JPH0345939B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a wireless data transmission device for a multi-channel access system (hereinafter referred to as MCA system).

(Prior Art) The MCA system is composed of a command station and a mobile station that conduct telephone calls, and a control station that controls and relays these telephone calls. Figure 1 shows the conventional example.
The connection and configuration between the MCA radio and the terminal device of the MCA system are shown. In the figure, 1 is an MCA radio, 2 is an interface section, a control section,
A communication control device consisting of a MODEM section, 3 a terminal device, 4 a CPU, 5 a program ROM,
6 is a storage element (IDROM), 7 is a RAM, 8 is an input/output device, 9 is a modem (MODEM), and 10 is a wireless section. The line connection of this MCA system is performed by digital data transmission using a dedicated control channel (Cch). Therefore, the radio equipment of the command station and mobile station is equipped with a modem 9 for digital data transmission.
Built-in CPU4. Furthermore, a communication channel (Sch) different from Cch is designated by the control station, and data transmission can be performed using signals within the voice band. In Cch, the control signal is modulated and demodulated by the modem 9 in the MCA radio 1, and at the time of transition to SCT, the audio line is passed to the communication control device 2, and the data transmission is modulated and demodulated by the communication control device 2.
This is carried out by the MODEM section, and communication control is also carried out by the CPU in the communication control device 2 (the control section is constituted by the CPU).

However, when configuring the data transmission system in this conventional example, a communication control device including a modem is added outside the MCA radio device 1, which makes the system expensive and complicated.
It was difficult to easily connect the data terminal device 3 to the MCA radio device 1.

(Object of the invention) The object of the present invention is to solve the problems in the past,
This allows a data terminal device to be easily and inexpensively connected to an MCA radio, and allows data transmission to be performed easily, and will be explained in detail below.

(Structure of the Invention) The present invention provides a wireless data transmission device for multi-channel access under program control, which includes a microprocessor, a wireless device control storage section, a modem, and a wireless section. This is a mobile wireless data transmission device characterized in that a connection serial interface device is connected to a system bus.

(Embodiment) FIG. 2 is a configuration diagram of a mobile station of an MCA data transmission system according to an embodiment of the present invention. In the figure, 3 is a data terminal device, 11 is an MCA radio,
16 is an on-vehicle antenna. Data terminal device 3
and the MCA radio device 11 are connected via a serial interface 17. The signal line and control line of this serial interface 17 are EIA standard.
Compliant with RS-232C, electrically 0
~5V TTL level is used. Further, the data terminal device 3 is equipped with a keyboard, a liquid crystal display, and a printer, and is configured to input, display, record, etc. data. Both parties exchange signals in start-stop synchronization, and the data input from the data terminal device 3 is transmitted to the command station via the MCA radio 11 and the on-vehicle antenna 16, and the data sent from the command station is Data is received by the MCA radio 11 and displayed on the data terminal device 3.

Figure 3 is a block diagram centered on the MCA radio device 11, where 4 is the CPU and 5 is for the program.
ROM, 6 is a storage device (IDROM) that stores the group code to which the mobile station and the command station belong, zone parameters of the system that can receive services, etc.; 7 is RAMa used for the original function as a radio; 8 is an input/output device, 9 is an MSK used for data transmission as well as normal line control.
(Minimum Shift Keying) modem, 10 is a wireless section, 12 is a serial interface device, 14
3 is a data terminal device connected to the serial interface device 12; Conventional MCA radio device 1 shown in Figure 1
The difference is that serial interface device 1
2 and data routing RAMb 14 were newly installed on the bus (the communication control device in FIG. 11 was deleted) and connected to the data terminal device 3 and the serial interface device 12. The data input from the data terminal device 3 is transmitted to the serial interface device 1.
2, the data is transferred to the RAMb 14 under the control of the CPU 4, and then transmitted to the command station by the input/output device 8, modem 9, and wireless section 10.

FIG. 4 is a detailed explanatory diagram of the serial interface device 12. In the figure, 18 is a programmable communication interface LSI that can be directly connected to a bus line, 19 is an inverter installed so that the signal line is negative logic and the control line is positive logic on the interface line, and 20 is a connector. This is the terminal section. Generally, the RS-232C interface is between a MODEM device and a terminal device, and in this embodiment, the MCA wireless line 11 is
It can be considered as the MODEM device side. Received data and transmitted data have a length of 7 bits/character, and a parity bit is added to the total
Consists of 8bit/character. Then, data is sent and received in units of frames consisting of a plurality of characters. Parity check and frame error check are performed using communication interface LSI.
18 performs the process, and the CPU 4 can know the result via the system.

