JPS6069763A - Transfer system for group control data - Google Patents

Abstract

PURPOSE:To allow an inexpensive CPU to perform group control data transfer by connecting (n) sets of terminal devices (TRM) to the CPU in parallel through one dedicated interface. CONSTITUTION:An identification code which can identifies only a selected TRM is added as part of command data (CMDDATA) sent from the CPU60 first. When the CPU sends this CMDDATA to all TRMs, only the selected TRM identifies itself to be selected and returns the received CMDDATA to the CPU60 as it is through M/D, a transmission line, and an RS232C interface 70. The CPU 60 collates the returned CMDDATA with the previously sent CMDDATA to transmit following one block of data to all the TRMs when the both coincide with each other, and the selected TRM receives and returns the data as it is to the CPU60, which performs collation similarly. Thus, the data transfer is carried on successively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a group control data transfer system, and in particular, the present invention relates to a group control data transfer method, and in particular, a central processing unit such as a personal computer that does not have input/output ports equal to the number of controlled terminal devices and does not have a time-division data transfer function. The present invention relates to a one-to-n group control data transfer method in which data is transferred by controlling n terminal devices in a group via a dedicated interface.

A conventional data transfer method will be explained with reference to FIG. Figure 1(a) is a block diagram showing an example of a conventional data transfer method, and Figure 1(b) is a sequence of transfer operations between the central processing unit and one terminal device in Figure 1(a). It is a time chart showing an example. In the same figure,
The central processing unit (hereinafter referred to as CPU) io is a human output port for transferring n data. For example, R8232C interface (modem dedicated interface) 20. ~2n yo Simodem (hereinafter referred to as M/D) 30. .about.3n, and further connected to the transmission line and the M/D30. M/I facing ~3n)4
Terminal device (hereinafter referred to as T-M) 'I' via 0゜~4n
几M.

50, to TRMn5n. In this data transfer method, CPU10 first transfers data to the controlled TRM (for example, TRM
, 50) is activated only to the hind limb TRM 150 that has selected activation signal 5.
When ENODR-i is sent, TRM150 sends a confirmation signal (
A positive response (ACK or negative response NACK) is returned.

When C'PUI O receives the acknowledgment 亚X, it transmits 1 block worth of data DATAO. Also negative response N
When receiving the ACK, the OTTM 1150 repeatedly transmits the activation signal 5ENODR or outputs a status message depending on the content of the ACK, and the OTTM 1150 outputs the data DA.
When TAO is received, it is determined whether there is an error in the received data using the parity-2 group coefficient, etc., and an affirmative response A is similarly sent based on the determination result.
CK or negative acknowledgment NACK is returned. CPU10
TRM when receiving the acknowledgment ACK.

50 recognizes that the data has been received normally and moves to the next step, and when a negative response NACK is received, T
The RM1 50 recognizes that it has not received the data normally and retransmits the data DATAO or outputs a status message depending on the content. In the same way, the required data is transmitted and received sequentially, and finally the CPU
IQ sends data transfer completion signal EOT and TRM, 50
After receiving a positive response ACK or negative response NACK, the data transfer is completed by performing predetermined processing. Other TRs,
Control of M is similarly performed individually via each R8232C interface.

However, in this data transfer method, n R8232C ink faces, the same number as the number of controlled TRMs, are connected to the CPU
FD 1:n group control is required on a personal computer, etc. that does not have a sufficient number of such interfaces (for example, has only one human output board) and does not have a time-sharing data transfer function. However, if you tried to do it forcibly, you would have to use a high-end computer such as a minicomputer, which has a large number of users, and it would be expensive. In addition, the selection and activation of TRMs and the procedures for data transfer must be performed in separate processes, which increases the number of software steps.Furthermore, each TRM must be equipped with a function to determine whether data is correct or incorrect, making it complex and expensive. There was a drawback.

An object of the present invention is to connect n TRMs in parallel to the CPU via one dedicated interface, and to transmit all TRMs from the CPU.
The above disadvantages are eliminated by simultaneously transmitting the same information to the selected T-M, collating the returned information only from the selected T-M, and performing predetermined processing. n
The object of the present invention is to provide a group control data transfer system that allows group control in one format.

