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Stim Switch User Manual
Rev. 2.00
® Page 5
LB-0357
The NeuroPort Plug that attaches to the bottom of the Headstage Housing provides the interface
between the patient electrodes and the Stim Switch System.
Connection to the patient electrodes
is described in section 2.4.3 below.
Each Headstage Module is built around connectors
from Samtec and is designed to mate with the ICS
family of array holders from Blackrock
Microsystems. Please refer to the NeuroPort User
Manual or contact a Blackrock sales representative
for more information on the different connectors
available for use with the Stim Switch headstage
module.
Each Channel on the individual Headstage Modules
is rated for a maximum voltage of ±15 V with
respect to ground and can source or sink a
maximum of 30 mA of current. The diagram on the
right illustrates the internal connections of a single
channel in the Headstage Module. The Amplifier
Blanking Switch is closed during Read mode and open during Stimulation and Blanking modes.
The Stimulator switch is only closed when the Headstage Module is configured in Stimulation
mode and the channel has been selected for Stimulation using the StimComm software. The
table below defines the state of each switch for a single channel for any given set of inputs.
Table 2-2: Headstage Module Switching States
Channel State Amplifier Blanking Switch Stimulator Switch
Read Closed Open
Blanking Open Open
Stimulation (channel not set for stimulation) Open Open
Stimulation (channel set for stimulation) Open Closed
2.4 Computer Setup
The Stim Switch connects to a USB
port on the computer through a
standard USB A-B cable. The Stim
Switch uses an internal USB to serial
converter and will appear as a COM
port on your computer. Be sure that
the COM assigned by your computer
to the Stim Switch matches the COM
port settings in the StimComm
Software (See Menu Options in
section 3 for instructions on changing
COM port settings).
WARNING: The Stim Switch should only be used with an IEC 60950 Computer. The
computer must be placed outside of the patient environment which is defined as an area
1.5m (4.92 feet) from the patient.
Figure 2-6: Switch Schematic. R
stim
= 500 M
Ω
and R
elec
= 1k
Ω
Figure 2-7 Stim Switch Computer Interface