Measurement-computing Digital HS Manuel d'utilisateur

Digital HSUser’s ManualIOtech, Inc.25971 Cannon RoadCleveland, OH 44146Phone: (440) 439-4091Fax: (440) 439-4093E-mail: [email protected]:

2.2.2 Internal Switch SettingsThe internal settings on the Digital488HS/32 are for the line voltage, input and outputsettings and the PTO default set

1. The line voltage selection switch (S7) is located below the main power suplytransformer (T2). Insert the tip of a small screwdriver into the slot o

The digital input port contains 16 bits of TTL level inputs, one END line (iEND)input, two handshake lines (iDAV and iBusy), one control line (\iRESET

2.2.2.2.2 S2-2 ist EN Full: Individual Status Message True on Input Port FullEnableThe Full status of the input port can be sensed via parallel p

2.2.2.2.4 S2-4 iBUSY POL: Input Port Busy Handshake LineThe input port busy handshake line, iBusy, is an input line sourced by theDigital488HS/32. It

Polarity Selection for the iEND Control Line2.2.2.2.6 S2-6 iDATA POL: Input Data PolarityThe input data bits can be active high or active low. For ex

2.2.2.2.7 S2-7 and S2-8 SRQ EN SB1 and SRQ EN SB2: Service Requeston External Status Bit 1 and 2The input port has two status line inputs that al

SRQ On External Status Bit 2 (SB2) Selection2.2.2.3 Digital Output Port SetupSeveral features are available for the output port. These features are se

Service Request (SRQ) Enable causes the Digital488HS/32 to generate a servicerequest on the IEEE 488 bus when oBusy transitions from the active (Not E

The Output Data available handshake line, oDAV, is an output line sourced by theDigital488HS/32. It can be configured for active high or active low op

WarrantyYour IOtech warranty is as stated on the product warranty card. You may contact IOtech byphone, fax machine, or e-mail in regard to warranty-

on, iRESET, Device Clear (DCL) or Selected Device Clear (SDC). The default settingfor S3-5 is active high. The oEND is not affected by the \OE line; i

OPEN87654321Active Low oDATAOPEN87654321Active High oDATA (default)S3oDATA POLS3oDATA POLPolarity Selection for the Output Port Data Lines2.2.2.3.7 S

S3CLR POLOPEN87654321OPEN87654321S3CLR POLActive Low oClear Active High oClear (default)Polarity Selection for the oClear Line

2.2.2.4 Power-On Default SettingsSwitches S4 and S5, labeled PTO Default, set the power-on default settings for theDigital488HS/32. The power-on setti

1 345678288 168421DIS IEEE ADDRESSI NO U TMODENDAC HOLDOFF ENABLE1016 161 345678288 168421DIS IEEE ADDRESSI NO U TMODENDAC HOLDOFF ENABLE1016 1616-Bit

1 345678288 168421DIS IEEE ADDRESSI NO U TMODENDAC HOLDOFF ENABLE1016 161 345678288 168421DIS IEEE ADDRESSI NO U TMODENDAC HOLDOFF ENABLE1016 1616-Bit

bus controller to be held off with the NDAC handshake line. This option is set by theswitch labeled NDAC HOLDOFF ENABLE. Factory default setting is ND

1 345678216842110=0 =2 =0 =0 + =160 x 1 1 x 2 0 x 4 0 x 8 1 x 16IEEE Address = 18IEEE Bus Address Selection2.4 IEEE 488 Bus ImplementationThe Dig

2.4.3 Device Clear (DCL and SDC)In response to a DCL or SDC from the IEEE488 bus, the Digital488HS/32 pulses theoClear control line for 1µsec. In add

Untalk (UNT) places the Digital488HS/32 in the Talker Idle State. 2.4.10 Serial Poll ResponseWhenever the Digital488HS/32 generates a service request

Introduction1.1 General DescriptionThe Digital488HS/32 is a high speed IEEE 488 to digital I/O interface providing thefastest possible communication

EMPTY On when the Digital488HS/32's output data port is Empty,indicating the external device has accepted the output data, off when theoutput por

Operation3.1 Digital Output PortThe digital output port contains 16 bits of TTL level outputs, one END line (oEND),two handshake lines (oDAV and oBus

1 bit RegSecond Byte Output RegisterFirst Byte Output RegisterFirst Byte Holding RegisterInternal Data BusEOIoENDDOUT8 thru DOUT15DOUT0 thru DOUT7

3.1.2 Output Port Handshake Lines (oDAV and oBusy)The Output Data Available (oDAV) handshake line is an output line sourced by theDigital488HS/32. Th