When data is entered from the mobile station to the command station, first the data terminal device 3 on the mobile station side enters the MCA.
Data is registered in the radio device 11, and this procedure will be explained using the flowchart in FIG. When a data registration request is received from the data terminal device 3,
The serial interface device 12 in the MCA radio 11 serially transmits data character by character.
Reading is performed while performing parallel exchange, and at the same time a parity check and a frame error check are performed. If there is no error, the CPU 4 stores the received data in the buffer RAMb14. Data input and RAMb until the END character is received.
14 is performed, and when it is completed normally (when the error flag is 0), a registration completion signal is sent to the data terminal device 3 and the Cch acquisition operation begins. When the data is correctly registered and Cch acquisition is performed, a connection request signal is sent to the control station by the pre-talk switch in the same way as in normal calling operations. When the line connection is established and the process shifts to Sch, the command station is called with an individual call signal, the data registered in the buffer RAMb 14 is transmitted, and the data entry process on the mobile station side is completed.

Next, FIG. 6 shows the processing procedure of the MCA radio device 11 when the mobile station receives data. The received data is stored in buffer RAMb14 of MCA radio 11.
A lump sum will be paid to . Next, the MCA radio 11 sends a transfer request signal to the data terminal device 3, and when the transfer permission signal is received, the MCA radio device 11 sends a transfer request signal to the data terminal device 3.
Transfer the transaction data of RAMb14. When the data transfer to the data terminal device 3 is completed, the MCA radio device 11 moves to a Cch acquisition operation.

As explained above, in this example
Since a serial interface device 12 compliant with RS-232C is installed in the MCA radio device 11, it is possible to connect various data terminal devices such as a hand-held terminal device, a personal computer, a handle-held computer, and a printer. This has the advantage that the transmission system can be easily configured. In addition, since RAMb14 for data transmission is provided on the system bus of the MCA wireless line 11 in addition to RAMa7 for original radio control, the calling side transfers data from the data terminal device 3 in advance before making a call.
It becomes possible to register the received data in the MCA radio device 11, and even if the called party is not present, the sent data can be stored and the received data can be known at any time using the data terminal device 3.

Further, the MCA radio device 11 according to this embodiment can be applied as follows. Since the radio unit 10 of the MCA radio device 11 is controlled by the internal CPU 4, the various performances of the radio device itself cannot be measured manually. Therefore, as shown in Figure 7,
MCA radio device 11 and personal computer 22
A level converter 21 that converts between the 5V TTL level and the RS-232C level is installed and connected, and commands such as transmission status, reception status, channel designation, etc. are sent from the personal computer 22 to the inside of the radio via the serial interface. Testing and maintenance can also be performed by supplying it to the CPU 4. It can also be used with automatic measurement systems.

(Effect of the invention) The wireless data transmission device for MCA (MCA radio) according to the present invention has an internal serial interface device compliant with RS-232C and a RAM for data routing connected to the system bus, and is used for controlling the radio. Since it is controlled by the same CPU as the MCA radio, it has the advantage of being able to connect various types of data terminal devices at low cost and easily, creating a data transmission system using MCA radio equipment with excellent performance and economy. can do.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the connection and configuration between an MCA radio and a terminal device in a conventional example, FIG. 2 is a configuration diagram of a mobile station of an MCA data transmission system in an embodiment of the present invention, and FIG. 3 is an MCA radio 4 is a detailed explanatory diagram of the serial interface device 12, FIG. 5 is a flowchart showing the procedure for registering data from the data terminal device 3 to the MCA radio device 11, and FIG. 6 is a block diagram centering on the MCA radio device 11. 7 is a flowchart showing the processing procedure of the MCA radio device 11 when a mobile station receives data, and FIG. 7 is a block diagram showing an application example of the MCA radio device 11. 3...Data terminal device, 4...CPU, 5...
Program ROM, 6...Storage element (IDROM), 7...RAMa, 8...I/O device,
9...modem (MODEM), 10...wireless section, 1
1...MCA radio device, 12...serial interface, 14...RAMb, 16...vehicle antenna, 17...serial interface, 1
8...Programmable communication interface
LSI, 19... Inverter, 20... Connector terminal section.

Claims (1)

[Claims] 1 A system bus of a mobile radio telephone for multi-channel access consisting of a microprocessor, a memory for controlling a radio device, a modem, and a radio device is provided with a memory for data storage and a serial interface device for connecting to a data terminal device. , a mobile wireless data transmission device characterized in that it is capable of wireless telephone and wireless data transmission.