Digitimer D188 Manuel de l'opérateur - Page 19

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Digitimer Ltd – D188 Operator's Manual

Version 1.2

It is also important that the duration of an electrical stimulus is considered when programming a

switching protocol. We recommend that any stimulus delivery events are bracketed by longer periods of

D188 channel activation to ensure that the stimulation pulse has ceased and fully dissipated before the

channel being stimulated through is changed.

Digital Control Voltage Requirements

In the 1:1 mode the D188 requires +4V (@ 50µA), but when operated in 4:8 control mode, i.e. specifying

the active channel using a 4-bit binary string rather than using 8 digital inputs, then the required voltage

is lower and a device generating +3.3V would be adequate.

Using the API for Third Party Software Control

The D188 control software includes an API. While we recommend using digital control to switch channels

for applications that require precise timing, it is possible to use third party software to switch channels

via the USB connection.

During installation of the D188 software, the DGD18API.DLL is placed in the Windows System folders

(System32 and SysWOW64).

To assist developers we provide a sample C++ example program within a zip file (D188-VS-

C++Example.zip), located in C:\Users\<username>\Documents\Digitimer Limited

Example Applications

Below we include an example application which illustrates how the D188 has been used. We invite all

D188 users to submit a brief summary of the application and list of hardware and software they are

using, so we can add details to this section.

Application 1: Tactile stimulation of multiple digits (sequentially) across both

hands.

The aim was to develop a diagnostic test for somatosensory cortical reorganisation in patients with

Complex Regional Pain Syndrome. Stimulation was applied no faster than 1Hz, with stimuli either

repeating on the same digit or switching digits in a manner that appears random to the subject, but

follows a pre-programmed sequence.

Hardware

Labjack U3-HV (www.labjack.com) sends instructions to the Digitimer D188 to change channel (digit

stimulated) and to the Digitimer DS7A to stimulate via digital ring electrodes.

Software

Matlab (2015 version, www.mathworks.com) programming creates stimulation sequences and

instructions to the Labjack which time the digit changes and digit stimulations via the D188 and DS7A

respectively. Control of the Labjack requires specific drivers and commands supplied by Labjack for use in

Matlab.