Cordless telephone set

The present invention relates to a telephone control technique, and more particularly to a misplacement detection technique for detecting misplacement of a slave unit with respect to a master unit of a cordless telephone.

Cordless telephones include curl cordless telephones in which a master unit having a call control function and a handset-type slave unit having a call function are connected via a wireless line. Normally, the master unit is connected to a telephone line from the network side or an extension line from a control device of a telephone system such as a button telephone device, and a handset-type slave unit is mounted on the charging stand of the master unit that forms a pair. It is placed and charged.

In this type of curl cordless telephone, when a wireless system capable of one-to-many connection such as Bluetooth (see Non-Patent Document 1 etc.) is used as the wireless interface for connecting the master unit and the slave unit, individual curls are used. In order to identify the combination of the master unit and the slave unit from others in the cordless telephone, the authentication code unique to the curl cordless telephone is registered in the master unit and the slave unit in advance, and the slave unit registration process for associating the two is performed.

Conventionally, in such a curl cordless phone, when replacing only the master unit with a new master unit, the old master unit and the new master unit are connected with a dedicated connector to specify the replacement target, and these parent units are special. By transferring the authentication code from the old master unit to the new master unit after ensuring security by performing operations, it is possible to replace only the master unit while maintaining the association with the slave unit. (See, for example, Patent Document 1).

<patcit num="1"><text>Japanese Unexamined Patent Publication No. 7-75169</text></patcit><nplcit num="1"><text>www.bluetooth.org/spec/</text></nplcit>

<p> However, in the conventional cordless telephone described above, a dedicated connector and complicated operations are required to identify the replacement target and ensure security, so that the user can easily maintain the association with the slave unit and easily use the master unit. There was a problem that one of the handsets and handsets could not be replaced. The present invention is to solve such a problem, and to provide a cordless telephone that can easily replace either a master unit or a slave unit without requiring a dedicated connector or complicated operation. I am aiming.</p>

<p> In order to achieve such an object, the cordless telephone according to the present invention has a master unit connected to a line to perform call control, and a master unit connected to the master unit via a wireless line to perform a call via the line. It is a cordless telephone that has a slave unit and performs slave unit registration processing that associates these slave units and the master unit as a pair by exchanging various information between the slave unit and the master unit via a wireless line. , The slave unit transmits a wireless interface unit that wirelessly communicates with the master unit via a wireless line, and a slave unit registration request including an authentication code unique to the cordless phone during the slave unit registration process from the wireless interface unit to the master unit. It is equipped with a slave unit control unit and a wireless ID tag that transmits an authentication code to the master unit during the slave unit registration process by performing short-range wireless communication using a predetermined wireless signal, and the master unit is provided via a wireless line. The wireless interface unit that wirelessly communicates with the slave unit, the tag interface unit that receives the authentication code transmitted by the wireless signal from the slave unit, and the authentication included in the slave unit registration request from the slave unit received by the wireless interface unit. It is equipped with a master unit control unit that compares the code with the authentication code received by the tag interface unit and determines the success or failure of the slave unit registration request according to the comparison result.</p><p> At this time, the slave unit is further provided with a detection unit that detects a specific operation, and the slave unit control unit confirms whether or not the master unit that is paired with the slave unit is registered when the specific operation is detected by the detection unit. , The slave unit registration process may be started according to the unregistration.</p><p> In addition, the master unit is further provided with a detection unit that detects a specific operation, and the master unit control unit confirms whether or not a slave unit that forms a pair with the master unit is registered when the detection unit detects a specific operation. In response to the unregistration, the handset registration start instruction for instructing the start of the handset registration process is transmitted from the wireless interface unit to the handset, and the handset control unit registers the handset from the master unit received by the wireless interface unit. The slave unit registration process may be started in response to the start instruction.</p><p> Further, the detection unit may detect the placement of the slave unit on the master unit as a specific operation.</p>

