Sync Interface
Contents
1. TOVA Test of Variables of Attention T O V A Synchronization Interface The TOVA Company 3021 Cerritos Avenue Los Alamitos CA 90720 USA 800 729 2886 562 594 7700 info tovatest com http Awww tovatest com T O V A Synchronization Interface Phone Fax Referrals Email Web Andrew Greenberg MS The TOVA Company 3321 Cerritos Avenue Los Alamitos CA 90720 USA 800 PAY ATTN or 800 729 2886 or 562 594 7700 800 452 6919 or 562 594 7770 800 REF TOVA or 800 733 8682 info tovatest com http www tovatest com Copyright 2013 2015 The TOVA Company All Rights Reserved Test Of Variables of Attention abbreviated T O V A is a registered trademark of The TOVA Company No part of this manual may be distributed without permission of The TOVA Company Orders of this manual should be directed to The TOVA Company 3321 Cerritos Avenue Los Alamitos CA 90720 USA 800 PAY ATTN 800 729 2886 1 562 594 7700 Fax 800 452 6919 1 562 594 7770 Printed in the United States of America Contents Introduction Setup and Testing Setting up and configuring your T O V A sync interface cccccccccc a a Testing your sync interface c ccccccccll a a a a Output Modes Digital or Analog Digital output mode cee ow kb dR Ss A ADADE ow Se da ow da DO ia kb eae he tah deeded eee PRESA MALAS Rm eee ere Vout Customizable output high logic level 1 a Analog output Mode 2 a a Decoding the a2. BK Digi Key S9202 ND The entire even row pins 2 4 6 8 10 are ground in order to separate each signal with a ground if a ribbon cable is used see Ribbon cable page 8 B1 Stimulus B2 Target BO Switch e B3 Testing Vout GND Figure 7 T O V A Sync Interface Main connector Standard breakout board To facilitate quick and easy connections to the sync interface we ve provided a simple breakout board Figure 12 The breakout board uses the mating Sullins SFH11 PBPC D05 RA BK Digi Key S9202 ND female connector and breaks out the pins to a standard 0 2 inch spaced Euroterminal breakout connector Figure 8 Photograph of the standard breakout board Figure 9 shows its very simple schematic U out Administering test Target Nontarget Stimulus on off Microswith Ground ON Ol amp ONE Figure 9 Schematic of the standard breakout board Ribbon cable Included in the T O V A Synchronization Interface kit is a 10 position ribbon cable Digi Key H3AAH 1018G Shown in Figure 10 this cable can be used either as a ribbon cable to reach another board or it can be cut in half stripped tinned and used as a direct connection to other equipment Figure 10 Ribbon cable included in kit Figure 11 has the pin out of the stripped cable Isolated breakout board The opto isolated breakout board is available for instrumentation that requires separate grounds from the T O
3. from O to Vout Figure 3 Configuring the Sync Interface 1 If not installed already install the T O V A 8 system according to the T O V A 8 Installation Guide or User s Manual and verify its operation 2 Plug the T O V A sync interface into an open connector on the front panel of the T O V A USB device Both front panel connectors are equivalent so it doesn t matter which connector the sync interface or T O V A microswitch is plugged into 3 Run the T O V A and choose Preferences on the main window 4 In the Preferences dialog choose the Advanced tab and Sync Interface 5 Choose digital or analog output modes and set the maximum output voltage Vout appropriate to your equipment Please read the Output Modes section page 3 to help you choose which mode you want to use 6 The sync interface is now configured The sync interface will automatically output events during both the practice test and T O V A test Testing your sync interface Bit 2 Stimulus type Bit 3 Administering test Help F1 Close Figure 4 Testing the Sync Interface 1 Choose Help on the main window Check T O V A Hardware Sync Control 2 Verify your output mode and Vout setting displayed in this dialog 3 Click on any of the four output checkboxes to activate the outputs of the sync interface You should be able to confirm with your
4. V A testing computer Equipment sensitive to noise and ground loops such as non isolated EEG equipment may need to use the opto isolated breakout board There are some requirements to using the isolated breakout board e Only the digital output mode is supported see note below To change the output mode to digital first make sure the T O V A sync interface is plugged into the GND BO Switch GND B1 Stimulus GND B2 Target GND B3 Testing GND Vout Figure 11 Cut stripped and tinned ribbon cable example with pinout T O V A USB device choose Preferences from the T O V A s main window Advanced Sync Inter face and select the Digital output mode e Vout must be set to 250 5 0V see note below To change Vout to 5 0V first make sure the T O V A sync interface is plugged into the T O V A USB device choose Preferences from the T O V A s main window Advanced Sync Interface and enter 5 0 in the Vout voltage entry field e The isolated board only provides open collector OC outputs This means that the outputs are only actively pulled low and require pull up resistors to be pulled high The isolated breakout board provides 10K pull up resistors that are all connected to the Vin pin via a 0 1 inch pin header that has shorting jumpers pre installed To disable these pull up resistors simply pull off t
5. ce is plugged into the T O V A USB device choose Preferences from the T O V A s main window Advanced Sync Interface The four output bits are combined to create Vout according to Equation 1 Vout 8 x B3 4 x B2 2 x B1 1 BO 1 Figure 6 shows an example of how the analog output varies given T O V A test events Decoding the analog output voltage Use the algorithm in Equation 2 to decode the sampled analog voltage back into four output bits Vout max 1 Vout Zero Lo xX s so Non Target ae c Target g SP Analog Output Sy SS KZ o amp A S O SX O Y O O xO x lt gt 0 S N q O SS ES amp S y o lt x eS Se SS se o N Q Events Figure 6 Analog Output Mode E Analog voltage Vout pin B3 bits mod 8 B2 bits B3 x 8 mod 4 2 B1 bits B3 8 B2 x 4 mod 2 BO bits B3 x 8 B2 x 4 B2 x 2 Physical Interfaces Connectors There is one main connector and four accessory options for electrically connecting the sync interface to your equipment Sync interface main connector Figure 7 shows the main connector on the sync interface and its pin out The connector is a male 2 X 5 0 1 inch keyed header Sullins SBH11 PBPC D05 RA BK Digi Key S9177 ND While any generic female 2 X 5 0 1 inch header will mate with this connector we strongly recommend using a keyed connector such as the Sullins SFH11 PBPC D05 RA
