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IOtech Digital488, Manual

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IOtech Digital488 Manual Download Page 39

The 

GPIB

 transfers information in a similar way.  This method of data transfer is called 

handshaking

.  

More on this later. 

For data transfer on the 

IEEE 488

, the 

Active Controller

 must… 

a) 

Unlisten

 all devices to protect against eavesdroppers. 

b) Designate 

who 

will 

talk

 by 

addressing

 a device to 

talk

. 

c) 

Designate all the devices that are to 

listen

 by 

addressing

 those 

 devices 

to 

listen

. 

d) 

Indicate to all devices that the data transfer can take place. 

 

 

 

 

 

 

 

 

 

4-2, IEEE 488 Primer 

11-20-01

 

Digital488 User’s Manual

 

Summary of Contents for Digital488

Page 1: ...ized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In stock Re...

Page 2: ...Digital I O Interface IOtech Inc 25971 Cannon Road Cleveland OH 44146 1833 Phone 440 439 4091 Fax 440 439 4093 E mail Product Information sales iotech com E mail Technical Support productsupport iotec...

Page 3: ...n described in this manual can present serious safety hazards or cause equipment damage This warning symbol is used in this manual or on the equipment to warn of possible injury or death from electric...

Page 4: ...EDR 2 6 Inhibit 2 6 Trigger 2 6 Service 2 7 IEEE 488 Bus Implementation 2 7 My Talk Address MTA 2 7 My Listen Address MLA 2 8 Device Clear DCL and SDC 2 8 Group Execute Trigger GET 2 8 Interface Clear...

Page 5: ...Address Group TAG 4 5 Untalk UNT 4 5 Local Lockout LLO 4 5 Device Clear DCL 4 5 Selected Device Clear SDC 4 5 Serial Poll Disable SPD 4 5 Serial Poll Enable SPE 4 5 Group Execute Trigger GET 4 5 Take...

Page 6: ...ler to interrogate the programmed status of the Digital488 at any time A self test is initiated at power on which checks for proper RAM and ROM operation When addressed to talk the Digital 488 will ou...

Page 7: ...female CN 22 IEEE 488 Multi tap bus strip four female connectors in parallel CN 23 IEEE 488 panel mount feed through connector male and female Rack488 3 5 1 4 by 19 rack mount for one Digital488 Rack...

Page 8: ...Not Applicable CE Category 1 for all terminals Dimensions 188 mm deep x 140 mm wide x 68 mm high 7 39 x 5 5 x 2 68 Weight 1 55 kg 3 6 lbs Operating Environment Standard Indoor 0 to 50 C 0 to 70 RH to...

Page 9: ...death Digital I O Configuration Four 8 bit ports programmable as inputs or outputs Transistor Transistor Logic TTL Levels Outputs will drive 2 TTL loads Connector One 40 pin header organized as two ro...

Page 10: ...ernal LEDs are connected to VCC through a resistor network The pin out table for the LED status header is located in Figure 1 1 PIN LED CONNECTOR 1 Error Cathode 2 Error Anode 3 SRQ Cathode 4 SRQ Anod...

Page 11: ...ce Clear GET Group Execute Trigger GTL Go To Local LA Listener Active LAG Listen Address Group LF Line Feed LLO Local Lock Out MLA My Listen Address MTA My Talk Address PPC Parallel Poll Configure PPU...

Page 12: ...TR 2 115V or TR 2E 220V Every Digital488 32 OEM is shipped with the following Digital488 32 OEM IEEE Digital I O Converter Digital488 User s Manual CA 106 1 foot ribbon cable to IEEE488 connector Mac...

Page 13: ...ain circuit board into the previously noted slot and finish reassembly by tightening the four screws into the rear panel IEEE 488 Address Selection The IEEE 488 bus address is set by SW1 1 through SW1...

Page 14: ...ata lines which can be programmed in groups of 8 as either input or output At power on all 40 bits are in the input mode Each 8 bit group is one port beginning with Port 1 as the least significant 8 b...

Page 15: ...ATA PORT2 Input or Output Pin 9 is bit 1 LSB Pin 16 is bit 8 MSB 9 thru 16 17 thru 24 DATA PORT3 Input or Output Pin 17 is bit 1 LSB Pin 24 is bit 8 MSB 17 thru 24 25 thru 32 DATA PORT4 Input or Outpu...

Page 16: ...r Interface Clear IFC command has been sent on the bus The Clear line is normally active high The Invert command I8 will program it active low The Handshake command H0 can pulse the Clear line indepen...

Page 17: ...the Invert command I1 The Inhibit line can be programmed independent of any I O operations with the Inhibit command Qn Refer to the following diagram for timing relationships The Inhibit line is asser...

