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Summary of Contents for 2265

Page 1: ...M 2265 Display Station Model 1 and the IBM 2845 Display Control The two units combine to form a display system that provides visual access to I data stored in an IBM System 360 The IBM 2265 Display Station Model 2 which can be attached only to an IBM 2772 Multi Purpose Control Unit is described in System Components IBM 2770 Data Communications System Form GA27 3013 File No S360 09 Form GA27 2731 2...

Page 2: ... the communications medium telephone lines telegraph microwave etc used to transmit data via appropriate data sets between the 2701 and the 2265 1 2845 display system This is a major revision of and obsoletes Form A27 2731 1 and Technical Newsletter N27 2948 The significant changes in this edition include the following 1 The title has been changed to reflect that this publication describes the 226...

Page 3: ...Symbols 13 Error Recovery Procedures 45 Cursor General Description 13 NAK Response to Addressing Sequence 45 Nondestructive Cursor Symbol Standard 13 NAK Response to Text 45 Destructive Cursor Symbol Feature 16 EOT Response to Addressing Sequence 45 End of Message EOM Symbol 16 EOT Response to Text 45 Start of Message SOM Symbol 19 CAN Response 45 New Line NL Symbol 19 No Response to Addressing Se...

Page 4: ...ture Chart 50 5 Ten Bit Format of Transmitted USASCII 15 2845 Feature Chart 51 Characters 27 16 2265 United Kingdom Keyboard 52 6 Specific Poll to Display Station Sequence 17 2265 French Keyboard 52 Response Diagram 31 18 2265 German Keyboard 53 7 Specific Poll to Printer Sequence Response 19 Command Execution Timings 56 Diagram 32 Tables 1 Functions of 2265 Display Station Keys 8 I O Channel Read...

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Page 6: ...IBM 2265 Display Station Design Model IBM 2845 Display Control Design Model ...

Page 7: ...nter may be used to produce a paper copy of data sent from the central processor or of data displayed on the 2265 screen HIGHLIGHTS Character presentation uses an advanced stroke generation technique that results in characters of unusual clarity and smoothness 2265 CRT uses Type P39 phosphor to produce a green tinted display Introduction Each 2265 has a capacity of 960 characters with an optional ...

Page 8: ...com munication Access Method provides the programmer with simple efficient access to the communication environ ment so that he can program the terminal in a manner 8 consistent with that used for conventional sequential type I O devices BTAM controls data transmission however it does not provide for elaborate message queuing capability or for actual processing of the message itself The second acce...

Page 9: ...marized with feature numbers in Figures 14 and 15 of Appendix A Special Features The following special features may be selected at the option of the customer The number in parentheses following the feature name is the feature number Alphameric Keyboard Feature 4766 This feature permits the operator to key in data at the Display Station for display and or transmission to the central computer When a...

Page 10: ...845 may be attached to the same communications channel in a multidrop multistation configuration 10 DATA SETS One of the data sets described in the following paragraphs is required to interface the 2845 Display Control with the communications channel U S Domestic Operation In U S Domestic operation the 2845 Display Control operates at 1200 or 2400 bps point to point and multi point For 1200 bps op...

Page 11: ...sages may also be sent from the central processor to the 2845 and displayed on the Display Station screen Characters of the message text are displayed on the screen beginning at the character position currently occupied by the cursor If the Display Control is equipped with the Line Addressing feature the program may designate that the first character be displayed in the first character position of...

Page 12: ...ter message of greater length may be sent to the Display Station with the operator instructed as part of the message to execute a keyboard Print operation Or th 12 message may be sent in individual Write Printer trans missions of 240 characters or less directly to the Printer During transmission from the central processor to the Printer data displayed on the display screen is not affected The 1053...

Page 13: ... symbols described in the following paragraphs can be displayed on the screen of the 2265 Cursor General Description The cursor is an automatically inserted visual display position marker it denotes the display position on the 2265 screen that the next character entered will occupy Two types of cursor symbols nondestructive and destruc tive are available to permit selection of the cursor best suit...

Page 14: ...ration is ended If Write DS Line Address command is honored be fore a poll command EOM symbol mayor may not be over written depending on line addressed and length of text When command is concluded key board is unlocked and ENTER PENDING light is extinguished If Read Addressed Full DS Buffer command is honored before a poll command no change occurs on screen I When command is concluded keyboard rem...