According to the present invention, a central processing unit having at least one human output port and having no time-sharing data transfer function;
The central processing unit includes one dedicated interface, which is one human output port of the central processing unit, and n terminal devices (n is a positive integer) connected in parallel via the dedicated ink interface. The device simultaneously transmits information including an identification code for identifying the terminal device to be selected to the n terminal devices, and then compares the information returned from the selected terminal device with the transmitted information, and when the comparison does not match, transmits the transmitted information. A 1:n group control data transfer system is obtained, which is characterized in that the data is retransmitted.

Next, the present invention will be explained with reference to FIG.

FIG. 2(a) is a block diagram showing an embodiment of the group control data transfer method of the present invention, and FIG. 2(b) is a block diagram showing an embodiment of the group control data transfer method of the present invention.
12 is a time chart showing an example of the sequence of transfer information between the central processing unit and n terminal devices in FIG. In the same figure, one R8232C interface 7-70nn (DM /
D30. ~3 n , transmission line and M/D 40.
~4n through n+7) T'FI M.

50, to TRMn5n are connected in parallel. Furthermore, limb M/D
3Q, ~3n, 40. ~4n and the transmission line may be a photoelectric converter 0/E and an optical transmission line.

Command data CMD sent first from C'PU60
To DAT', part of the selected TRM (for example, TRM, 5
An identification code that can only be identified by 0) is added in advance. 5 pty 607)s total TxcM, 5o.

~ When the command/code data CMDDATA is sent to TRMn5n at the same time, only TRMl 50 recognizes that its own device has been selected and sends the received command data CMDD.
AffAwo-toii M/D 40, transmission line, M/D30, R, 5232C interface 7
0 to the CPU 60. The CPU 60 sends the returned command data CMDDAT:8 to the previously sent command data 5n, and if they do not match, retransmits the command f-DMDDATA. TRM,
When 50 receives the data DATAO, it directly changes to CP.
It is sent back to U60, and the CPU 60 performs the same verification. Thereafter, data transfer is performed sequentially in the same manner. Here, this one block of data DATAm is the start option text ST
X + code + data + end of text When DATAm is received, it can be identified whether the block is the first time or a retransmission. In other words, a series of data v=codes received on the selected TRM side have logical values "0" and "1".
If they appear alternately, it is recognized that the data for each block has been received normally, and if the logical value "0" or "1" appears consecutively, it is recognized as retransmitted data, and the previous block of received data is When the transfer of all data is completed in this way, the CPU 60 finally transmits the data transfer completion signal EOT, and the TR, M, and 50 return the data transfer completion signal BOT as is.CCPU 60
Similarly, the TRM recognizes the completion of data reception at 50 and completes a series of data transfer procedures to the selected TRM.

In this embodiment, the CPU 60 has one human output port, but the present invention may be applied to a CPU having a plurality of human output ports by using only one of them. Further, although the R8232C interface is used as a dedicated interface, it goes without saying that an interface dedicated to the photoelectric converter Q/E may be used in an optical communication system.

As is clear from the above description, according to the group control data transfer method of the present invention, one central processing unit.

-N terminal devices can be group-controlled in a one-to-n format using the human output port for data transfer, so even devices with inexpensive central processing units such as The effect is that it can be realized.

[Brief explanation of the drawing]

FIG. 1(a) is a block diagram showing an example of a conventional data transfer method, and FIG. 1(b) shows an example of the sequence of information transferred between the central processing unit and one terminal device in FIG. 1(a). The time chart, FIG. 2(a) is a block diagram showing an embodiment of the group control data transfer method of the present invention, and FIG.
b) is a time chart showing an example of the sequence of information transferred between the central processing unit and n terminal devices in FIG. 2(a). In the figure, 10.60...Central processing unit (C
PIJ), 20, ~2 n, 70--・R, S 232
C interface, 30. ~3n, 40. ~4n
------・Modem (M/D), 50, ~5n・
...Terminal device (TRM, . . . ~TRMn).

Claims (1)

[Claims] A central processing unit having at least one human output port and having no time-sharing data transfer function, one dedicated interface that is one human output port of the central processing unit, and parallel processing via the dedicated interface port. (a) The central processing unit transmits information including an identification code for identifying the selected terminal devices to the n terminal devices simultaneously. A one-to-n group control data transfer characterized in that after sending, the return (/?) information from the selected terminal device a is checked against the sending information, and when the matching does not match, the sending information is re-sent. method.