<p> According to the present invention, the authentication code unique to the cordless telephone transmitted by the master unit from the wireless ID tag of the slave unit by short-range wireless communication and the authentication code included in the slave unit registration request from the slave unit are used. Since the comparison is made and the success or failure of the slave unit registration request is determined according to the comparison result, the short-range wireless communication of the wireless ID tag can be performed while any slave unit is mounted on the master unit. The slave unit registration request from the slave unit within the reach is accepted by the master unit and the slave unit registration is performed. Therefore, when replacing the slave unit, simply by mounting a new slave unit on the original master unit, the slave unit is automatically associated with the master unit and can be used as a new slave unit of the master unit. .. As a result, the slave unit can be easily replaced without requiring a dedicated connector or complicated operation as in the past.</p><p> In addition, the slave unit registration start instruction is sent from the master unit to the slave unit according to the unregistered slave unit to be paired, and the slave unit registration process is started in the slave unit accordingly. The handset can be registered in response to the handset registration request from the on-board handset. Therefore, when replacing the master unit, simply by mounting the original slave unit on the new master unit, the slave unit is automatically associated with the master unit and can be used as a new master unit of the slave unit. .. As a result, the master unit can be easily replaced without requiring a dedicated connector or complicated operations as in the past.</p>

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

[First Embodiment]

First, the curl cordless telephone according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is an explanatory diagram showing a schematic configuration of a curl cordless telephone according to the first embodiment of the present invention. This curl cordless telephone is a telephone in which a pair of a master unit 1 having a call control function and a handset type slave unit 2 having a call function are connected via a wireless line 3.

The master unit 1 is connected to a line 1L such as an extension line from a telephone system control device (not shown) such as a telephone line from a network or a button telephone device. The master unit 1 is provided with a charging stand 1A as a mounting place for mounting the slave unit 2 and charging, etc., and depending on the mounting of the slave unit 2 on the charging stand 1A, the slave unit 2 The charging terminal 2B is electrically connected to the charging terminal 1B of the master unit 1, and the battery in the slave unit 2 is charged by the power supply from the master unit 1 via these charging terminals 1B and 2B.

Further, in the slave unit registration process for associating the master unit 1 and the slave unit 2, the slave unit registration request from the slave unit 2 including the authentication code (phone identification information) unique to the curl cordless phone is received. The authentication code stored in advance in 1 is compared with the authentication code notified by the slave unit 2 in the slave unit registration request, and the authentication code is wirelessly transmitted between the master unit 1 and the slave unit 2 according to the match. Register as an authentication code used for communication.

In the present embodiment, the wireless ID tag is provided in the slave unit 2, and the tag interface unit for receiving the authentication code notified from the wireless ID tag of the slave unit 2 is provided in the master unit 1, and the slave unit 2 to the master unit 1 When the handset registration process is performed, the authentication code unique to the curl cordless phone is sent from the wireless ID tag of the handset 2 and received by the base unit 1, and the received authentication code and the handset registration request are sent from the handset 2. By comparing with the authentication code notified to the master unit 1, the success or failure of the slave unit registration request is determined.

[Master unit]

Next, the master unit of the curl cordless telephone according to the first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of a master unit of a curl cordless telephone according to the first embodiment of the present invention. The master unit 1 includes a line interface unit (hereinafter referred to as a line I / F unit) 10, a wireless interface unit (hereinafter referred to as a wireless I / F unit) 11, a voice processing unit 12, and a tag interface unit (hereinafter referred to as a tag I / F unit). (F unit) 13, display unit 14, operation input unit 15, storage unit 16, power supply unit 17, mounting detection unit 18, and master unit control unit 19 are provided.

The line I / F section 10 is a circuit section that terminates and controls the line 1L from a control device of a network or a telephone system. The wireless I / F unit 11 is a circuit unit that wirelessly communicates with the slave unit 2 via the wireless line 3. The voice processing unit 12 has a speakerphone function for making a call on the master unit 1 without using the slave unit 2, that is, a handset, and generates various notification sounds for notifying the user of various states such as an incoming call or misplacement. It is a circuit unit having a function. The tag I / F unit 13 is a circuit unit that receives an authentication code transmitted by a predetermined wireless signal from the wireless ID tag of the slave unit 2 described later and outputs the authentication code to the master unit control unit 19.

