JPH04112537U - data transfer device - Google Patents

Abstract

(57) [Summary] [Purpose] When transferring recorded data from a host computer to a recording device, the purpose is to automatically set the same conditions as the data transfer conditions of the host computer on the recording device side. [Structure] Framing errors and parity checks are performed for each byte of transferred data, and if an error occurs, the set transfer conditions are sequentially changed, and errors occur continuously for a predetermined number of data. When no more occurrences occur, it is assumed that the transfer conditions set at that time are the correct transfer conditions.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention provides a method for recording data when transferring recorded data from a host computer to a recording device. This relates to a data transfer device provided on the device side.

0002

[Conventional technology]

Data transfer conditions include baud rate and mode, and baud rate is 96. Six different baud rates are used, ranging from 00 bits/second to 300 bits/second. There are two types of character length: 7 bits and 8 bits. and parity is even parity, odd parity, or There are three types of transfer modes: bitless and non-bit, and a total of six types of transfer modes. As for other data transfer conditions, is the number of stop bits 1 bit? There is a distinction whether it is 2 bits or not. These data transfer conditions are related to the host computer sending the data and the data transfer conditions. If the recording device receiving the data is not set to match each other, the data will not be accurate. data transmission is not performed. However, the number of stop bits is determined by the transmitter and receiver. Even if the settings are different, data transmission will not be affected.

0003 What data transfer conditions are set on the host computer connected to the recording device? Even if the data is sent from the host computer on the recording device side, Configure the same data transfer conditions as those set on the host computer. Although it is desirable to be able to configure automatically, conventional devices do not have such automatic configuration devices. does not exist.

0004 Conventionally, when connecting a host computer to a recording device, the host computer Check the data transfer conditions set on the (dip switch) etc. to manually set the same transmission conditions. Many methods are used, and traditional methods that automatically set data transfer conditions Now, we will transmit a specific character from the host computer to the recording device, and then The recording device side determines the data transfer mode based on the bit pattern of the character. was.

[0005]

[Problem that the idea aims to solve]

The problem we are trying to solve is that with conventional data transfer devices, the data cannot be transferred manually on the recording device side. It is necessary to set the sending conditions, which becomes cumbersome for the operator, and automatic setting is not possible. It is up to the host computer to transmit specific characters in a specific sequence for The problem is that the device must be installed on the computer side. This invention was devised to solve this problem, and the host computer side Leave as is and use the recording data sent from the host computer. To provide a data transfer device that can automatically set data transfer conditions by It is an object.

[0006]

[Means to solve the problem]

The data transfer device according to the present invention uses data transfer conditions temporarily set on the recording device side. Framing errors and parity are detected for each byte of data received according to the Check if there are any errors in the data transfer condition, and if there are any errors, adjust the data transfer condition settings accordingly. Next, change the setting value until the set value is correct when a predetermined number of consecutive error-free data occur. The most important feature is that it is a set value.

[0007]

【Example】

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 is a host computer. 2 is a plotter (recording device), 3 is a keyboard attached to plotter 2, 1 1 is the interface on the host computer 1 side, 21 is the interface on the plotter 2 side Ace. Further, the plotter 2 is program-controlled by the CPU 23, and is a buffer memory, 24 is a ROM that stores general program memory, and 25 is a buffer memory. ROM stores automatic setting routines, 26 is RAM for general use, and 27 is for transfer conditions. 28 is a non-volatile memory that stores transfer conditions; 29 is a memory that stores transfer conditions temporarily; This is a recording control circuit. Automatic setting rule when entering a specific command from keyboard 3 startup is started.

[0008] 2 and 3 are flowcharts showing the program steps of the automatic setting routine 25. 2 and 3 are connected at T1 and T2 shown in the figure, respectively. , 100 to 120 in each figure indicate each step, respectively. The interface 21 receives data transmitted in bit serial format. It is equipped with a register, and the CPU 23 reads the data in the register one byte at a time. Take it out and inspect it. In step 100 of Figure 2, initial values of baud rate, mode, and stop bit length are set. Set. In this case, the stop bit length is set to 2, which needs to be changed afterwards. There is no.

[0009] Step 102 checks for framing errors. Figure 4 shows a 1-byte transmission signal The bit pattern is shown, and the 10th bit from the falling point of the start bit is discussed. This is the stop bit of "H", and if this is not "H", it is set in the recording device. It is determined that there is an error in the baud rate or mode, and this is corrected. At this time, this one bar If the data is the first data in the register of interface 21, the default is Proceeding to step 104, 8-bit non-parity is set. If there is no framing error, check for parity errors in step 106. If there is a parity error, it is determined that the parity method set as the mode is incorrect. If it is the default, the process moves to step 104.

