JPH07120974B2 - Terminal device for land mobile wireless data communication - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal device for land mobile radio data communication (teleterminal communication).

Conventional technology In general, in teleterminal communication, in addition to basic packet communication services, high-speed polling and image communication are performed.
Data transmitted and received via a wireless line is connected to a facsimile machine and various information devices to provide various services. By the way, in this case, as the tele-terminal wireless terminal device, after performing communication control of the calling process and the incoming process,
Until the next communication is completed and the disconnection process is performed, it is necessary to deliver the data transmitted and received wirelessly to an externally connected facsimile machine or other information device. Conventionally, the data is delivered in an unprocessed state. There is.

However, even if it is raw data, data communication generally performed by wire communication is sent from LSB (least significant bit) first for each octet (information unit consisting of 8 bits). It is customary, however, that the radio procedure of the teleterminal is defined to send MSB (most significant bit) first, so it may not be possible to interface well with externally connected facsimiles and other information devices.

It is an object of the present invention to provide an excellent terminal device for teleterminal communication, which can eliminate the above-mentioned interface defects that occur when connecting to such an external information device.

Means for Solving the Problems The present invention is configured such that data transmitted and received in order to achieve the above object is exchanged in order of LSB and MSB for each octet.

Operation Therefore, according to the present invention, it is not necessary to use a special device as an externally connected device, and there is an effect that a normal device can sufficiently perform teleterminal communication.

Embodiment FIG. 1 shows a data format used in teleterminal communication. As shown in FIG. 1 (a), the signal sent from the teleterminal base station has data sent after the bit sync signal and the frame sync signal in order to establish reception synchronization. The actual code is 1010 as a bit synchronization signal.
A 16-bit code such as 5AC9 (hexadecimal number) is used as a repeating signal of 1s and 0s as in 10 ... And a frame synchronization signal. As shown in FIG. 1 (b), the present invention divides the data into 8 bits immediately after receiving the frame synchronization signal, and outputs the data for each octet as LSB and MSB.
The order is changed, and the data as shown in FIG. 1 (c) is output to the external information device.

Next, one embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a schematic configuration diagram of an embodiment of a teleterminal communication terminal device of the present invention. The control unit 4 controls communication connection such as incoming and outgoing calls.
After that, the information device 8 connected to the outside starts communication using the set wireless line. The transmission data output from the information device 8 is divided into 8 bits from the beginning of the data by the LSB / MSB inverse canonical circuit (order change circuit) 5 and the order of the most significant bit and the least significant bit is interchanged. It is transmitted through the antenna 1. On the other hand, the data received from the antenna 1 is demodulated by the receiving unit 3 and then waits for the arrival of the frame synchronization signal by the frame synchronization detection circuit 7, and as soon as the frame synchronization signal is detected, the LSB / MSB inverse circuit. 6 is started, and the following data is divided into 8 bits,
The order of LSB and MSB is changed, and the result is output to the external information device 8.

EFFECTS OF THE INVENTION As described above, the teleterminal communication terminal device of the present invention converts the most significant bit first data stream in the wireless section into the least significant bit first data stream common to general information equipment. Since it sends and receives by sending and receiving, there is no need to prepare a special information device to connect to the outside,
It has an advantage that various kinds of communication can be performed at low cost, and it is very useful for widespread use of teleterminal communication.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a frame synchronization signal and LSB / MSB bit permutation for each octet in land mobile radio data communication, and FIG. 2 is a schematic configuration diagram of an embodiment of a land mobile radio data terminal device of the present invention. is there. 1 ... Antenna, 2 ... Transmitter, 3 ... Receiver, 4 ...
Control unit, 5 ... LSB / MSB reverse order circuit, 6 ... LSB / MSB reverse order circuit, 7 ... Frame synchronization detection circuit, 8 ... External information equipment.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Naoya Morita 4-3-1 Tsunashima East, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd. (72) Inventor Yasuhiro Tsukui 3-1-1 Asahigaoka, Hino-shi, Tokyo (72) Inventor Tetsuya Hanawa 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu Limited (72) Inventor Hiroshi Takegaki 8-1-1 Tsukaguchihonmachi, Amagasaki City, Hyogo Prefecture Ryo Electric Co., Ltd.

Claims (1)

[Claims] 1. When delivering unprocessed data transmitted and received on a wireless line to a device connected to the outside, the transmission order of the most significant bit and the least significant bit of the data is detected every 8 bits after detecting a frame synchronization signal. A terminal device for land mobile radio data communication, which is provided with means for transmitting data in reverse.