the device 15
1b, a main control unit 12 for controlling the entire lane control device including these wireless communication units 11a and 11b, a monitoring unit 13a for monitoring the state of the first wireless communication unit 11a, and a second wireless communication unit. And a monitoring unit 13b for monitoring the state of the monitoring unit 11b.

FIG. 3 shows the details of the first wireless communication unit 11a and the monitoring unit 13a.

The first wireless communication section 11a has a configuration multiplexed by two communication control sections 17 and 18 which are selectively used. These communication control units 17 and 1
Reference numeral 8 corresponds to the “device” in the present invention. These two communication control units 17 and 18 are respectively a CPU,
It may be mounted as a separate board device on a system board on which devices constituting the system such as a memory and a bus are mounted, or may be mounted as an on-board device on the system board. . Also,
The system board includes an ETC for each of the communication control units 17 and 18.
An ETC control unit 19 that performs control for processing is mounted as a board device or mounted as an on-board device on a system board, similarly to the communication control units 17 and 18. And these two communication control units 17, 18 and E
The TC controllers 19 are interconnected via a PCI bus 20 on the system board.

The two communication control units 17 and 18 and the monitoring unit 13a (CPU 31) are connected to the failure notification signal line 22,
24 and signal lines 21 and 23 for switching control. That is, the communication control units 17 and 18 have a function of performing a self-diagnosis, and notify the monitoring unit 13a of a failure signal through the signal lines 22 and 24 when any abnormality is detected. Further, the communication control units 17 and 18 have a function of electrically disconnecting themselves from the PCI bus 20 based on the switching control signal received from the monitoring unit 13a via the signal lines 21 and 23.

Further, the monitoring unit 13a (CPU 31) is connected to the ETC processing unit 19 in the wireless communication unit 11a through a high-speed data transmission unit 41 such as a dual port memory. The monitoring unit 13a issues a switching command of the communication control units 17 and 18 to the ETC processing unit 19 through the data transmission unit 41, and monitors the monitoring target unit (the first wireless communication unit) through the state of the ETC processing unit 19. 11a) has a monitoring function for periodically checking whether or not 11a) is operating normally. Further, the monitoring unit 13a sends a system clear signal (SCL) to the first wireless communication unit 11a through the signal line 25.
R), and the first wireless communication unit 11a has a function of resetting (restarting) the entire system by the system clear signal (SCLR).

Next, the operation of this embodiment will be described.

The abnormal mode due to the failure of the communication control units 17 and 18 includes, for example, a failure signal is valid and the PCI bus is normal (abnormal mode 1) a failure signal is valid and the PCI bus is abnormal (abnormal mode 2) ) ・ The failure signal is invalid and the PCI bus is abnormal (abnormal mode 3).

Hereinafter, the switching operation of the communication control units 17 and 18 corresponding to each abnormal mode will be described. FIG. 4 shows a flow of the switching control by the monitoring unit 13a.

First, abnormal mode 1 (failure signal is valid, P
The case where the CI bus is normal) will be described. Note that 17
Is a communication control unit on the main side in operation, and 18 is a communication control unit on the secondary side in standby.

When the monitoring unit 13a receives the failure signal from the communication control unit 17 on the main side in step 51, the monitoring unit 13a issues a command to switch the communication control unit to the ETC processing unit 19 through the data transmission unit 41 such as a dual port memory. Issue (step 56). When receiving the switching command, the ETC processing unit 19 instructs the communication control unit 17 which has been the main side up to that point,
An instruction to stop operation is given through the CI bus 20;
Instead, it gives an instruction to start operation via the PCI bus 20 to the communication control unit 18 which has been the secondary side. Thus, the device to be used is switched from the communication control unit 17 to the communication control unit 18.

Next, in abnormal mode 2 (failure signal is valid, P
The case where the CI bus is abnormal) will be described. Then P
Since the CI bus 20 is already locked, data cannot be exchanged between the ETC processing unit 19 and the monitoring unit 13a in the monitoring target unit (the first wireless communication unit 11a).

When the monitoring unit 13a receives the failure signal from the communication control unit 17 on the main side in step 51, the monitoring unit 13a checks the state of the ETC processing unit 19 through the data transmission unit 41 (step 52), and if the ETC processing unit 19 is normal. Executes the next routine, knowing that it is not running.