3.1.2.1 NDAC Holdoff SelectionThe Digital488HS/32 stops any additional data transfers to the output port while theoBusy handshake line is active, ind

3.1.5 /oRESET Control LineThe /oRESET control line is an active low signal that follows the internal reset line ofthe Digital488HS/32. During power-o

1192037+5 voltsCommoniRESETSB2SB118916Second ByteFirst ByteDIN15 - DIN0iBusyiDAViEND17181937363534 2120Digital Input Port Connector Pinouts15 14 13 12

First Byte Second Byte oEndiDAViBusy>50 ns>150 ns1) The external device waits for iBusy to be unasserted.2) The external device presents data to

fast as the slowest listener. The Digital488HS/32 is capable of transmitting bus dataat a rate greater than 1,000,000 bytes per second.3.3 Serial Pol

3.4 Parallel PollingThe Digital488HS/32 provides the method by which the individual status message(ist), either "true" (1) or "false&q

oTrigger This output line provides an active 1µSec pulse upondetection of the IEEE 488 multiline command GET. Thiscontrol line is switch selectable fo

IEEE 488 Primer4.1 HISTORYThe IEEE 488 bus is an instrumentation communication bus adopted by the Instituteof Electrical and Electronic Engineers in

being Addressed to Listen. This device is then referred to as an Active Listener.Devices which are to ignore the data message are instructed to Unlis

}DIO1-8DAV NRFD NDAC IFC ATN SRQ REN EOI To Other DevicesDevice 1 System Controller Able to Talk, Listen, and ControlDevice 2 DMM Able to Talk a

In the previous discussion, the terms Addressed to Talk and Addressed to Listenwere used. These terms require some clarification.The IEEE 488.1 stand

4.4.2 Interface Clear (IFC)The IFC line is used only by the System Controller. It is used to place all busdevices in a known state. Although device

4.5 HANDSHAKE LINESThe GPIB uses three handshake lines in an "I'm ready - Here's the data - I've got it"sequence. This hands

All ReadyAll ReadyNone ReadyNone ReadyValid Not ValidNot ValidValid1st Data Byte 2nd Data ByteAll AcceptAll AcceptNone AcceptNone AcceptDIO1-8 (comp

This command tells all bus devices to Unlisten. The same as Unaddressed to Listen.($3F)4.7.4 Talk Address Group (TAG)There are 31 (0 to 30) talk add

4.7.9 Serial Poll Disable (SPD)The SPD command disables all devices from sending their Serial Poll status byte.($19)4.7.10 Serial Poll Enable (SPE)A

4.7.15 Parallel Poll Unconfigure (PPU)This disables all devices from responding to a Parallel Poll. ($15)4.8 MORE ON SERVICE REQUESTSMost of the com

1.2 Available AccessoriesAdditional accessories that can be ordered for the Digital488HS/32 include:CA-7-1 1.5 foot IEEE 488 cableCA-7-3 6 foot shie

4.8.2 Parallel PollThe Parallel Poll is another way the Controller can determine which devicerequested service. It provides the who but not necessari

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1192037+5 voltsCommonoRESEToTriggeroClear OE18916oBusyoDAVoENDSecond ByteFirst ByteDOUT15 - DOUT0171819373635 3433 2120Digital Output Port Connector11

Digital Output Port Connector Pin AssignmentsPin Description DirectionDesignation1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Digital Input Port Connector Pin AssignmentsPin Description DirectionDesignation1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 2

The following example uses the Digital488HS/32 as an IEEE 488 to Parallel(Centronics) converter. It uses only the output port in 8-bit mode. The IEEE

The Digital488HS/32 must be set up with the following switch defaults:S1-2 Closed 8-bit Output Port ModeS1-3 Closed NDAC Holdoff DisabledS1-4-8 Variou

IEEE 488.1 Specification Subsets:SH1, AH1, T6, TE0, L3, LE0, SR1, PP2, RL0, DC1, DT1, C0, E2DIO Drivers: Tri-State drivers are used on all DIO lines

1.4 AbbreviationsThe following IEEE 488 abbreviations may be used throughout this manual.addr n IEEE bus address "n"ATN Attention lineCA Co

Getting Started2.1 InspectionThe Digital488HS/32 was carefully inspected, both mechanically and electrically,prior to shipment. After receiving the

2.2.1 Factory DefaultsThe Digital488HS/32 is factory configured to the following switch settings.1 345678288 168421DIS IEEE ADDRESSI NO U TMODENDAC H