The display unit 14 is a circuit unit that controls LEDs and LCDs based on instructions from the master unit control unit 19 to perform various displays to notify the user of various states such as line status, incoming call, or misplacement. .. The operation input unit 15 is a circuit unit that detects a key operation by the user. The storage unit 16 is a memory used for the processing operation of the master unit control unit 19 to store various information and programs such as an authentication code unique to the curl cordless telephone. The power supply unit 17 is a circuit unit that supplies power for charging the battery of the slave unit 2 mounted on the charging stand 1A from the charging terminal 1B. The mounting detection unit 18 is a circuit unit that detects whether or not the slave unit 2 is mounted on the master unit 1. The master unit control unit 19 has a microprocessor such as a CPU, and by reading and executing the program of the storage unit 16, the above hardware and the program are made to cooperate to control each unit of the master unit 1. It is a functional unit that performs call control and slave unit registration processing.

[Cordless handset]

Next, the handset of the curl cordless telephone according to the first embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing a configuration of a slave unit of a curl cordless telephone according to the first embodiment of the present invention. The slave unit 2 includes a wireless interface unit (hereinafter referred to as a wireless I / F unit) 21, a voice processing unit 22, a wireless ID tag 23, a display unit 24, an operation input unit 25, a storage unit 26, a charging unit 27, and a battery 20. , A state detection unit 28, and a slave unit control unit 29 are provided.

The wireless I / F unit 21 is a circuit unit that performs data communication with the master unit 1 via the wireless line 3. The voice processing unit 22 is a circuit unit having a voice call function using a speaker and a microphone (not shown) and a function of generating various notification sounds. The radio frequency identification (RFID) 23 transmits a pre-registered authentication code unique to the curl cordless telephone to the master unit 1 by performing short-range wireless communication using a predetermined wireless signal. It is a circuit part. The display unit 24 is a circuit unit that controls LEDs and LCDs based on instructions received from the master unit 1 via the wireless line 3 to perform various displays. The operation input unit 25 is a circuit unit that detects a key operation by the user. The storage unit 26 is a memory that stores various information and programs used for processing operations in the slave unit control unit 29.

The battery 20 is a circuit unit for storing the operating power used in each part of the slave unit 2. The charging unit 27 is a circuit unit that charges the battery 20 with the electric power supplied from the master unit 1 via the charging terminal 2B. The state detection unit 28 is a circuit unit that detects the on-hook / off-hook state of the slave unit 2, that is, the mounted state. The slave unit control unit 29 has a microprocessor such as a CPU, and by reading and executing the program of the storage unit 26, the above hardware and the program are made to cooperate to control each unit of the slave unit 2. It is a functional unit that performs call control and slave unit registration processing.

As a known technique, the state detection unit 28 is an example realized by a general switch such as a hook switch that operates mechanically by mounting the slave unit 2 on the master unit 1 or a photointerruptor that operates electrically. Therefore, the same switch may be used in the mounting detection unit 18 of the master unit 1. In addition, as the state detection unit 28, there is also an example of detecting the electrical connection between the charging terminals 1B and 2B used for the charging operation between the master unit 1 and the slave unit 2, and the mounting detection unit 18 of the master unit 1 also has an example. Similarly, the electrical connection may be detected.

In this case, the amount of electricity that changes due to the electrical connection between the charging terminals 1B and 2B, for example, the current value and voltage value, is taken in from the power feeding unit 17 and the charging unit 27, and the slave unit 2 with respect to the master unit 1 responds to the change. You may detect the presence or absence of the placement of. When the battery 20 of the slave unit 2 is fully charged, the charging power from the master unit 1 to the slave unit 2 becomes zero. Therefore, for example, by constantly passing a current of a predetermined value or more between the charging terminals 1B and 2B, or by applying a predetermined potential, the electrical connection between the charging terminals 1B and 2B is performed even in the fully charged state. You may detect the presence or absence of.

The wireless ID tag used in the present embodiment is composed of an IC chip that transmits an authentication code by a predetermined wireless signal in response to an activation instruction from the outside, and is widely used for identifying articles and the like. This type of wireless ID tag has a small transmission power, and the propagation distance of the radio signal can be limited by adjusting the transmission power. In the present embodiment, it is sufficient that short-range wireless communication is possible so that the wireless signal reaches the tag I / F unit 13 of the master unit 1 from the slave unit 2 at a distance where the slave unit 2 is mounted on the master unit 1. ..