The monitoring unit 13a supplies a control signal for electrically disconnecting the main communication control unit 17 from the PCI bus 20 to the main communication control unit 17 through the signal line 21 (step 53). As a method of electrically disconnecting the communication control unit 17 from the PCI bus 20, the communication control unit 1 on the main side is used.
7, a method of forcibly setting the I / F unit with the PCI bus 20 to high impedance, a method of cutting off the power supply to the communication control unit 17 by a relay or the like.

Subsequently, the monitoring unit 13a sends a system clear signal (SC) to the first wireless communication unit 11a through the signal line 25.
LR) (step 54), and the first wireless communication unit 11
a is forcibly reset. At this time, since the communication control unit 17 in which the failure has occurred is electrically disconnected from the PCI bus 20, the communication control unit 17 starts up normally without being damaged by the failed communication control unit 17.

When the first wireless communication unit 11a has successfully started up (step 55), the monitoring unit 13a instructs the ETC processing unit 19 to use the secondary communication control unit 18 via the data transmission unit 41 (step 55). 56). ETC
The processing unit 19 sends the secondary communication control unit 18 according to the instruction.
Is enabled, whereby switching from the communication control unit 17 to the communication control unit 18 of the communication control unit to be used is achieved.

Next, in abnormal mode 3 (failure signal invalid, P
The case where the CI bus is abnormal) will be described.

At this time, since the PCI bus 20 has already been locked, data cannot be exchanged between the ETC processing unit 19 and the monitoring unit 13a in the monitoring target unit (first wireless communication unit 11a).

The monitoring unit 13a periodically checks the state of the ETC processing unit 19 through the data transmission unit 41 in step 57, and determines that the ETC processing unit 19 is not operating (the abnormal state of the monitoring target unit). Once caught, the following routine is executed to switch the communication control unit.

The monitoring unit 13a supplies a control signal for electrically disconnecting the main communication control unit 17 from the PCI bus 20 to the main communication control unit 17 through the signal line 21 (step 53). Subsequently, the monitoring unit 13a sends a system clear signal (SCLR) to the first wireless communication unit 11a via the signal line 25 (step 54), and forcibly resets the first wireless communication unit 11a. Also at this time, since the communication control unit 17 in which the failure has occurred is electrically disconnected from the PCI bus 20, the communication control unit 17 can be started up without being damaged by the failed communication control unit 17.

When the first wireless communication unit 11a has successfully started up (step 55), the monitoring unit 13a instructs the ETC processing unit 19 to use the secondary communication control unit 18 via the data transmission unit 41 (step 55). 56). ETC
The processing unit 19 sends the secondary communication control unit 18 according to the instruction.
Is enabled, whereby the switching of the communication control unit is achieved.

The switching procedure of the communication control unit described above is such that after the main / sub relationship of each of the communication control units 17 and 18 is switched once, a failure or the like of the communication control unit 18 occurs again, and the communication control unit to be operated is operated again. Switching from the communication control unit 18 to the communication control unit 17 is performed in the same manner.

In the above embodiment, the two multiplexed communication control units 17 and 18 in the first wireless communication unit 11a are used.
Although the description has been given of the case where the switching is performed, the monitoring unit 13b performs the same operation when switching between the two multiplexed communication control units in the second wireless communication unit 11a.

As described above, according to the present embodiment,
When the PCI bus 20 is deadlocked due to the failure of the communication control unit, the failed communication control unit is replaced with the PCI bus 20.
Forcibly reset the monitoring target unit in a state where it is electrically disconnected from the device, and when the monitoring target unit is successfully started up, make the monitoring target unit execute switching of the communication control unit to be used. Switching can be performed.

According to the present embodiment, even if the failure notification of the communication control unit does not function, the monitoring unit 13a periodically checks the state of the ETC processing unit 19 through the data transmission unit 41, Since a state in which the unit 19 is not operating (an abnormal state of the monitoring target unit) is regarded as a state in which the communication control unit in use is in a failure state, a routine for switching the communication control unit is executed. When the control unit fails, the communication control unit can be quickly switched. Therefore, it is possible to provide a highly reliable ETC system by shortening the suspension period of the ETC process due to the failure of the communication control unit.

