KR100622828B1 - Communication Method of Serial Communication System - Google Patents

Abstract

According to an aspect of the present invention, there is provided a communication method of a serial communication system for transmitting and receiving data between a master device and a slave device, the method comprising: a start field part of a header indicating a start point of a communication string between packets transmitted and received between the master device and the slave device; A string length field unit for indicating a length of a communication string; A command field portion representing an instruction of an actual indexer operation; A checksum field unit for confirming whether communication between the master device and the slave device is normally performed; And an end field part of the header indicating the end point of the communication string.

RS-232C, Packet, Master Device, Slave Device

Description

Communication method of serial communication system {Communication Method of Serial Communication System}             

1 is a block diagram of a general serial communication system.

2 is a diagram illustrating a format of a packet transmitted between a master device and a slave device according to the present invention.

3 to 10b are diagrams illustrating packets transmitted between a master device and a slave device according to an embodiment of the present invention.

The present invention relates to a communication method of a serial communication system. More particularly, the present invention relates to a communication method of a serial communication system, which makes the status and control of a master device and a slave device easier and more concise.

The serial communication method is a method of serially transmitting and receiving data through a single data line by replacing data consisting of a plurality of bits with a bit string in data communication. This serial communication method is directly connected to the transmission equipment is applied to the data communication to know the status of the equipment.

Hereinafter, a general serial communication system will be described in detail with reference to FIG. 1.

As shown in FIG. 1, in a general asynchronous serial communication system, a master device 10 and a slave device 20 are connected to a communication line, and the master device 10 is a central computing device ( A memory module 11 connected to the CPU 12 and its central computing device 12, a user interface 13, a buffer 14, and a communication module 15 for transmitting and receiving data with the slave device 20; The slave device 20 includes a central computing unit (CPU) 22, a memory 21 connected to the central computing unit 22, a system load driving unit 23, a buffer 24, and a master device 10 and data. It is provided with a communication module 25 for transmitting and receiving. In this case, the communication modules 15 and 25 are configured to support a contracted communication protocol (for example, RS-232C).

When the devices 10 and 20 transmit and receive data according to a contracted communication protocol, the devices 10 and 20 master the authority of flow control on the transmitted data in order to avoid collision of the transmitted data and to transmit and receive data stably between the devices. Owned by the device 10.

However, conventionally, in using the serial communication method as described above, each company has various modifications and has its own communication protocol (Protocol). As a result, in performing serial communication, there is a situation in which the types and commands of packets transmitted between devices are not organized, and confusion is caused for each company.

The present invention has been made to solve the above problems, the object of which is to provide a format of one packet to facilitate data transmission between companies handling various types of equipment, the master device and the slave It is to make the state and control of the device easier and more concise.

In the communication method of the serial communication system for transmitting and receiving data between the master device and the slave device,

A start field part of a header indicating a start point of a communication string of a packet transmitted and received between the master device and a slave device; A string length field unit for indicating a length of a communication string; A command field portion representing an instruction of an actual indexer operation; A checksum field unit for confirming whether communication between the master device and the slave device is normally performed; And an end field part of the header indicating the end point of the communication string.

Preferably, the communication string length is a length of a command and a checksum.

The method for calculating the checksum includes (a) converting the contents of the header field, the string length field, and the command field of the header into an ASCII code and summing the values, and (b) adding the values added in step a. In the case of three or more digits, the method comprises the steps of leaving only two lower digits and (c) dividing the two remaining digits in step b into upper and lower positions into a communication string.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating a format of a packet transmitted between a master device and a slave device according to the present invention.

Referring to FIG. 2, the format of a packet transmitted between a master device and a slave device in a serial communication system according to the present invention includes a Start of Header (SOH) field part and a String Length (LEN) field part. And a command field portion, a checksum (CHK: CHecKsum) field portion, and a header end field portion (EXT: EXTend).

In the present invention, a general serial communication method is used. That is, in one embodiment of the present invention, the communication speed is 9600bps, the start bit has a value of '0', the data bit is 8 bits, there is no parity bit, and the stop bit is 1 bit. .

First, in this specification, the start (SOH) field portion of the header will be described.

The start (SOH) field of the header informs the start of the communication string.

The header (SOH) field part of the header may be, for example, represented as '01H' in ASCII code. Of course, the ASCII code value can be set differently for each user.

The string length (LEN) field part informs the length of the communication string.

