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INSTRUTECH CORPORATION
VR-10B USER’S MANUAL
8. Trigger segment:
This is a four digit hexadecimal number ranging from one to six which sets the
protocol segment that the sync trigger pulse will be timed from. When the
respective segment is started the trigger output delay takes place, and then the
sync trigger pulse is sent. This number must be less than or equal to the number
of segments in use.
9. Number of segments:
This is a four digit hexadecimal number ranging from one to six that indicates the
number of segments that are to be used in the stim protocol.
10. Channel two trigger:
This is a four digit hexadecimal number that is broken down into binary bits. The
high order eight bits are always zero, as is bit zero. Bits one through six
correspond to the segments in the stim protocol. Bit one corresponds to segment
one and bit six corresponds to segment six. If this bit is set to one, the trigger two
output will be active when the given segment is active. Bit seven indicates an
output inversion. If this bit is zero the trigger output will go high when the trigger
output is active. If this bit is one, then the trigger output will go low when active.
Example: sending 0086h to the VR-10B will cause the trigger two output to go
low when segments one and two are active.
11. Segment Descriptions:
Parameters 11a through 11f are to be entered for each segment (up to six, as
specified in the number of segments parameter, number nine above). They are
entered in series with parameters 11a through 11f for segment one followed by
parameters 11a through 11f for segment two, etc.
11a.
Initial Amplitude:
This is a four digit signed hexadecimal number from 8000h to 7FFFh. It
specifies the amplitude of this segment at the start of a stim series. The
increment value for this parameter is set in the same fashion as number
six, the holding potential, however the reference point in this case is not
zero, it is the holding potential. Example: if the holding potential is one
volt, and a one volt above holding potential pulse is desired, this value is
set to one volt. If it is desired for this pulse to go to zero volts then this
value must be set to minus one volt.
11b.
Amplitude Change:
This is a four digit signed hexadecimal number indicating the value to
increase or decrease the amplitude of this segment during its execution in
each series. This value is set as in 11a. Example: if this parameter is set
to one millivolt, the initial amplitude is set to ten millivolts, and the
number of cycles is set to ten, then the first cycle would have an amplitude
of ten millivolts, the second would be eleven millivolts, the third would be
twelve millivolts, this would continue until the tenth cycle is nineteen
millivolts.
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