[Operation of the first embodiment]

Next, the slave unit registration operation of the curl cordless telephone according to the first embodiment of the present invention will be described with reference to FIG. FIG. 4 is a sequence diagram showing a slave unit registration operation of the curl cordless telephone according to the first embodiment of the present invention. The master unit 1 and the slave unit 2 of the curl cordless telephone start the slave unit registration operation shown in FIG. 4 according to the placement of the slave unit 2 on the master unit 1. Here, a case where a new slave unit 2 is mounted on the original master unit 1 to perform a slave unit registration process of the new slave unit 2 on the original master unit 1 will be described as an example.

First, when the slave unit 2 is mounted on the charging stand 1A of the master unit 1 (step 100), the charging terminal 1B of the master unit 1 and the charging terminal 2B of the slave unit 2 are electrically connected, and the master unit 2 is electrically connected. Charging is started by the power supply unit 17 of 1 (step 101), and the battery 20 is charged by the charging unit 27 by supplying power from the master unit 1 to the charging unit 27 of the slave unit 2 (step 102). When the state detection unit 28 detects the placement on the master unit 1, the slave unit control unit 29 of the slave unit 2 refers to the internal memory or the storage unit 26 of the wireless I / F unit 21. Check if a valid authentication code is registered, that is, whether or not the master unit 1 that is paired with the slave unit 2 is registered (step 111), and if it is already registered (step 111: NO), the slave unit It is determined that registration is unnecessary (step 112), and a series of slave unit registration processes is completed.

On the other hand, when the authentication code is not registered (step 111: YES), the slave unit control unit 29 determines that the slave unit registration request is necessary, and starts the following slave unit registration process. First, the handset control unit 29 generates an authentication code unique to the curl cordless telephone or the handset registration process using, for example, a random number (step 113), and then activates the wireless ID tag 23 (step 114). , The generated authentication code is transmitted from the wireless ID tag 23 by a wireless signal (step 115). Further, the slave unit registration request including the generated authentication code is transmitted from the wireless I / F unit 21 to the master unit 1 via the wireless line 3 (step 116).

The master unit 1 receives the authentication code transmitted by the wireless signal from the wireless ID tag 23 of the slave unit 2 in the tag I / F unit 13, and requests the slave unit registration from the slave unit 2 via the wireless line 3. Received by wireless I / F section 11. The master unit control unit 19 compares the authentication code received by the tag I / F unit 13 with the authentication code received by the wireless I / F unit 11 (step 120).

Here, when both authentication codes match (step 121: YES), the master unit control unit 19 is a slave unit registration request from the slave unit 2 on which the slave unit registration request is mounted on the master unit 1. Therefore, it is determined that the registration of the slave unit is successful, and the successful registration including the authentication code is transmitted from the wireless I / F unit 11 to the slave unit 2 via the wireless line 3 (step 122). As a result, the master unit control unit 19 registers the authentication code in the wireless I / F unit 11 and the storage unit 16 as the authentication code of the slave unit 2 paired with the master unit 1, and the slave unit control unit 29. Then, the authentication code is registered in the wireless I / F unit 21 and the storage unit 26 as the authentication code of the master unit 1 paired with the slave unit 2 (step 123), and a series of slave unit registration processes is completed.

On the other hand, in step 121, when both authentication codes do not match (step 121: NO), the master unit control unit 19 sends a registration failure indicating the failure of the slave unit registration request from the wireless I / F unit 11 to the wireless line. It is transmitted to the slave unit 2 via 3 (step 130), and a series of slave unit registration processes is completed. In response to this registration failure notification, the handset control unit 29 controls the display unit 24 to display an error indicating the handset registration failure, or controls the voice processing unit 22 to cause the handset registration failure. The indicated error tone is output (step 131), and a series of slave unit registration processes is completed.

As described above, in the present embodiment, the wireless ID tag 23 is provided in the slave unit 2, and the tag I / F unit 13 that receives the authentication code notified from the wireless ID tag 23 of the slave unit 2 is used in the master unit 1. At the time of the slave unit registration process from the slave unit 2 to the master unit 1, the authentication code unique to the curl cordless phone is transmitted from the wireless ID tag of the slave unit 2 by short-range wireless communication and received by the master unit 1. By comparing the received authentication code with the authentication code notified from the slave unit 2 to the master unit 1 in the slave unit registration request, the success or failure of the slave unit registration request is judged, so it is optional for the master unit 1. The slave unit registration request from the slave unit 2 within the range where the short-range wireless communication of the wireless ID tag 23 can reach is received by the master unit 1 and the slave unit is registered. ..