Page 18: ...will wait for the selected EDR transition before reading the data and formatting it for output If the EDR line has transitioned prior to being addressed to talk the data read at the time of EDR will...

Page 19: ...gnized Device Clear DCL and SDC In the F0 thru F4 formats Device Clear resets the Digital488 to power on defaults and pulses the Clear output line for approximately 50 microseconds In the high speed b...

Page 20: ...one second while the Digital488 performs an internal ROM and RAM self check At the end of this self check all indicators should turn off except POWER If you obtain the above response then your Digital...

Page 21: ...2 10 Getting Started 11 19 01 Digital488 User s Manual...

Page 22: ...nfigure command to be valid The Strobe output line is not pulsed when the Bit Set command is sent An Bit n 1 thru 40 is set to logic one Example CLEAR 718 reset the Digital488 OUTPUT 718 C5X configure...

Page 23: ...is sent on talk Example CLEAR 718 reset the Digital488 OUTPUT 718 P0C1X port1 as output ports 2 5 as input OUTPUT 718 G1X select only input ports ENTER 718 A read data from the input ports DISP A dis...

Page 24: ...rpreted as data and the suffix Z is not used For the high speed binary F5 format all bytes received are treated as data and the prefix and suffix are not used Refer to the Fn command for additional de...

Page 25: ...DR captured data EDR cannot be used to capture data in the F5 high speed binary format The EDR signal must be at least 1 microsecond wide and should have a rise and fall time of less than 1 0 microsec...

Page 26: ...F0 ASCII Hexadecimal 4 bits per character F1 ASCII Character 4 bits per character F2 ASCII Binary 1 bit per character F3 ASCII Decimal 8 bits per number F4 Binary each byte represents 8 bits F5 High...

Page 27: ...ved for output to the digital ports must be contained within a prefix D and a suffix Z If the amount of data sent is less than the number of bits programmed as outputs the least significant bits will...

Page 28: ...tal488 will generate a conflict error and ignore the entire command string The Data Strobe output is pulse for approximately 50 microseconds after new data is output on the selected port s When the Di...

Page 29: ...tors with the exception of EOI are not appended to the output After output the Digital488 must be re addressed to talk to perform subsequent reads EDR R1 may also be used to capture data in this forma...

Page 30: ...nvert In The Invert command is used to change the polarity of the handshake and data lines At power up all handshake and control lines are active high logic one 5 volts The Invert command can selectiv...

Page 31: ...e SRQ commands are contained within the same command string each SRQ command should be followed by an Execute command X The programmed SRQ modes will remain enabled until the M0 command is sent or the...

Page 32: ...ce Input transition DIO2 2 EDR input transition DIO3 4 Bus error DIO4 8 Test error DIO5 16 Ready for more commands DIO6 32 not assigned always 0 DIO7 64 Service Request bit DIO8 MSB 128 not assigned a...

Page 33: ...our denotes the Digital488 was the source of the SRQ Sixteen denotes the Digital488 is READY for more commands Four denotes a Bus error When serial polled the SRQ LED will turn off Status Un The Statu...

Page 34: ...hru 5 are inputs C3 Ports 1 thru 3 are outputs ports 4 and 5 are inputs C4 Ports 1 thru 4 are outputs port 5 is an input C5 All ports are outputs E Error Message 0 No error 1 Unrecognized command ex W...

Page 35: ...selected P5 Port 5 selected R Data Ready R0 Data is not latched but is read when Digital 488 is addressed to talk R1 Data is latched on EDR transition T Test LED T0 Perform RAM and ROM test Y Termina...

Page 36: ...nd ROM test The T0 command will cause the Digital488 to initiate a ROM RAM test If the test is successful all LEDs will flash for one half second If a test fails the Error LED will remain illuminated...

Page 37: ...3 16 Command Descriptions 7 17 01 Digital488 User s Manual...

Page 38: ...rs and allowing them to have their say On the bus the device which is recognized to speak is the Active Talker There can only be one Talker at a time if the information transferred is to be clearly un...

Page 39: ...488 the Active Controller must a Unlisten all devices to protect against eavesdroppers b Designate who will talk by addressing a device to talk c Designate all the devices that are to listen by addre...

Page 40: ...ed then the information contained on the data lines is to be interpreted as a multiline command If it is not then that information is to be interpreted as data for the Active Listeners The Active Cont...

Page 41: ...hat the data on the bus is valid Not Ready for Data NRFD This line is used by the Listeners to inform the Talker when they are ready to accept new data The Talker must wait for each Listener to unasse...

Page 42: ...ells bus devices to Untalk The same as Unaddressed to Talk 5F Local Lockout LLO Issuing the LLO command prevents manual control of the instrument s functions 11 Device Clear DCL This command causes al...