Although the lane control device of the ETC system has been described above, the present invention is not limited to this, and a plurality of devices are multiplexed and connected to a bus, and each device is switched and used when a failure occurs. The present invention can be applied to any system as long as it is a multiplex device system.

Furthermore, in the lane control device of the ETC system according to the present embodiment, the configuration of the means for switching the multiplexed communication control unit in the radio communication unit when a failure occurs has been described. The present invention may be applied to means for switching the multiplexed device at the time of its failure.

[0051]

As described above, according to the present invention, among a plurality of devices multiplexed and connected so as to be selectively used for the bus, the bus is used due to the failure of the device being used. In addition, even when the entire monitoring target unit is locked, the device can be switched safely and reliably. In addition, even if the failure notification function of the device is broken due to the failure of the device, the device can be reliably switched.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a device installed at a tollgate entrance of an ETC system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a lane control device in FIG. 1;

FIG. 3 is a diagram showing a configuration of a first wireless communication unit and a monitoring unit of the lane control device in FIG. 2;

FIG. 4 is a diagram showing a flow of switching control of a communication control unit by a monitoring unit of the embodiment.

[Explanation of symbols]

 Reference Signs List 1 manned booth 2 ETC vehicle 3a, 3b toll gate 4a, 4b roadside antenna 5a, 5b, 5c vehicle detection device 6 start controller 7 roadside display 8 lane control device 11a, 11b wireless communication unit 12 main control unit 13a, 13b monitoring Unit 15 On-board unit 16 IC card 17, 18 Communication control unit 19 ETC processing unit 20 PCI bus 21, 23 Switching control signal line 22, 24 Failure notification signal line 25 System clear signal (SCLR) signal line 31 CPU 41 Data transmission unit

Claims (12)