The communication string length may be represented by a length of a command and a checksum CHK. Accordingly, the receiving side (eg, slave device) can determine whether the packet transmitted from the transmitting side (eg, master device) is correctly transmitted by looking at the string length field part.

For example, when the command is 'SX', the checksum high bit (CHKH) is '3', and the checksum low bit (CHKL) is 'F', the length of the communication string is four. do.

Although briefly described above, the checksum (CHK) field unit may be divided into a checksum upper bit unit (CHKH: CHecKsum High) and a checksum lower bit unit (CHKL: CHecKsum Low).

The checksum upper bit part CHKH refers to an upper bit of two bits of a checksum of a communication string, and the checksum lower bit part CHKL refers to a lower bit among two bits of a checksum of a communication string.

The checksum is obtained by the following steps.

(a) The contents of the header start (SOH) field part, the character string length (LEN) field part, and the command (COMMAND) field part are converted into ASCII codes and the values are summed.

Here, the ASCII code is preferably hexadecimal.

(b) If the value added in step b is three or more digits, only the lower two digits are left.

(c) The remaining two digits in step b are divided into upper and lower parts and put into a communication string. That is, the value divided by the upper part is inserted into the checksum upper bit part CHKH, and the value divided into the lower part is inserted into the checksum lower bit part CHKL.

For example, the content (value) of the header (SOH) field part is' 01H ', the content (value) of the string length (LEN) field part is' 03H', and the content (value) of the command (COMMAND) field part is' Assuming S ', the value summed up by step a is 57 (hexadecimal). Accordingly, the checksum high bit CHKH becomes '5' and the checksum low bit CHKL becomes '7' by the steps b and c.

The packet transmitted according to the embodiment is as shown in FIG.

The end field section EXT of the header informs the end point of the communication string.

The end field section EXT of the header may be, for example, represented as '126H' in an ASCII code. Of course, the ASCII code value may be set differently for each user as in the start (SOH) field of the header.

The Command field portion is a field representing a command of an actual indexer operation.

In the following description, the command will be described in more detail with an example.

Protocol specification according to an embodiment of the present invention is basically based on four ports.

Table 1 shows the types of commands (commands) according to an embodiment of the present invention.

<Table 1> Command Type

In addition, the format of the packet of the response and report (Reply, Indexer → M / C) according to an embodiment of the present invention is shown in FIG.

 That is, when a packet is transmitted from the master device M / C to a slave device (indexer) (see FIG. 2), a response and report packet is transmitted from the slave device to the master device (see FIG. 4).

As shown in FIG. 4, the format of a packet of a response and a report from a slave device to a master device according to an embodiment of the present invention includes a start of header (SOH) field part and a string length (LEN). Length field portion, a reply field portion, a checksum (CHK: CHecKsum) field portion, and a header end field portion (EXT: EXTend).

Table 2 below shows the contents of the reply field unit.

<Table 2> Contents of response field part

Next, the command will be described in more detail.

(1) Command 'B' is a command to tell the result value of Bar Code Reader.

The command 'B' must be sent to the indexer before the corresponding lot start, and the bar code result value is displayed on the display unit (monitor, etc.) in the indexer device (slave device). .

The format (M / C? Indexer) of the packet including the command 'B' is as shown in FIG.

Referring to FIG. 5A, a packet including a command 'B' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (B) field part, and a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

An ID field part and a DATA field part are further included between the command B field part and the checksum upper bit part CHKH.

The ID field part refers to a port, and the DATA field part means a result value of a bar code.

In the present invention, the number of digits in the DATA field portion is preferably unlimited.

FIG. 5B is a format of a response packet to FIG. 5A.

Referring to FIG. 5B, a response packet for a packet transmission from a master device M / C including a command 'B' to a slave device (Indexer) includes a start (SOH) field part of a header and a string length ( LEN) field portion, reply field portion, checksum (CHKH, CHKL) field portion, and header end field portion (EXT).

In FIG. 5 (b), 'A' in the reply field part means 'normally transmitted' (see Table 2).

(2) Command 'C' is a command to clamp ON and adsorption ON.

The format (M / C? Indexer) of the packet including the command 'C' is as shown in FIG.

Referring to FIG. 6A, a packet including a command 'C' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (C) field part, and a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

An N1 field part is further included between the command C field part and the checksum upper bit part CHKH.

The N1 field part refers to a port number or adsorption arm setting, as shown in Table 3.

<Table 3> Contents of N1 field part

FIG. 6B is a format of a response packet to FIG. 6A.