Therefore, when replacing the slave unit 2, simply placing a new slave unit 2 on the original master unit 1 causes the slave unit 2 to be automatically associated with the master unit 1 and a new child of the master unit 1. It can be used as machine 2. As a result, the slave unit can be easily replaced without the need for a dedicated connector or complicated operation as in the past. In addition, the propagation distance of short-range wireless communication performed by the wireless ID tag 23 is set to a distance near the master unit 1, for example, a distance less than or equal to the interval at which the master unit of each curl cordless telephone is installed, and further, the slave unit is attached to the master unit 1. By limiting the distance in the state where 2 is placed, high stability can be obtained for the slave unit registration process.

[Second Embodiment]

Next, the curl cordless telephone according to the second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a sequence diagram showing a slave unit registration operation in the curl cordless telephone according to the second embodiment of the present invention, and the same or equivalent parts as those in FIG. 4 described above are designated by the same reference numerals.

In the first embodiment described above, the slave unit registration process when the slave unit is replaced has been described as an example, but in the present embodiment, the slave unit registration process when the master unit is replaced will be described. The configurations of the master unit 1 and the slave unit 2 are the same as those in FIG. 1 described above, and the description thereof is omitted here.

First, when the slave unit 2 is mounted on the charging stand 1A of the master unit 1 (step 100), the charging terminal 1B of the master unit 1 and the charging terminal 2B of the slave unit 2 are electrically connected, and the master unit 2 is electrically connected. Charging is started by the power supply unit 17 of 1 (step 101), and the battery 20 is charged by the charging unit 27 by supplying power from the master unit 1 to the charging unit 27 of the slave unit 2 (step 102). The master unit control unit 19 of the master unit 1 refers to the internal memory or the storage unit 16 of the wireless I / F unit 11 in response to the mounting detection of the slave unit 2 by the mounting detection unit 18, and is a valid authentication code. Is registered, that is, whether or not the slave unit 2 that forms a pair with the master unit 1 is registered (step 140), and if it is already registered (step 140: NO), it is determined that the slave unit registration is unnecessary. Then (step 141), a series of slave unit registration processes are completed.

On the other hand, if the authentication code is not registered (step 140: YES), the master unit control unit 19 determines that the slave unit registration request is necessary, and instructs the slave unit 2 to start the slave unit registration process. The machine registration start instruction is transmitted from the wireless I / F unit 11 to the slave unit 2 via the wireless line 3 (step 142). In response to this, the slave unit 2 receives the slave unit registration start request from the master unit 1 by the wireless I / F unit 21. The slave unit control unit 29 starts the same slave unit registration process as in FIG. 4 and step 112 described above in response to the reception of the slave unit registration start instruction in the wireless I / F unit 21.

As a result, the master unit control unit 19 registers the authentication code in the wireless I / F unit 11 and the storage unit 16 as the authentication code of the slave unit 2 paired with the master unit 1, and the slave unit control unit 29. Then, the authentication code is registered in the wireless I / F unit 21 and the storage unit 26 as the authentication code of the master unit 1 paired with the slave unit 2 (step 123), and a series of slave unit registration processes is completed.

As described above, in the present embodiment, if the slave unit is not registered in response to the mounting detection of the slave unit 2 by the mounting detection unit 18 by the master unit control unit 19 of the master unit 1, the slave unit Was instructed to start the slave unit registration process, and the slave unit registration was started in the slave unit 2 in response to this, so the slave unit registration request from the slave unit 2 mounted on the master unit 1 was made. The handset can be registered accordingly. Therefore, when replacing the master unit 1, simply placing the original slave unit 2 on the new master unit 1 causes the slave unit 2 to be automatically associated with the master unit 1, and the new master of the slave unit 2. It can be used as machine 1. As a result, the master unit can be easily replaced without requiring a dedicated connector or complicated operations as in the past.

