JPH0326629Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] This invention relates to an intermediate connector that enables mutual data transmission between DTE interfaces conforming to the RS232C standard and the temporary suspension of data transmission in a busy state. [Background technology and its problems] The RS232C standard was established by the Electronic Industries Association (EIA) and is an electrical and physical specification for transmitting bit serial data between data processing devices. It specifies handshake signals for controlling connected devices and modems. This RG232C standard interface (DTE
For example, as shown in Figure 1, the output data of a computer or peripheral device A is
Connect to modem D via DTE type interface B and DTE type interface C,
It is used when transmitting modulated data to communication line E, and is widely used internationally. This interface B (DTE type) and C
(DCE type) connector has ₂₅ pins or pin holes arranged in two rows as shown in Figure 2.
The configuration is such that cable L is connected to P ₂₅ , but it is rare that all 25 pins are used, and typical examples are those with corresponding pin numbers and input/output signals as shown in the table below. (The following description is based on this table.)

[Conventional example]

Conventionally, in such cases, the wire connection style is changed as shown in FIG. 3. In other words, connect pin number 2 of one connector A and pin number 3 of the other connector B, connect pin number 2 of the other connector B to pin number 3 of one connector A, and connect pin number 4 of each connector A and B. .5,6,
8 and 20 are short-circuited. (Auto-loopback type) This auto-loopback type connection specification makes it possible to send and receive data, but because the busy signal (pin 5) is not transmitted to the other connector, it is not a condition for the device to accept data. Data will be sent even if there is no such device (busy state), and a failure will occur in which part of the data will be lost on the way. Therefore, if the pin numbers of both connectors A and B (both DTE type) are connected as shown in Figure 4, the busy signal will also be transmitted to and from the computer without going through modem D. Transmission of peripheral device data should occur. (called a null modem). However, even in this case, if the peripheral device is a device that only receives data from the computer side, such as a printer, data transmission is not performed, so the transmission request continues to be output, and when the device is in a busy state, only the data terminal ready pin is used to process the computer. This is often communicated to the machine. Conversely, on the computer side, the output of the data terminal ready pin may transmit a busy signal while data is being transmitted. At that time, with the null modem type shown in Figure 4, the peripheral device outputs a transmission request even though it is busy, causing the computer to transmit data and losing data, or the computer outputs a busy signal when transmitting data. Therefore, problems such as peripheral devices not outputting transmission requests may not be resolved. [Purpose of the invention] This invention was made in view of the actual situation, and creates a condition in which if one device is only capable of receiving data, it can always receive data, and the transmitting side can also send a busy signal. This provides an intermediate connector for DTE interface with asymmetrical connection specifications. [Embodiment] Hereinafter, an embodiment of the intermediate connector for DTE interface of this invention will be described based on the drawings. Figures 5a, b, c, and d show a left side view, a plan view, a right side view, and an elevation view of an intermediate connector for a DTE interface showing an embodiment of the present invention, and show the left side view of the connector. 25 with RS232C specification to a
25 pin holes H ₁ to H ₂₅ are provided, and 25 pins P ₁ to P ₂₅ are similarly provided on the right side c. And these pin holes H ₁ ~ _{H 25} and pins P ₁ ~
A portion of P ₂₅ has four wires that terminate each other.
Connected by W ₁ to W ₄ . This connection specification is as shown in Figure 6 _.
and pin P ₁ with wire W ₁ , connect pin hole H ₂ and pin P ₃ with wire W ₂ , and connect pin holes H ₅ , H ₆ , H ₈
Connect with a short circuit and connect pin P ₂₀ with wire W ₃ , then connect pin hole H ₇ and pin P ₇ with wire W ₄ , and connect pins P ₄ , P ₅ , P ₆ , and P ₈ with a short circuit. There is. Mold part _M1 with pin holes _H1 to _H25 and pins _P1 to _P25
It is preferable that the molded part _M2 is fixed by a connecting plate or a housing G as shown in FIGS. 5b and 5d. Since the intermediate connector for the DTE interface of this invention is constructed as described above, the interface input/output signals on the computer side are connected to the pin holes _H1 to _H25 using the DTE type connector.
DTE printer for example dedicated to receiving pins P ₁ to P ₂₅
When connected using a type connector, the transmission request signal output from the printer side is short-circuited from pin P ₄ to pin P ₅ , pin P ₆ , and pin P ₈ on the printer side, so the printer always receives received data. will be in the acceptance state. Therefore, in this state, data can always be received from the computer side. Also, when the printer side becomes busy, the signal on pin _P20 changes, so this signal is supplied to pin holes _H2 , _H6 , and _H8 on the computer side, and the computer side indicates that the printer is busy. You can recognize that you have reached the state of Therefore, the computer side temporarily stops data transmission and waits for the printer side to come out of the busy state, and when the printer side is no longer busy and a transmission request from the printer is output from pin _P4 , the computer side will send the data again at this point, so no data will be lost. When the printer side interface is temporarily disconnected from the line, that is, in an offline state, pin P ₂₀
Since the signal is at the same level as the busy state, the computer knows that the printer is offline, and the computer will not send data until the printer is online. Then, when the busy state (offline) is released, data is sent from the computer side to the printer side via pin hole _H2 and pin _P3 . Note that the intermediate connector of this invention can also have pins P ₁ to _{P 25} on the left side of Fig. 5a (P-P
(type), the right side of FIG. 5c has pin holes H ₁ to H ₂₅ (H-H type). Furthermore, it is also possible to have the right and left interchanged (PH type). Also, extend the length of wires _W1 to _W4 and insert them into the pin holes.
A configuration may be adopted in which the distance between H ₁ to H ₂₅ and the pins P ₁ to _{P 25} is widened. However, the length may not exceed 15m. Above, we have explained the intermediate connector for DTE interface of RS232C standard, but this invention is
It can also be applied to intermediate connectors with CCITTV and 24 standard specifications, which are similar to the RS232C standard. That is, CCITTV, 24 and RS232C standards both consist of 25-pin connectors, and the pin numbers and the types of signals corresponding to the pin numbers are the same. However, pin numbers 9 and 1 in the RS232C standard
0 (test voltage terminal) is omitted in the CCITTV and 24 standards, but in the typical specifications shown in the table above, pin numbers 9 and 10 are missing, so there is no problem even if they are considered to be the same standard. [Effects of the invention] As explained above, the intermediate connector for DTE interface of this invention uses two RS232C standard connectors, and pin numbers 1-1 and 2 of both are used.
-3, 7-7, 5, 6, 8-20, and pin numbers 4, 5, 6, 8 of one connector.
This configuration allows for a short-circuit connection between a peripheral device dedicated to data reception and a transmitting/receiving data device, such as a computer, without losing data, and also temporarily suspends data transmission when the device is busy. This has the effect of making it possible to