Since the response packet shown in FIG. 6 (b) is the same as the format shown in FIG. 5 (b), a detailed description thereof will not be provided herein.

(3) Command 'D' is a command to specify the port state in the indexer.

The format (M / C? Indexer) of the packet including the command 'D' is as shown in FIG.

Referring to FIG. 7A, a packet including a command 'D' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (D) field part, and a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

N P field parts P1 to Pn are further included between the command D field part and the checksum upper bit part CHKH.

The P1 to Pn field parts indicate operation states for the corresponding ports, and the contents thereof are shown in more detail in Table 4 below.

<Table 4> Contents of 1 to Pn field part

'Empty' corresponding to the port number 0 indicates that 'no cassette has been loaded' (Load REQ).

'Idle' corresponding to the port number 1 indicates that the cassette is loaded but the clamp is in the OFF state.

'Waiting' corresponding to the port number 2 means that the cassette clamp is turned on, the CCR is read, the BCR is read, and the mapping is terminated.

The term 'reserved' corresponding to the port number 3 indicates that a process start command has been received and the body waits for glass to be injected into the main body.

'Busy' corresponding to the port number 4 indicates that the glass is being transferred.

'Completed' corresponding to the port number 5 indicates that all of the glass in the cassette has been loaded. (Unload REQ)

'Cancelled' corresponding to the port number 6 indicates that the cassette's process was canceled before the process started.

The term 'Aborted' corresponding to the port number 7 means that the 'Abort' switch is pressed or the process is canceled by the host command while the process is being processed.

The term 'Paused' corresponding to the port number 8 refers to a state in which a transfer of glass is paused by a host pause command.

'Unknown' corresponding to the port number 9 indicates that the state is unknown.

FIG. 7B shows the format of the response packet of FIG. 7A.

Since the response packet shown in FIG. 7 (b) is the same as the format shown in FIG. 5 (b), a detailed description thereof will not be provided herein.

(4) The command 'E' is a command for deleting all the states in the indexer and resetting it to the state when the first indexer was started.

The format (M / C? Indexer) of the packet including the command 'E' is as shown in FIG.

Referring to FIG. 8A, a packet including a command 'E' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (E) field part, and a checksum (CHKH, CHKL). ) Field part and header end field part (EXT).

An R field part, an A field part, an S field part, and an E field part are further included between the command E field part and the checksum upper bit part CHKH.

Here, the 'E field part, the R field part, the A field part, the S field part, and the E field part' indicates to perform 'ERASE'.

FIG. 8B is a format of a response packet to FIG. 8A.

Since the response packet shown in FIG. 8 (b) has the same format as shown in FIG. 5 (b), a detailed description thereof will not be provided herein.

(5) The command 'H' is a command to move to the previously set home position (Home Position: Standby position). It is generated in the loader.

The format (M / C? Indexer) of the packet including the command 'H' is as shown in FIG. 9 (a).

Referring to FIG. 9A, a packet including a command 'H' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (H) field part, and a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

Three field parts N1 to N3 are further included between the command H field part and the checksum upper bit part CHKH.

The field portion N1 represents a home position (home position), as shown in Table 5.

<Table 5> Contents of N1 field part

In the present invention, it is preferable to move to the position where the next glass can be easily taken in order to reduce the tack time even a little when moving to the home position.

The field portions N2 and N3 indicate the positions 00 to 20 of the slots.

FIG. 9B is a format of a response packet to FIG. 9A.

Since the response packet shown in FIG. 9 (b) has the same format as shown in FIG. 5 (b), a detailed description thereof will not be provided herein.

(6) The command 'I' initializes the status of the entire indexer equipment, but the initialization contents must return to the current indexer status.

For example, if there is a cassette above port 1, but it is temporarily initialized with no cassette, but after initialization, it should be marked as having a cassette.

The format (M / C? Indexer) of the packet including the command 'I' is as shown in FIG.

Referring to FIG. 10A, a packet including a command 'I' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (I) field part, and a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

Three field parts (N, I, T) are further included between the command (I) field part and the checksum higher bit part (CHKH).

The three field parts N, I, and T are field parts added for easier recognition by the slave device. That is, the command (I) field part represents the English word 'INIT' together with the three field parts (N, I, T).

FIG. 10B shows the format of the response packet for FIG. 10A.

The response packet shown in FIG. 10 (b) is the same as the format shown in FIG. 5 (b), and thus a detailed description thereof will not be provided herein.