0010 There is a framing error or parity error and that byte is not the first data. If so, proceed to step 108 and change the mode or baud rate. Bolle on the sending side How the start is set depends on other information, such as the start bit during a given time. It can also be determined based on information such as how many are included. In the execution of step 108, whether there was a framing error or a parity error. What was the history of the previously set modes? Next, determine the mode and baud rate to be set. When the baud rate is changed in step 108, whether the byte in question is an interface The next byte to be inspected becomes the default. When step 104 is executed, clear the default in step 109 and inspect Set the number of passing bytes N to N = 0, and return to step 101 to start inspecting the next byte. start

[0011] In this way, bytes are inspected one after another while changing the mode and baud rate. When I do this, I get bytes with no framing errors or parity errors. At this time Step 112 in FIG. 3 is entered from T1 in FIG. 2, and the mode set at that time is 8. If it is not bit non-parity, it means that the setting is correct, and step 11 3, N=N+1, N is 100, and 100 bytes were correctly received. It is determined that the transfer conditions temporarily stored in the transfer condition RAM 27 are stored in the non-volatile memory. 28, and thereafter the transfer is controlled according to the transfer conditions set in the non-volatile memory 28. control. In this case, the data saved in the buffer memory 22 in step 110 is is also received again according to this transfer condition.

0012 Furthermore, if the determination in step 112 is YES, the host computer side The code can be 7-bit non-parity, 8-bit non-parity, or 7-bit even parity. There are four types: parity or 7-bit odd parity. 8 bits of the data One of the above is determined from the pattern, and the mode setting is changed based on the determination result. this The mode of the change result is determined in step 119 and the process proceeds to step 113, or The process returns to step 101 via step 120.

[0013] As described above, according to the present invention, the automatic setting routine 25 is started and FIG. By performing the control shown in 3, the data transfer conditions similar to those of the host computer can be achieved. Data transfer conditions can be automatically set in the recording device.

[0014]

[Effect of the idea] As explained above, in the data transfer device of the present invention, the recording device side Data transfer conditions can be set automatically, so you can connect the recording device to the host computer. This has the advantage of simplifying the operations when using the system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart showing some of the program steps of the present invention.

FIG. 3 is a flowchart showing some of the remaining program steps of the present invention.

FIG. 4 is a diagram showing a bit pattern of 1 byte of transfer data.

[Explanation of symbols]

1 host computer 2 Plotter 21 Plotter side interface 22 Buffer memory 25 Automatic setting routine 28 Non-volatile memory

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Motoharu Murakami Graffte, 3-19-6 Nishi-Shinagawa, Shinagawa-ku, Tokyo Inside Tsuku Co., Ltd.

Claims (1)

[Scope of utility model registration request] [Claim 1] In a data transfer device for importing data transferred from the outside into the recording device as recorded data of the recording device, the recording device has a method for automatically setting a mode and a baud rate that are conditions for transferring the data. It has an automatic setting routine that performs program control, and when this automatic setting routine is started, an initial setting means that sets predetermined data for the above mode and baud rate as transfer condition data, and sets the data to be transferred one byte at a time. A framing check is performed to check whether the data after a predetermined number of bits from the start bit has the logic defined as the stop bit, and the data set as the transfer condition data is checked for the input one byte of data. means for performing a parity check based on the parity of the data being inspected; means for setting the mode of the transfer condition data to 8-bit non-parity when a framing error or parity error is detected in the initially inspected data; means for changing the mode or baud rate by referring to the past change history of the transfer condition data when a framing error or parity error is detected in the data inspected thereafter;
If neither a framing error nor a parity error is detected in the inspected data, and the mode set as the transfer condition data at that point is a mode other than 8-bit non-parity, it is determined that the setting of the transfer condition data is correct. and a means for setting transfer condition data that is successively determined to be correct for a predetermined number of data as correct data, and when neither a framing error nor a parity error is detected in the inspected data, setting it as the above transfer condition data at that point. If the current mode is 8-bit non-parity, check the data to determine whether it is 8-bit non-parity, 7-bit non-parity, 7-bit even parity, or 7-bit odd parity. 1. A data transfer device comprising means for determining the transfer condition data, changing the transfer condition data according to the determination, and then proceeding to check the next data.