Pine Research MSR 636A, Руководство пользователя

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DRU10002 (REV 004 / JAN 2017)
External control of the rotation rate may involve a signal connection between a
potentiostat from one manufacturer being connected to a rotator from another
manufacturer. The signals on these various instruments may have been
calibrated to different tolerances by each manufacturer. Small signal level
differences within these tolerances can add up, causing the actual rotation rate
(as displayed on the control unit) to differ slightly from the specified rotation rate
(as entered by the user of the potentiostat software).
4.7.4 External Motor Stop Control
An external digital signal can be applied across the MOTOR STOP banana jacks
on the back panel to bring the rotator to a complete stop (see Figure 2.4). This
digital signal can be used by a potentiostat or other external instrument to assure
that the rotation rate is actually zero. The logic for this digital signal may be either
“active HIGH” or “active LOW”.
For the Pine MSR rotator, the MOTOR STOP is configured at the factory to use
“ active HIGH ” logic . If desired, a jumper setting inside the control box can be
configured to use the opposite logic (see Section 6.8 for details).
If the MOTOR STOP logic is configured to be “active HIGH ”, then the motor is
allowed to rotate if a signal greater than 2.0 volts is applied across the MOTOR
STOP banana jacks. If the two banana jacks are shorted together (i.e., if the
MOTOR STOP stop signal is driven to ground), then the motor stops rotating.
If the MOTOR STOP logic is configured to be “active LOW”, then the motor will stop
if a signal greater than 2.0 volts is applied across the MOTOR STOP banana jacks.
If the two banana jacks are shorted together (i.e., if the MOTOR STOP signal is
driven to ground), then the motor is allowed to rotate.
Note:
When the control unit is configured for “active HIGH” logic and
when no connections are made to the MOTOR STOP banana jacks,
the motor is allowed to rotate
. An internal “pull up” circuit assures
that the motor stop signal remains “high” in this cas e.