(7) Command 'K' is a command to display the online form between the master device (M / C) and the user (Customer: SEC or HD, ETC ...). That is, the command 'K' must be notified to the indexer equipment when the online form between the M / C and the customer is changed, and the changed command is to be displayed on the display unit (monitor, etc.) in the indexer equipment.

The format (M / C? Indexer) of the packet including the command 'K' is shown in FIG. 11 (a).

Referring to FIG. 11A, a packet including a command 'K' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (K) field part, and a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

An ID field part is further included between the command K field part and the checksum upper bit part CHKH.

The ID field part indicates an online status code, and details thereof are as shown in Table 6.

<Table 6> Contents of ID field part

FIG. 11B is the format of the response packet to FIG. 11A.

Since the response packet shown in FIG. 11 (b) is the same as the format shown in FIG. 5 (b), a detailed description thereof will not be provided herein.

(8) Command 'M' is a command to return glass.

The format (M / C? Indexer) of the packet including the command 'M' is as shown in FIG.

Referring to FIG. 12A, a packet including a command 'M' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (M) field part, and a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

Field portions M1, P1, S1, P2, and S2 are further included between the command M field portion and the checksum higher bit portion CHKH.

The said field part M1 shows the form which conveys glass, and the detail is as showing in Table 7.

<Table 7> Contents of M1 field part

The field parts P1 and P2 represent port numbers, and the details thereof are shown in Table 8.

<Table 8> Contents of field part P1, P2

The field parts S1 and S2 represent slot numbers, and the details thereof are shown in Table 9.

<Table 9> Contents of the field parts S1 and S2

FIG. 12B shows the format of the response packet for FIG. 12A.

Since the response packet shown in FIG. 12 (b) has the same format as shown in FIG. 5 (b), a detailed description thereof will not be provided herein.

(9) Command 'O' is a command to move the drive shaft in the indexer to the origin.

The command 'O' occurs when the 'Origin' button is pressed at the initial stage of the equipment or at the operation panel.

In the present invention, since the command 'INIT' does not occur separately, it is preferable that all states of the indexer equipment (device) are initialized when the command 'O' occurs.

The format (M / C → indexer) of the packet including the command 'O' is as shown in FIG. 13 (a).

Referring to FIG. 13A, a packet including a command 'O' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (O) field part, and a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

An N1 field part is further included between the command (O) field part and the checksum upper bit part CHKH.

In the present invention, the target to be moved to the origin can be selected by the N1 field portion.

Table 10 below shows the contents of the N1 field part.

<Table 10> Contents of N1 field part

FIG. 13 (b) shows the format of the response packet for FIG. 13 (a).

Since the response packet shown in FIG. 13 (b) has the same format as shown in FIG. 5 (b), a detailed description thereof will not be provided herein.

(10) Command 'P' is a command to approve the loading or unloading of a cassette.

The format (M / C? Indexer) of the packet including the command 'P' is as shown in FIG.

Referring to FIG. 14A, a packet including a command 'P' includes a start (SOH) field part of a header, a string length (LEN) field part, a command P field part, a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

Field portions ST and ID are further included between the command P field portion and the checksum higher bit portion CHKH.

The ST field part represents a port number, and details thereof are as shown in Table 11.

<Table 11> Contents of ST field part

The ID field part represents an authorization code, and details thereof are as shown in Table 12.

<Table 12> Contents of ID field part

FIG. 14B shows the format of the response packet shown in FIG. 14A.

Since the response packet shown in FIG. 14 (b) has the same format as shown in FIG. 5 (b), a detailed description thereof will not be provided herein.

(11) Command 'R' is a command to pause the indexer device when a hardness error occurs in the indexer device.

The command 'R' is also used to continue the operation before the pause in the pause state.

The format (M / C? Indexer) of the packet including the command 'R' is as shown in FIG. 15 (a).

Referring to FIG. 15A, a packet including a command 'R' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (R) field part, and a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

An N1 field part is further included between the command R field part and the checksum upper bit part CHKH.

The N1 field part specifies a retry type, and more details are shown in Table 13.

<Table 13> Contents of N1 field part

FIG. 15B is a format of a response packet to FIG. 15A.

Since the response packet shown in FIG. 15 (b) has the same format as shown in FIG. 5 (b), a detailed description thereof will not be provided herein.

(12) Command 'SS' is a command to check the status when an error occurs.

The format (M / C? Indexer) of the packet including the command 'SS' is as shown in FIG.

Referring to FIG. 16A, a packet including a command 'SS' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (S, S) field part, and a checksum (CHKH). , CHKL) field portion, and a header end field portion (EXT).