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing a typical connection type according to the RS232C standard, Figure 2 is a perspective view of a typical 25-pin connector, Figure 3 is a connection circuit diagram showing auto-loopback type connection specifications, Figure 4 The figure is a connection circuit diagram showing the connection specifications of the null modem type, Figure 5 a, b,
c and d are a left side view and a plan view showing an embodiment of the intermediate connector for DTE interface of this invention;
The right side view, the elevation view, and FIG. 6 are connection circuit diagrams showing the connection specifications of this invention. In the figure, H ₁ to _{H 25} are pin holes, P ₁ to _{P 25} are pins, and W ₁
~W ₄ is a connecting wire, M ₁ , M ₂ are molded parts of the connector, and G is a connecting plate.

Claims (1)

[Scope of Claim for Utility Model Registration] The first connector pin corresponding to the receiving-only terminal device side and the second connector pin corresponding to the terminal device side capable of transmitting data are defined in the following (a) to
It is characterized by having the connection configuration of (e).
Intermediate connector for DTE interface conforming to RS232C standard. (a) Connection between the safety ground pins of the first and second connectors (b) Connection between the signal ground pins of the first and second connectors (c) Connection between the data transmission pin of the second connector and the first connector (d) Connection of the data reception pin of the first connector (e) Short-circuit connection between the transmission request pin, transmission permission pin, data set pin, and data carrier detection pin of the first connector (e) Connection of the transmission permission pin, data set read of the second connector Connect the data terminal ready pin of the first connector by short-circuiting the pin and the data carrier detection pin.