Page 15: ... is in same char acter location as SOM when key is depressed cursor is advanced one character position No further change occurs In the preceding cases cursor position identifies first character that will be transmitted by 2845 upon depression of ENTER key 4 If an SOM symbol is already being displayed and if cursor is to right of and on same line as an NL symbol when key is depressed all display da...

Page 16: ...occupied by the cursor when the keyboard ENTER key is depressed as in manual input operations or when the PRINT key is depressed To ensure correct manual input operations when the nondestructive cursor is used the EOM symbol should be deleted from the 2265 screen between message transfers This can be accomplished through programming by issuing an Erase Write following a Poll command or by the oper...

Page 17: ...nlocked and ENTER PENDING light is extinguished If Read Addressed Full DS Buffer command is honored before a poll command no change occurs on screen When command is concluded keyboard remains locked ENTER PENDING light is on indicating Enter operation still pending Causes all data from first character position in first line to and including cursor to be printed by 1053 Printer Exceptions re NL sym...

Page 18: ...tion following existing SOM symbol 3 If an SOM symbol is already being displayed and if cursor is to right of and on same line as an NL symbol when key is depressed all display data is erased starting with position immedi ately following SOM symbol Erase continues observing NL symbols as in 2 until SOM is erased Cursor ulti mately occupies same position as when key was depressed In all cases curso...

Page 19: ... the of data that is to be transferred from a display buffer to the I O channel during a Specific Poll or General Poll operation If data is to be transferred during one of these operations the SOM symbol must be displayed on the 2265 screen before the data to be transferred Upon successful completion of either operation the SOM symbol is automatically deleted from the 2265 screen Deletion of this ...

Page 20: ...the operator may correct the error by inserting the proper character and again depressing the ENTER key CONTROL KEY FUNCTIONS The actions thatoccur when certain control keys are depressed are described in Tables 1 and 2 for both the nondestructive and destructive cursor The display symbols associated with control key functions where applicable are as follows 1 SaM symbol 2 NL symbol 20 3 Nondestru...

Page 21: ...e two characters may be in error 8 lines apart if 15 x 64 format 6 lines apart if 12 x 80 format Check symbols 1 m 4NAME ADDRESS 4DATE QUANTITY 10 24 36 Figure 3 Example Display Showing SOM NL Check Symbols and Nondestructive Cursor 15 x 64 Display Format Introduction 21 ...

Page 22: ...Receipt of a poll command causes a transfer to the I O channel of all data between the SaM and the cursor except the data displayed between the NL symbol and the end of the display line containing the symbol In the display 22 shown iIi Figure 3 all the data except the fIXed informa tion name address date part no and quantity would be transferred to the I O channel The NL symbols would be included ...

Page 23: ...lay system without affecting other units attached to the com munications channel This test may be performed if a communications problem is experienced with the central processor The test sometimes referred to as a wrap test may be helpful in localizing the problem to I the 2845 2 the host system including the I O channel 2701 and associated data set or 3 the communications facilities Depressing th...

Page 24: ...wrap test indicates that the 2845 and 2265 are working satisfactorily call the host system location to find out if the host system is operating properly and if the 2845 is being polled If the response to both queries is yes make a check of the communications equipment 24 ...

Page 25: ...transmitted over the communications channel common carrier facility The bits are transmitted serially the start bit being first The start and stop bits perform control Principles of Operation functions the VRC vertical redundancy check bit estab lishes even parity and is used for error checking only See Parity Checking These three bits are not part of the USASCII character BLOCK DIAGRAM ANALYSIS A...

Page 26: ... Displayed on 2265 s as the New Line symbol Causes a carriage return and line feed on the 1053 Model 4 Printer but no character is printed 4 Displayed on 2265 s as the SOM symbol Also prints on 1053 Model 4 as 5 The codes represented by the characters within the dotted outline are the USASCII 8 codes for the lower case alphabetic characters These codes are converted to upper case by the 2845 and d...

Page 27: ...ation control character used to indicate the conclusion of a transmission which may have contained one or more texts and any asso ciated heading addressing sequence EOT may also be used instead of SOH as the first byte in the addressing sequence LF Line Feed A format effector which should be included only as part of text When included in text ad dressed to a 2265 Display Station the LF character c...