FIG. 16B shows the format of the response packet to FIG. 16A.

The response packet shown in FIG. 16 (b) includes a header start (SOH) field part, a string length (LEN) field part, a response (A) field part, a checksum (CHKH, CHKL) field part, And an end field section EXT.

Eight field fields E1 to E8 are further included between the response A field portion and the checksum higher bit portion CHKH.

The field portions E1 to E8 in the eighth rows are as shown in Fig. 16C.

Table 14 shows details of the E1 field part.

<Table 14> Contents of E1 field part

Table 15 below shows the contents of the E2 field part in detail.

<Table 15> Contents of E2 field part

Table 16 below shows the contents of the E3 field part in detail.

<Table 16> Contents of E3 field part

Table 17 below shows the contents of the E4 field part in detail.

<Table 17> Contents of E4 field part

Table 18 below shows the contents of the field parts E5 to E8 in detail.

<Table 18> Contents of the field part (E5 ~ E8)

(13) Command 'SZ' is a command to check the equipment status.

The format (M / C → indexer) of the packet including the command 'SZ' is as shown in FIG.

Referring to FIG. 17A, a packet including a command 'SZ' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (S, Z) field part, and a checksum (CHKH). , CHKL) field portion, and a header end field portion (EXT).

FIG. 17B shows the format of the response packet shown in FIG. 17A.

The response packet shown in FIG. 17 (b) includes a header start (SOH) field part, a string length (LEN) field part, a response (A) field part, a checksum (CHKH, CHKL) field part, and a header. And an end field section EXT.

A field section of 29 rows is further included between the response (A) field portion and the checksum higher bit portion (CHKH).

The field section of row 29 is as shown in Fig. 17C.

The contents of each field of the field section in line 29 are as follows.

First, the field parts C1 to C4 indicate the presence or absence of a cassette in the corresponding port, and the details thereof are shown in Table 19.

<Table 19> Contents of the field part (C1 to C4)

In the case of two ports in Table 19, all the remaining ports are preferably set to '1'.

The field parts C5 and C6 indicate the presence or absence of glass on the arm, and more details are shown in Table 20.

<Table 20> Contents of the field parts C5 and C6

In the case of the single arm in Table 20, it is preferable to set the value of C6 to '0'.

The N1 field part informs the operation state of the indexer (robot) equipment, and details are shown in Table 21.

<Table 21> Content of N1 field part

The N2 field part indicates the position of the robot when an error occurs, and Table 22 shows details.

<Table 22> Contents of N2 field part

The N3 field part displays the operation axis name currently operating in the indexer equipment, and details thereof are shown in Table 23.

<Table 23> Content of N3 field part

The N4 field portion represents an error code, and details are shown in Table 24.

<Table 24> Contents of N4 field part

The MD field portion displays the content finally received from the M / C device (master device).

The MD field part is basically 8 digits, but if the final received content is less than 8 digits, it is preferable to fill all remaining spaces with ASCII code '20H'.

For example, when the last received command is 'M1101A00', it is shown as shown in Fig. 17 (d).

In addition, when the last reception command is '01', it is shown as shown in Fig. 17 (e).

Here, the ASCII code value '20H' means blank.

The S1 field portion represents an AGV controller device state, and Table 25 shows more details.

<Table 25> Contents of S1 field part

The field units D1 to D4 set the cassette loading / unloading method of the corresponding port, and the details thereof are shown in Table 26.

<Table 26> Contents of field part (D1-D4)

In the case where two ports are used in Table 26, all the remaining ports are preferably set to 'D'.

① In one embodiment of the present invention, the protocol specification is basically based on four ports.

Accordingly, using the present specification, the 2 port indexer fills the corresponding bit of the unused port of the C1 ~ C4 with '1', and fills the corresponding bit of the unused port of the D1 ~ D4 with the 'D'. Of course, D1 to D4 are set by the 'Z' Command, but basically fill D1 to D4 by default at the start of the program. ③ And, finally, unused port among D9 ~ D12 is filled with '！'.

In one embodiment of the present invention, the field units D5 to D8 are not defined.

The field portions D9 to D12 represent the state of the cassette port (without using the P command), and can be divided into a case where the P command is invalid and a case where the P command is invalid.

Details of the case where the P command is invalid are shown in Table 27.

TABLE 27

More details of the case where the P command is valid are shown in Table 28.

TABLE 28

Table 29 shows details of the D13 field part.