6. e monitor or the auditory stimulus being played on the speakers This bit is low 0 when the stimulus is not being displayed B3 Microswitch Microswitch pressed this bit is high 1 when the microswitch is being pressed and low 0 when the microswitch has been re leased Table 1 Digital output bits Vout Customizable output high logic level In digital output mode the logic low level an is obvious OV ground The logic high level can be set to any voltage from 32 mV to 5 0V in 4 mV increments in order to make it compatible with various families of digital logic This setting is called Vout To change Vout first make sure the T O V A sync interface is plugged into the T O V A USB device choose Preferences from the T O V A s main window Advanced Sync Interface 5 Switch Lessa e 5 I l e 3 Target ee 5 O E D l l nA 4 Stim On RENE RA E 2 Testing gt ss NonTarget K gt Target amp x lt O amp SL XK A SS RS amp w Vl Ps lt ce gt SP lt Ss O e amp lt S S os SW ws s S od vV Events Figure 5 Digital Output Mode Analog output Mode In analog output mode all four bits of the sync interface are combined together on one analog output line that ranges in voltage from OV to the customizable maximum output voltage Vout Vout can be set from 32 mV to 5 0V in steps of 4 mV To change Vout first make sure the T O V A sync interfa
7. equipment or a volt meter that the output is on Output Modes Digital or Analog The sync interface can be set in one of two output modes digital or analog To change output modes first make sure the T O V A sync interface is plugged into the T O V A USB device choose Preferences from the T O V A s main window Advanced Sync Interface Digital output mode In digital output mode the T O V A testing events are given as active high logic levels on four output bits The user can select the logic high level voltage from 32 mV to 5 0 V which allows the sync interface to be compatible with standard logic levels 5 V 3 3V 1 8V etc Output bits Table 1 describes the four output bits that are asserted in the digital output mode Figure 5 shows an example of how these bits correlate to various T O V A test events Bit Number Label Description BO Testing Administering test this bit is it high 1 when the test is being administered and low 0 before and after the test as well as during a pause due to some user interrupt or hardware error B1 Target Target Nontarget this bit is high 1 when the stimulus being dis played is a target and low 0 when the stimulus being displayed is a nontarget Note that this signal is only asserted when stimulus on is high B2 Stimulus on Stimulus on this bit is high 1 when the stimulus is displayed This means either the visual stimulus displayed on th
8. he shorting jumpers Finally the user must provide the appropriate voltage for their high logic level at the pin Vin in order for the pull up resistors to work Figure 13 shows its schematic Users who require an isolated analog output should contact T O V A technical support for information on a circuit that will convert the isolated digital outputs into an isolated analog voltage Figure 12 Photograph of the isolated breakout board MKDSN1 5 6 5 08 U in Administering test Target Nontarget Stimulus on off Microswith Ground AO RWNE Figure 13 Schematic of the isolated breakout board 10
9. nalog output voltage 1 oaoa a a a a a a a Physical Interfaces Connectors Sync interface main connector aooo e a e e a Standard breakout board aoaaa a a A E TE EEE A assabe er E E BL we do E E E ee ee E ee E E Isolated breakout board aoao a a a a a a a a a a a a a a a Introduction The T O V A Synchronization Interface or sync interface is an add on to the standard T O V A 8 system that allows T O V A users to synchronize events in the T O V A test with other laboratory equipment The sync interface gets event messages from the T O V A USB device and formats the event information into a digital or analog output The user s laboratory equipment e g EEG equipment then records this sync interface s outputs on 1 4 auxiliary input channels By recording T O V A events in the raw data stream of the user s equipment the two devices can now be precisely correlated in time Note that the sync interface does not record data it is an output only device A classic example of this setup would be connecting the T O V A sync interface to an EEG system administering the T O V A and then looking at the timing amplitude and other aspects of the P300 response to the T O V A test s target and nontarget stimuli Figure 1 The T O V A Synchronization Interface System Requirements e A fully working T O V A 8 installation on a Windows Macintosh or Linux PC For T O V A 8 system require ments please see
10. the T O V A User s Manual or the T O V A website at http www tovatest com e synchronization enabled T O V A USB device see Figure 2 Synchronization enabled USB devices have two microswitch ports on their front face panel instead of the usual one The sync enabled USB device should be provided as part of the sync interface kit e Data acquisition equipment with either of the following 1 4 digital inputs that can record a user selectable digital high level of more than 32 mV but less than 5 0V 1 analog auxiliary input channel that can record a user selectable maximum analog voltage of more than 32 mV but less than 5 0V Figure 2 T 0 V A USB device with extra front panel connector What s in the T O V A sync interface kit e The T O V A synchronization interface e standard breakout board e An opto isolated breakout board e An 18 inch ribbon cable Setup and Testing WARNING The sync interface will automatically output events during the practice test and T O V A test Please configure your sync interface BEFORE connecting it to your lab equipment Setting up and configuring your T O V A sync interface 5 0 Y Digital output Vout sets the digital high level of the four output bits Analog output Vout sets the maximum value of the Vout line which is then scaled by the output bits This changes Vout into a single analog channel with all four bits represented as a voltage
Download Pdf Manuals
Related Search