Page 28: ...265 2845 display system is designed to operate on communications networks wherein the central computer 28 operates as the control station In this centralized system the computer initiates all contacts with the Display Control units attached to the network The computer may poll a number of Display Controls terminals and their attached components Display Station and Printer in turn until one is foun...

Page 29: ...el and the 2845 Display Control of a single USASCII communication control character or a sequence of characters of which one or more is a USASCII communication control character These exchanges are called sequences and responses The sequences and responses that occur during an opera tion depend upon the command conditions at the display system and the program The sequence and response dia grams Fi...

Page 30: ...correctly The ACK response causes the SOM symbol to be erased from the 12265 screen the keyboard ENTER PENDING light to be 30 extinguished and the keyboard to be restored The 2845 responds to ACK with EOT to conclude the operation Another I O channel response to receipt of the Display Station message must be considered As indicated in Figure 6 the I O channel may have a message to send to the poll...

Page 31: ...mpletely transmitted No Response No Response SOH or EaT response from the I O channel to a message ending in ETX LRC does not restore the 2265 keyboard clear the SaM symbol nor extinguish the ENTER indicator The Enter operation is still pending tSee Error Recovery Procedures for further I O channel responses tUseful in conversation mode to restore 2265 keyboard Figure 6 Specific Poll to Display St...

Page 32: ...SOH Sets Printer Request Indicates printer buffer overrun EOT NAK I I I I I I I I I I 14 I I I I No Response No Response t See Error Recovery Procedures for further I O channel responses Figure 7 Specific Poll to Printer Sequence Response Diagram 32 I NAK Printer 2845 Sequences and Responses I I EOT STX Printer Printer Address Not Ready Busy ETX LRC ACK I NAKt EOT t ...

Page 33: ...ommand The EOT response to a General Poll addressing sequence indicates that the 2265 has no message to send When the 2845 is equipped with the Printer Adapter Feature the EOT also indicates that either Printer Request was not set or that the Printer is still busy or not ready No response to the addressing sequence indicates that the 2845 did not successfully decode the addressing se quence or det...

Page 34: ...errun CAN is transmitted only if the 2845 detects an internal parity error after the ENTER key is depressed but before the message text is completely transmitted tSOH or EOT response from I O channel to a message ending in ETX LRC does not restore the 2265 keyboard c lear the SOM symbol nor extinguish the ENTER indicator The ENTER operation is still pending tsee Error Recovery Procedures for furth...

Page 35: ...he Destructive Cursor Feature see programming note under Read Full DS Buffer in text No Response No Response CAN is transmitted if the 2845 detects on internal parity error and no operator intervention has o curred depression of RESET key prior to recognition of command t See Error Recovery Procedures for further I O channel responses Figure 9 Read Addressed Full DS Buffer Sequence Response Diagra...

Page 36: ...ASE EOL ERASE EOS ERASE DPLY TEST and RESET keys do not lock the keyboard neither do they perform their normal functions 36 PROGRAMMING NOTE Ifthe ENTER key was depressed before the Write Addressed DS command is transmitted upon decoding of the command the ENTER indicator is extinguished the key board is restored and the Write operation continues Upon receiving the ACK response the normal response...

Page 37: ...dures No response to text indicates that the 2845 did not rec ognize or detected a VRC error in a control character STX or ETX The 2701 will time out and the program must send SOH to re establish the 2845 in control mode then reissue the c omplete addressing sequence and message Erase Write Addressed OS Figure 11 The Erase Write Addressed DS command sequence may be addressed to Display Stations on...

Page 38: ...the write portion of the operation are the same as those de scribed in the Write Addressed DS operation An erase function is only performed immediately fol lowing the addressing sequence containing the Erase Write Addressed DS command SOH 2845 Display Control Address etc Therefore subsequent erasures requiTe reinitiating the addressing sequence 38 PROGRAMMING NOTE The erase write addressing seqlle...

Page 39: ... As text charac ters are received from the I O channel they are parity checked and stored in the 2845 printer buffer starting in position 1 After the ETX and LRC characters are received if no VRC or LRC error was detected the 2845 responds with ACK to the I O channel The 2845 does not transfer the text to the Printer until the text is completely received and parity checked by the 2845 Therefore th...