TABLE 29

Table 30 below shows the details of the D14 field part.

TABLE 30

(14) Command 'U' is a command to clamp off and to turn off suction.

The format (M / C-> indexer) of the packet including the command 'U' is as shown in FIG. 18 (a).

Referring to FIG. 18A, a packet including a command 'U' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (U) field part, and a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

An N1 field part is further included between the command U field part and the checksum upper bit part CHKH.

The N1 field part represents a port number or an adsorption arm setting, as shown in Table 31.

<Table 31> Content of N1 field part

In Table 31 above, this command is ignored if glass is present on the arm at the time of arm adsorption off.

FIG. 18B is a format of a response packet to FIG. 18A.

Since the response packet shown in FIG. 18 (b) has the same format as shown in FIG. 5 (b), a detailed description thereof will not be provided herein.

(15) The command 'W' is the start command for rational search.

There are two types of packet format (M / C? Indexer) including the command 'W'.

First, as shown in Fig. 19A, a packet including a command 'W' includes a start (SOH) field part of a header, a string length (LEN) field part, and a command (W, S, N1) field. And a checksum (CHKH, CHKL) field portion, and a header end field portion (EXT).

The first case is used when it is not Auto mapping.

Second, as shown in Fig. 19B, the packet including the command 'W' includes a start (SOH) field part of a header, a string length (LEN) field part, and a command (W, D, N1) field. And a checksum (CHKH, CHKL) field portion, and a header end field portion (EXT).

The second case is used in the case of auto mapping.

Table 32 shows the contents of the N1 field part. Here, the N1 field portion represents a port number.

<Table 32> Contents of N1 field part

19 (c) is a format of a response packet to FIG. 19 (a).

Since the response packet shown in FIG. 19 (c) has the same format as shown in FIG. 5 (b), a detailed description thereof will not be provided herein.

FIG. 19D shows the format of the response packet shown in FIG. 19B.

The response packet shown in FIG. 19 (d) includes a header start (SOH) field part, a string length (LEN) field part, a response (A) field part, a checksum (CHKH, CHKL) field part, and a header. And an end field section EXT.

The field portions D1 to D20 of 20 rows are further included between the response A field portion and the checksum higher bit portion CHKH.

The field portions D1 to D20 of the 20th row are as shown in FIG. 19E, and the details are shown in Table 33.

<Table 33> Contents of field part (D1-D20)

(16) Command 'Z' is a command for selecting a device to load / unload a cassette.

The format (M / C? Indexer) of the packet including the command 'Z' is as shown in FIG. 20 (a).

Referring to FIG. 20A, a packet including a command 'Z' includes a start (SOH) field part of a header, a string length (LEN) field part, a command (Z) field part, and a checksum (CHKH, CHKL). ) Field portion and the end field portion EXT of the header.

Four field parts D1 to D4 are further included between the command Z field part and the checksum upper bit part CHKH.

The field parts D1 to D4 indicate selecting a device for loading / unloading a cassette, as shown in Table 34.

<Table 34> Contents of field part (D1-D4)

As described above, by providing a format of one packet between the master device and the slave device, data transmission is more easily performed between companies dealing with various types of equipment, and the status and control of the master device and the slave device are easier. It can be done concisely.

Claims (5)

In the communication method of the serial communication system for transmitting and receiving data between the master device and the slave device, A start field part of a header indicating a start point of a communication string of a packet transmitted and received between the master device and a slave device; A string length field unit for indicating a length of a communication string; A command field portion representing an instruction of an actual indexer operation; A checksum field unit for confirming whether communication between the master device and the slave device is normally performed; And an end field part of a header indicating an end point of a communication string, The checksum field portion is comprised of a checksum high bit portion CHKH and a checksum low bit portion CHKL, wherein the checksum high bit portion represents an upper bit of two checksum bits of a communication string, and the checksum low bit portion is a checksum two bits of a communication string. A communication method of a serial communication system, characterized by indicating a lower bit. The method of claim 1, wherein the communication string length is a length of a command and a checksum. The communication method of a serial communication system according to claim 1, wherein the character in the start field of the header uses '01H', and the character in the end field of the header uses 'H126'. delete The method of claim 1 wherein the method for calculating the checksum is (a) converting the contents of the header start field, the string length field, and the command field into an ASCII code and summing the values; (b) leaving only the lower two digits when the value added in step a is three or more digits; and (c) a communication method of a serial communication system, comprising the step of dividing the remaining two digits in the step b into upper and lower portions into a communication string.

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