THORLABS BBD301, Руководство пользователя

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BBD30x Series Brushless DC Servo Controllers
Page 67
A.3.2 Differential Outputs
All differential outputs (QA, QB and IX/Ref) are driven by an AM26C31 line driver, with
a 130
Ω
resistor between the output of the line driver and the connector pin. When the
stage is being controlled by a joystick, in the absence of a PC, these outputs could be
connected to an oscilloscope or custom circuit to facilitate monitoring of the position
output.
Fig. A.4 Differential Output Schematic
A.3.3 Digital Outputs
The digital outputs are via a 5V CMOS logic gate with a 330
Ω
series resistor for
protection (see Figure A.5). They behave as +5 V voltage sources with 330
Ω
in
series when the outputs are logic HIGH, and 330
Ω
to ground when logic LOW.
The resistor limits the current to a 15 mA maximum for any load, provided the
output is not connected to voltages outside the 0 to +5 V range.
Fig. A.5 Digital Output Schematic
In some applications, the digital outputs may be required to control external equipment
that has optocoupler type inputs (such as PLCs). As the outputs are actively driven, they
can be used here to directly drive most optocouplers and the +5 V supply available on
pins 20 and 21 can be used to provide power for these.
Please see the APTServer helpfile for details on software calls used to control these
logic IO.
The voltage that external equipment applies to the digital outputs must be
within the range 0 V and +5 V DC, or damage to the outputs may occur.
Caution
330 Ω
5 V
Out
Gnd
AM26C31
130 Ω
130 Ω
QA+ (QB+, IX+)
QA- (QB-, IX-)