Page 40: ...rint position of the next line The EOM symbol serves as a visual indication that the message has been completed 40 4 An LF code should be used as the lust character of a message when additional separation between messages is desired The LF code causes the print mechanism to be advanced to the lust print position of the next line However unlike the EOM code the LF code does not cause a character to...

Page 41: ... I The Write DS Line Address command causes the cursor of the selected 2265 Display Station to be positioned at the first character position of the specified line The line address is specified by the first character following the STX line control character Subsequent message data text is displayed beginning at the first character position of the addressed line The Write DS Line Address command ena...

Page 42: ...ol characters recognized during execution of a Read command issued to the I O channel are transferred to main storage The following communication control characters sent by the 2845 are recognized by the 2701 during execution of an I O channel Read command Start of Text STX The STX communication control character is the first character of a message sent by the 2845 in response to the Read Addresse...

Page 43: ...on receipt of a message during a Write Addressed DS Erase Write Ad dressed DS Write Printer or Write DS Line Address oper ation if during message transmission the 2845 detects a VRC or LRC error Because the 2701 is in text mode at this time the command ends with Channel End Device End and Unit Check status Data check is set in the sense byte NAK causes an immediate line turnaround End of Transmiss...

Page 44: ...response to a message sequence from the 2845 When so used it terminates the operation but does not restore the keyboard of the selected 2265 End of Transmission EDT EOT is normally used as the first character of the Specific Poll General Poll and the Read Addressed Full DS Buffer addressing sequences The EOT communication control character places the 2845 in control mode and prepares the 2845 to r...

Page 45: ...e Printer as a result of a Write Printer a Specific Poll or a General Poll command a Write Printer command should be reinitiated and following a positive 2845 response ACK the text retransmitted EOT Response to Addressing Sequence The EaT response is a valid response to the Write Printer Specific Poll and General Poll commands If EaT is re ceived in response to commands other than these three the ...

Page 46: ... from the 2845 A maximum of 960 characters can be displayed on a 2265 screen therefore to accommodate a maximum 46 length message from the Display Station the CCW byte count must be 964 This permits receiving STX the 2265 address ETX and a possible CAN character in addition to the complete message text The fITst byte of the message must be STX and will be stored at the location specified by the da...

Page 47: ... Receive next message Read STX X X 964 if any Send STX EOT Write ACK X 2 Read Addressed Send addressing sequence Write SOH X X 4 Full DS Buffer Receive DS buffer contents Read STX X X 964 Send STX EOT Write STX X 2 Write Addressed DS Send addressing sequence Write SOH X X 4 Receive ACK Read ACK X X 1 Send DS message Write STX X X Text plus 2 STX and ETX Erase Write Addressed DS Receive ACK Read AC...

Page 48: ...hannel End Device End and Unit Check Data Check CAN followed by ETX Channel End Device End and Unit Check Remote Equipment Check ACK Channel End Device End NAK response to addressing sequence Channel End Device End and Unit Exception NAK response to a message Channel End Device End and Unit Check Data Check EOT Channel End Device End and Unit Exception No response Channel End Device End and Unit C...

Page 49: ...nditions and interunit cabling of the components comprising the 2845 2265 display system can be found in the publication IBM Remote Multiplexers and Communications Terminals Installation Manual Physical Planning Form GA27 3006 Installation Planning Data Installation Planning Data 49 ...

Page 50: ...1 Figure 14 2265Feature Chart 50 I World Trade I 115V 60 Hz 9901 I OR I 112 5V 50 Hz 2810 I OR 195V 50 Hz 2812 I OR I 220V 50 Hz 2813 I OR I 235V 50 Hz 2814 2265 Base Machine American English Language 2750 OIR I United Kingdom Language 2927 I OR Language 2928 I OR I German Language 2929 Special Feature Alphameric Keyboard 4766 ...

Page 51: ...ure Chart 9901 dR I 112 5V 50 Hz 2810 6R I 123 5V 50 Hz 281 I dR I 195V 50 Hz 2812 dR 220V 50 Hz 2813 OR I 235V 50 Hz 2814 2845 Special Features Tab Base 7801 Machine American English line 1053 Language t Addressing Adapter 2750 4801 15 X 64 bR 7927 I 6R United Kingdom Destructive I Language Cursor 1053 2927 3301 Adapter dR 12 X 80 7928 1 French Language 2928 dR 1 German Language 2929 Appendix A F...

