JPH05103048A - Serial data converter for data system - Google Patents

Abstract

PURPOSE:To observe directly a transmission signal on a communication line of the serial transmission system by providing a signal detection means and a signal conversion means converting a signal detected by the signal detection means into a parallel signal and detecting a signal type and a signal fault, to the converter. CONSTITUTION:The converter is provided with a signal detection section 20 detecting a transmission signal on a serial communication line 1 interconnecting system computers and a signal conversion section 40 converting the signal detected by the signal detection section 20 into a parallel signal and detecting a signal type and a signal fault. Through the constitution above, the signal detection section 20 detects a transmission signal of the serial communication line 1 in conformity with the MIL-STD and sends it to the outside and the signal conversion section 40 demodulates the transmission signal and converts the signal into a parallel signal and detects the presence of a fault of the transmission signal. Thus, it is possible to observe the content of the transmission signal directly and surely from the serial communication line 1 in compliance with the MIL-STD.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data system serial data converter.

[0002]

2. Description of the Related Art As a high-speed data link for interconnecting system computers used in a Navy Tactical Data System in a ship, US Department of Defense standard MIL-STD-1397
B, TYPE-D and TYPE-E (hereinafter MIL-ST
A communication line of a serial transmission system conforming to (D.) is known. Here, the system computer is provided in various subsystems in the ship to control the entire system of itself, and to control the entire subsystem as a whole in the information processing system and other related subsystems and high speed. The data is exchanged in. However, MIL-STD compliant serial transmission type communication lines are used for communication between these system computers, communication between the system computers and computers in the information processing system, and data transmission between these computers and their peripheral devices. The contents of communication include, for example, conversion of each system status, position of other vessels,
This includes information such as speed and operating instructions from the upper system to the lower system.

However, such MIL-STD
In the case of observing the data transmitted through the line in the communication line of the serial transmission system conforming to the standard, there is no effective means to observe the transmission data directly from the line transmission signal. Although the transmission data is indirectly observed from the signal, this method does not directly observe the actual transmission signal on the communication line, so the failure of the interface device itself or the communication line itself cannot be clearly detected. Moreover, when the signal cannot be taken out from the inside of the device, there is a problem that the transmission data on the communication line of this system cannot be observed.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of such circumstances, and enables direct connection to a communication line of a serial transmission system and direct observation of a transmission signal. It is an object of the present invention to provide a serial data converter for a data system that operates.

[0005]

To this end, the present invention provides a signal detecting means for detecting a transmission signal on a serial transmission type communication line connecting system computers, and a signal detected by the signal detecting means in a parallel signal. And signal conversion means for detecting the signal type and the signal abnormality.

[0006]

In the serial data converter of the data system of the present invention, by separating the transmission signal detecting means and the serial / parallel signal converting means via the transmitting means, the detecting means can be downsized and can be connected to the communication line. In addition to facilitating the connection, the influence of the instrument on the communication line to be observed can be minimized by shortening the connecting cable and separating it from the conversion means. Further, the dedicated signal converting means enables high speed demodulation and parallelization of the modulation signal peculiar to MIL-STD and detection of signal abnormality.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, one embodiment of the serial data converter of the data system of the present invention will be described.
It is a block diagram which shows the serial data converter for communication lines of the serial transmission system based on -STD.

In FIG. 1, the serial data converter is
It is composed of a signal detection unit 20 that detects and sends a transmission signal on the serial communication line 1 laid inside the ship, and a signal conversion unit 40 that receives the sent signal, demodulates it, and then converts it into a parallel signal. It Therefore, in the signal detection unit 20, the input buffer 21 prevents the influence on the serial communication line 1 caused by the connection of this device. Wave shaper 22
ECL signal 31 of TYPE-D and TYPE-E
The signal waveform is shaped in addition to being converted into the signal 32 of the (Emitter Coupled Logic) level. The edge detector 23 detects the presence or absence of a signal on the line and generates a DATA ENABLE signal 33. In addition to controlling the output gate 24, this is sent to the signal converter 40 as the signal detector output signal 35 by the transmitter 25 together with the detection signal output 34.

Next, in the signal conversion unit 40, the receiver 41 converts the transmitted signal into the ECL level signal 61 again, and the NRZ demodulator 43 and the clock extractor 4
Distribute into 2. The NRZ demodulator 43 demodulates Manchester code modulation received by the transmission signal on the communication line. The clock extractor 42 generates a clock synchronized with the signal and supplies it as a reference clock 62 of the signal conversion unit 40 to various places. The 36-bit shift register 44 converts the demodulated serial signal 74 into a 36-bit parallel signal 75 and outputs it as a parallel data output 72 through the latch 47 and No1 buffer 50. On the other hand, the frame length bit counter 45 and the frame end detector 46
Detects the length and end of the transmission signal and outputs it to the timing generator 49. The frame status detector 48 identifies the type of transmission signal on the communication line and outputs the CF / IF signal 67. The timing generator 49 controls the output timing of the parallel data output 72, and also outputs the frame status output 73 such as the presence / absence of the transmission signal and the type thereof through the No2 buffer 51.

The parallel data output 72 and the frame status output 73 are used for analysis in the analysis system as follows, for example. That is, parallel data output 7
2 is sent to the logic analyzer for observation, and the frame status output 73 is input to the logic analyzer or displayed on the LED. As a result, the adjustment test of each device of the communication system can be performed while analyzing and confirming the content of the transmission signal on the serial communication line 1.

Thus, according to this device, the MIL-S
The transmission signal of the serial communication line 1 conforming to TD is detected by the signal detection unit 20 and transmitted to the outside, and the signal conversion unit 4
When 0, the transmission signal is demodulated and converted to parallel, and the presence or absence of an abnormality in the transmission signal is detected.
It is possible to directly and surely observe the contents of the transmission signal from the serial communication line 1 conforming to the above.

[0012]

In summary, according to the present invention, the signal detecting means for detecting the transmission signal on the serial transmission type communication line connecting the system computers and the signal detected by the signal detecting means are converted into parallel signals. The serial data conversion of the data system which enables direct connection to the communication line of the serial transmission system and direct observation of the transmission signal by having the signal conversion means for detecting the signal type and the signal abnormality Because I get a vessel
The present invention is extremely useful in industry.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a serial data converter of a data system of the present invention.

[Explanation of symbols]

 1 serial communication line 20 signal detector 21 input buffer 22 waveform shaper 23 edge detector 24 output gate 25 transmitter 40 signal converter 41 receiver 42 clock extractor 43 NRZ demodulator 44 36bit shift register 45 frame length bit counter 46 frame end Detector 47 Latch 48 Frame status detector 49 Timing generator 50 No1 buffer 51 No2 buffer

Claims (1)

[Claims] 1. A signal detecting means for detecting a transmission signal on a serial transmission type communication line connecting between system computers, a signal detecting means for converting the signal detected by the signal detecting means into a parallel signal, and a signal type and a signal abnormality. A serial data converter for a data system, comprising: a signal converting means for detecting.