[Claims] 1. A multi-device system having a monitoring unit and a monitoring unit including a bus and a plurality of devices multiplexed and connected to be selectively used for the bus, the monitoring unit comprising: A monitoring unit that monitors a state of the monitoring target unit, and when the monitoring unit determines that the monitoring target unit is abnormal, the device in use is electrically disconnected from the bus to reset the monitoring target unit. A multiplex device system comprising: reset instruction means for causing a device to be reset; and device switching instruction means for instructing the reset monitoring target unit to switch a device to be used. 2. A multi-device system comprising: a monitoring target unit including a bus and a plurality of devices multiplexed and connected so as to be selectively used for the bus, and a monitoring unit; A failure notifying unit that notifies the monitoring unit via a predetermined transmission medium other than the bus when the respective devices of the target unit fail, a monitoring unit that monitors a state of the monitoring target unit; And resetting the monitoring target unit by electrically disconnecting the in-use device from the bus regardless of the failure notification from the device when the monitoring unit determines that the monitoring target unit is abnormal. A multiplex device system comprising: an instruction unit; and a device switching instruction unit that instructs the reset monitoring target unit to switch a device to be used. 3. A multi-device system including a monitoring target unit and a monitoring unit having a bus and a plurality of devices multiplexed and connected so as to be selectively used for the bus, wherein the monitoring is performed. A failure notifying unit that notifies the monitoring unit via a predetermined transmission medium other than the bus when the respective devices of the target unit fail, a monitoring unit that monitors a state of the monitoring target unit; When a failure is notified from the device in use and the monitoring unit determines that the monitoring target unit is abnormal, the device notified of the failure is electrically disconnected from the bus to reset the monitoring target unit. A multi-device system comprising: reset instruction means for causing the monitoring target unit to be reset; 4. A device switching method for a multi-device system having a monitoring target unit having a bus and a plurality of devices multiplexed and connected so as to be selectively used for the bus, and a monitoring unit. The monitoring unit monitors the state of the monitoring target unit, and when the abnormality of the monitoring target unit is determined, electrically disconnects the device in use from the bus and resets the monitoring target unit. A device switching method for a multiplex device system, comprising: instructing a reset monitoring target unit to switch a device to be used. 5. A device switching method for a multi-device system having a monitoring target unit having a bus and a plurality of devices multiplexed and connected so as to be selectively used for the bus, and a monitoring unit. A function of notifying the monitoring unit via a predetermined transmission medium other than the bus when the respective devices of the monitoring target unit fail, the monitoring unit monitors a state of the monitoring target unit, When the abnormality of the monitoring target unit is determined, the device in use is electrically disconnected from the bus irrespective of the failure notification from the device to reset the monitoring target unit, and the reset monitoring target is reset. A device switching method for a multi-device system, comprising: instructing a unit to switch a device to be used. 6. A device switching method for a multi-device system having a monitoring target unit having a bus and a plurality of devices multiplexed and connected so as to be selectively used for the bus, and a monitoring unit. A function of notifying the monitoring unit via a predetermined transmission medium other than the bus when the respective devices of the monitoring target unit fail, the monitoring unit monitors a state of the monitoring target unit, When the abnormality of the monitoring target unit is determined and the failure is notified from the device in use, the device notified of the failure is electrically disconnected from the bus to reset the monitoring target unit, and the reset is performed. A device switching method for a multi-device system, which instructs a monitoring target unit to switch a device to be used. 7. A toll collection system comprising a bus and a lane controller having a monitoring unit including a plurality of devices multiplexed and connected so as to be selectively used for the bus and a monitoring unit. In the system, the monitoring unit is configured to monitor a state of the monitoring target unit, and electrically disconnect the device in use from the bus when the monitoring unit determines that the monitoring target unit is abnormal. A toll collection system comprising: reset instruction means for resetting the monitoring target unit; and device switching instruction means for instructing the reset monitoring target unit to switch a device to be used. 8. A toll collection system comprising a bus and a lane controller having a monitoring unit including a plurality of devices multiplexed and connected so as to be selectively used for the bus and a monitoring unit. In the system, when the respective devices of the monitoring target unit fail, the failure notification unit that notifies the monitoring unit of the failure via a predetermined transmission medium other than the bus, the monitoring unit includes a status of the monitoring target unit. A monitoring unit that monitors the monitoring target when the monitoring unit determines that the monitoring target unit is abnormal, regardless of whether there is a failure notification from the device and electrically disconnects the device being used from the bus. Toll resetting means for resetting a unit, and device switching instruction means for instructing the reset monitoring target unit to switch a device to be used. Stem. 9. A toll collection system comprising a bus and a lane control device having a monitoring unit and a monitoring unit including a plurality of devices multiplexed and connected to be selectively used for the bus. In the system, the monitoring unit monitors a state of the monitoring target unit, and a failure is notified from a device in use and when the monitoring unit determines that the monitoring target unit is abnormal, the failure is determined. Reset instruction means for electrically disconnecting the notified device from the bus to reset the monitoring target unit; and device switching instruction means for instructing the reset monitoring target unit to switch the device to be used. A toll collection system characterized by the following. 10. A toll collection system comprising a bus and a lane control device having a monitoring unit including a plurality of devices multiplexed and connected to be selectively used for the bus and a monitoring unit. In the device switching method of the system, the monitoring unit monitors a state of the monitoring target unit, and when the abnormality of the monitoring target unit is determined, electrically disconnects the device in use from the bus and monitors the monitoring target. Resetting the unit, and instructing the reset monitoring target unit to switch the device to be used. 11. A toll collection system comprising a bus and a lane controller having a monitoring unit including a plurality of devices multiplexed and connected so as to be selectively used for the bus and a monitoring unit. The device switching method of the system, further comprising a function of notifying the monitoring unit via a predetermined transmission medium other than the bus when the respective devices of the monitoring target unit fail, wherein the monitoring unit includes the monitoring target unit. The state of the monitor, when the abnormality of the monitoring target unit is determined, regardless of the presence or absence of a failure notification from the device, the device in use is electrically disconnected from the bus to reset the monitoring target unit, A device switching method for a toll collection system, comprising: instructing the reset monitoring target unit to switch a device to be used. 12. A toll collection system comprising a bus and a lane controller having a monitoring unit including a plurality of devices multiplexed and connected so as to be selectively used for the bus and a monitoring unit. The device switching method of the system, further comprising a function of notifying the monitoring unit via a predetermined transmission medium other than the bus when the respective devices of the monitoring target unit fail, wherein the monitoring unit includes the monitoring target unit. When the abnormality is determined in the monitoring target portion and a failure is notified from the control device in use, the lane in a state where the control device informed of the failure is electrically disconnected from the bus. A lane control device switching method for a toll collection system, comprising: resetting a control device and instructing the reset lane control device to switch a control device to be used.