Page 52: ...er sets matching those of the four Language Features The print elements permit SPACE ERASE ADVANCE Figure 16 2265 United Kingdom Keyboard ESPACE EFFACE Figure 17 2265 French Keyboard 52 the Printer Adapter Feature to be used in conjunction with any of the Language Features with complete language com patibility Except for differences in the graphic representation of certain codes keyboard arrangeme...

Page 53: ...LS INDICATORS AND SWITCHES Table 10 lists the labels indicators and switches as they appear on the equipment when the United Kingdom French or German Language Feature is installed Those shown for the United Kingdom Language Feature are identical to the American English designations The switches and indicators are described under 2265 Display Operator Controls and Indicators Table 10 United Kingdom...

Page 54: ... 4A 01001011 48 01001100 4C 01001101 40 01001110 4E 01001111 4F 0 01010000 50 1 01010001 51 2 01010010 52 3 01010011 53 4 01010100 54 5 01010101 55 6 01010110 56 7 01010111 57 8 01011000 58 9 01011001 59 01011010 5A 01011011 58 01011100 5C 54 Character A 8 C 0 E F G H I J K L M N 0 P Q R S T U V W X Y Z I LF USASCII 8 Hexadecimal Code 87654321 Representation 01011101 50 01011110 5E 01011111 5F 101...

Page 55: ...a turnaround time of 8 5 ms when operating over four wire facilities or equivalent Appendix D Timing Considerations 2701 LINE TIMEOUT The 2701 line timeout period must be considered when programming the 2845 When the 2701 receives no reply from an addressed 2845 within 2 seconds after transmitting the last character of a response or sequence the 2701 times out and the operation is terminated It is...

Page 56: ... to 2701 2701 Turnaround P 1 1 P 0 015 ms number of miles one way A 2X CX t H CX 1 1 STX EOT D data set turnaround time 200 ms 202D1 150 ms 201B1 8 5 ms 201B1 strapped t 23 ms average T dependent upon I O channel timing usually Iess than 1 ms C total number of characters including address control and text x 4 ms 2400 bps 8 ms 1200 bps or equivalent First two characters of the addressing sequence S...

Page 57: ...ation 10 World Trade Operation 10 Destructive Cursor Feature 10 Symbol 16 Display Format Features 9 Display System Operation Typical 10 End of Message Symbol 16 End of Text 27 30 42 EOM Symbol 16 EOT 27 30 42 Erase Write Addressed DS 37 Error Recovery Procedures 45 ETX 27 30 42 Feature Charts 50 Features Special 9 Specify 8 French Keyboard 52 Language Feature 52 Print Element 53 General Descriptio...

Page 58: ...3 Printer 30 Specific Poll to 2265 Display Station 30 Specify Features 8 Start of Heading 27 44 Start of Message Symbol 19 58 Start of Text 27 30 42 Status Bytes 48 STX 27 30 42 Summary of Sequences and Responses 42 Switches 12 53 System Configuration 10 Tab Feature Description 10 Operation 23 Test Procedure 23 Text Mode 27 Timeout 2701 Line 55 Timings Command Execution 55 Interface 55 Transmissio...

Page 59: ...own experience rate this publication As a reference source As a text Very Good Very Good Good Good Fair Fair Poor Poor Very Poor Very Poor What is your occupation We would appreciate your other comments please give specific page and line references where appropriate If you wish a reply be sure to include your name and address Thank you for your cooperation No postage necessary if mailed in the U S...

Page 60: ... note Requests for copies of publications and for assistance in utilizing your IBM sys tem should be directed to your IBM representative or to the IBM sales office serving your locality fold fold BUSINESS REPLY MAIL NO POSTAGE STAMP NECESSARY IF MAl LED IN THE UNITED STATES POSTAGE WILL BE PAID BY IBM CORPORATION NEIGHBORHOOD ROAD KINGSTON N Y 12401 ATTENTION PRODUCT PUBLICATIONS DEPT 520 BUILDING...

Page 61: ...2 International Business Machines Corporation Data Processing Division 112 East Post Road White Plains N Y l080t USA Only IBM World Trade Corporation 821 United Nations Plaza New York New York 10017 International ...

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