BIOPAC Systems MP36 - Back Panel; Analog Out Port - Low Voltage Stimulator; USB Connection; Headphone Output

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BIOPAC Hardware | MP36/35/45 | Page 3 - 11 Updated: 12.23.2013
Back Panel
Back Panel, MP36/35
The back panel of the MP36/35 has an analog output port, a USB port, an I/O Port, a Trigger Port, a DC input, a
fuse holder, a power switch, and the unit’s serial number.
The back panel of the MP45 has a USB cable and headphone port.
Analog Out Port – Low Voltage Stimulator
There is one 9-pin m
ale “D” analog output po
rt on the back of the MP36/35 that allows signals to be amplified
and sent out to devices such as headphones. On the MP36, Analog Out is built-in low voltage stimulator.
Not available for MP45.
USB Connection
The MP36/35 connects to the computer via a USB Port, located just below the word USB.
 Uses a standard USB connector.
 Should only be used to connect the MP36/35 to a PC or Macintosh.
The MP45 USB cable is a full-speed USB connector and should only be used to connect the MP45 to a
PC or Mac USB port.
Headphone Output
 Accepts a standard (1/4” or 6.3mm) stereo headphone jack; functional for MP36 and MP45 only.
I/O Port (MP36/35 only)
 Accepts
a DB 25 Female
connector.
 Input/Output port used to connect digital devices to the MP36/35.
Trigger Input (MP36/35 only)
 Accepts a male BNC connector.
 Input
port used to send trigger signals from another device to the MP36/35.
 MP system external trigger inputs are TTL compatible—this means that one needs to send the external
trigger input 0 volts for a TTL low and 5 volts for a TTL high.
The external trigger inputs are equipped with internal pull-up resistors—this means that they
automatically sit at TTL high, if left unattached.
 This is a common and helpful implementation, because all one requires to implement an external
trigger is to pull the external trigger input low.
 This implementation is typically performed with an external switch placed between the external
trigger input and ground.
 When the switch is closed the external trigger input is pulled to TTL low.
 When the switch is opened the external trigger input is pulled back (by the internal pull-
up resistor) to TTL high.
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