[Third Embodiment]

Next, the curl cordless telephone according to the third embodiment of the present invention will be described. In the first and second embodiments described above, a case where the slave unit registration process is started when the slave unit 2 is placed on the master unit 1 has been described as an example. In the present embodiment, a case where the slave unit registration process is started in a state where the slave unit 2 is close to the master unit 1 will be described. The configurations of the master unit 1 and the slave unit 2 are the same as those in FIG. 1 described above, and the description thereof is omitted here.

In the case of the present embodiment, for example, in the slave unit registration process for replacing the slave unit 2 described in the first embodiment (see FIG. 4), the replaced new slave unit 2 is replaced with the original master unit 1. In a state where the wireless ID tag communication is possible, the slave unit 2 performs a specific operation such as turning on the power of the slave unit 2 or operating a special key. Correspondingly, steps 100 to 102 and 110 in FIG. 4 may be omitted, and if the specific operation is detected by the slave unit 2 in step 111 and the pairing is not registered, the processes after step 113 may be executed.

Further, in the slave unit registration process when the master unit 1 is replaced as described in the second embodiment (see FIG. 2), wireless ID tag communication is possible with the new master unit 1 in which the original slave unit 2 is replaced. Perform a specific operation such as turning on the power of the master unit 1 or operating a special key on the master unit 1 while the master unit 1 is brought close to the distance. Correspondingly, steps 100 to 102, 110 in FIG. 5 may be omitted, and if the specific operation is detected by the master unit 1 in step 140 and the pairing is not registered, the processes after step 142 may be executed.

As described above, in the present embodiment, the presence / absence of registration of the slave unit and the master unit is confirmed based on a specific operation, and the slave unit registration process is started according to the non-registration of the slave unit. The slave unit registration process can be started by any specific operation without mounting the slave unit.

[Extension of each embodiment]

In each of the above embodiments, as another condition for starting the slave unit registration in the slave unit 2, a condition that the slave unit registration process is performed only immediately after the start of power supply to the master unit 1 may be added, which is an unnecessary error. Registration can be suppressed more accurately. For example, in each embodiment, the slave unit registration start instruction is transmitted to the slave unit 2 in response to the start of power supply in the master unit 1, and when the slave unit registration start instruction is received, the slave unit control unit 29 receives the slave unit registration start instruction. It is also possible to confirm the mounting on the master unit 1 and the unregistration of the master unit 1 and start the slave unit registration process.

Further, the slave unit control unit 19 may accept only the first slave unit registration request from the start of power supply to the master unit 1 or only the slave unit registration request within a predetermined period from the start of power supply. Further, in each embodiment, a case where the master unit has a call control function and an operation function and is applied to a curl cordless telephone in which the slave unit is controlled as a handset has been described as an example, but the present invention is not limited thereto. For example, it can be applied to cordless telephones having other configurations in which the master unit has only a basic relay function and the slave unit has a call control function and an operation function as a telephone.

<figref num="1">It is explanatory drawing which shows the schematic structure of the curl cordless telephone which concerns on 1st Embodiment of this invention.</figref><figref num="2">It is a block diagram which shows the structure of the master unit of the curl cordless telephone which concerns on 1st Embodiment of this invention.</figref><figref num="3">It is a block diagram which shows the structure of the handset of the curl cordless telephone which concerns on 1st Embodiment of this invention.</figref><figref num="4">It is a sequence diagram which shows the cordless handset registration operation of the curl cordless telephone which concerns on 1st Embodiment of this invention.</figref><figref num="5">It is a sequence diagram which shows the cordless handset registration operation of the curl cordless telephone which concerns on 2nd Embodiment of this invention.</figref>

Code description

1 ... Master unit, 1A ... Charging stand, 1B ... Charging terminal, 1L ... Line, 10 ... Line I / F section, 11 ... Wireless I / F section, 12. .Voice processing unit, 13 ... tag I / F unit, 14 ... display unit, 15 ... operation input unit, 16 ... storage unit, 17 ... power supply unit, 18 ... mounting Detection unit, 19 ... Master unit control unit, 2 ... Slave unit, 2B ... Charging terminal, 20 ... Battery, 21 ... Wireless I / F unit, 22 ... Voice processing unit, 23 ... Tag I / F section, 24 ... Display section, 25 ... Operation input section, 26 ... Storage section, 27 ... Charging section, 28 ... Status detection section, 29 .. .Slave unit control unit, 3 ... wireless line.