Page 43: ...e or Tell me when something is wrong Since SRQ is a single line command there is no way for the Controller to determine which device requested the service without additional information This informati...

Page 44: ...al time interrupts for the firmware operating system The front panel annunciators are also driven by U104 through an inverter U113 74LS04 The IEEE 488 bus interface is accomplished by a TMS9914A U106...

Page 45: ...Digital488 Mother Board Component Layout 5 2 Service Information 916895 Digital488 User s Manual...

Page 46: ...1 CN 2 IEEE 488 Connector R101 R 1 68K 68K 1 4w carbon R102 RN 4 4 7K 4 7K x 7 SIP R104 RN 2 470 470 x 5 SIP R105 R 2 39 39 1w carbon U102 Digital488 600 Programmed EPROM U103 IC 41 6264 15 8K x 8 CMO...

Page 47: ...tion C201 C205 C 5 1 Ceramic 25v C123 C 5 1 Ceramic 25v R201 R202 R 1 1K 1K 1 4w carbon R206 R 1 1K 1K 1 4w carbon S201 SW 6 8 8 Pole DIP U201 IC 1 MC68B09P Microprocessor U202 U204 IC 2 68B21 PIA U20...

Page 48: ...Digital488 32 OEM Component Layout Digital488 User s Manual 916895 Service Information 5 5...

Page 49: ...Digital488 OEM Component Layout 5 6 Service Information 916895 Digital488 User s Manual...

Page 50: ...5 25 25 x 2 0 1 Header J104 CN 32 2 2 position Mate N Loc Socket R101 R 1 68K 68K 1 4w carbon R102 RN 4 4 7K 4 7K x 7 SIP R103 RN 2 470 470 x 5 SIP S101 SW 6 8 8 Pole DIP U101 IC 1 MC68B09P Microproce...

Page 51: ...5 8 Service Information 916895 Digital488 User s Manual...

Page 52: ...are outputs ports 4 and 5 are inputs C4 Ports 1 thru 4 are outputs port 5 is an input C5 All ports are outputs Data Dn Z Data to be outputted is entered after D and terminated by Z Data Ready R0 Data...

Page 53: ...g edge sensitive Port P0 All ports selected P1 Port 1 selected P2 Port 2 selected P3 Port 3 selected P4 Port 4 selected P5 Port 5 selected SRQ Mask M0 SRQ is disabled M1 SRQ on Service Input transitio...

Page 54: ...SI GET TCT Universal Command Group UCG 10 16 11 17 12 18 13 19 14 20 15 21 16 22 17 23 DLE DC1 DC2 DC3 DC4 NAK SYN ETB LLO DCL PPU 18 24 19 25 1A 26 1B 27 1C 28 1D 29 1E 30 1F 31 CAN EM SUB ESC FS GS...

Page 55: ...3 54 84 55 85 56 86 57 87 P Q R S T U V W 16 17 18 19 20 21 22 23 58 88 59 89 5A 90 5B 91 5C 92 5D 93 5E 94 5F 95 X Y Z _ 24 25 26 27 28 29 30 UNT Secondary Command Group SCG 60 96 61 97 62 98 63 99 6...

Page 56: ...ice Control 1 Local Lockout LLO 18 12 R DC2 Device Control 2 None 19 13 S DC3 Device Control 3 None 20 14 T DC4 Device Control 4 Device Clear DCL 21 15 U NAK Negative Acknowledgement Parallel Poll Unc...

Page 57: ...ot defined Normally used for ON controls 18 Device Control 2 DC2 Usually user defined 19 Device Control 3 DC3 Not defined Normally used for OFF controls 20 Device Control 4 DC4 Usually user defined 21...

Page 58: ...2A Asterisk Bus address 10 43 2B Plus Sign Bus address 11 44 2C Comma Bus address 12 45 2D Hyphen or Minus Sign Bus address 13 46 2E Period Bus address 14 47 2F Slash Bus address 15 Listen Address Gro...

Page 59: ...K Bus address 11 76 4C L Capital L Bus address 12 77 4D M Capital M Bus address 13 78 4E N Capital N Bus address 14 79 4F O Capital O Bus address 15 Talk Address Group TAG 80 50 P Capital P Bus addres...

Page 60: ...wercase K Command 11 108 6C l Lowercase L Command 12 109 6D m Lowercase M Command 13 110 6E n Lowercase N Command 14 111 6F o Lowercase O Command 15 Secondary Command Group SCG 112 70 p Lowercase P Co...

Page 61: ...B 8 Notes...

Page 62: ...Appendix C Digital488 OEM Mechanical Dimensions Board Dimensions C 1...

Page 63: ...IEEE Connector Mounting and Hole Punch Out C 2...

Page 64: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...

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