Revision 15.00 / LB-0028
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Cerebus Instructions for Use
14
4.
Digital Input:
Digital events can be recorded through the 16-bit DB37 input port. The pinout is shown
below. DS is a digital strobe pin. D0-15 are data pins. EOP is reserved. SYNC is an output
pin and can be used with external equipment to indicate when the port is scanned.
Input range is 0V-5V TTL levels. The port is polled every 1/30000 of a second. Strobed
data is buffered up to 10 strobes per 1/30000 of a second and is latched on the rising
edge of the DS pin.
5.
Serial I/O:
The port is an RS232 DB9 digital input/output port. The pin diagram is shown below.
Currently, the NSP firmware software only supports this port as an input.
Pin 2 is “Receive Data”, pin 3 is “Transmit Data”, and pin 5 is “Ground”. The
configuration of the port is: Baud rate: 115200, Data bits: 8, Parity: none, Stop bits: 1,
Flow control: disabled.
6.
Analog Outputs:
Four ±5.0 V analog output BNC connectors can be used to send monitoring signals or
stimulus waveforms to other connectors.
7.
Audio Output:
The system sends a ±1.5 V line-level audio signal of the selected data channel to two
BNC ports and one 3.5mm female stereo audio connector simultaneously.
8.
Digital Outputs:
Four single-bit digital BNC outputs can be programmed for monitoring or timing
functions. These ports can be setup to send a TTL signal if spike activity is detected on
any channel. They can also be configured to output a digital pulse train at a user-defined
frequency and duty cycle. Digital Output 1 can also be used for syncing external
equipment by sending a unique pulse every 14 seconds. The entire sync pattern will
repeat every hour. See the Central Software Suite User Manual for more details.
9.
Sync Port:
A synchronization pulse can be set as an optional line to inform external equipment
when the NSP neural signal inputs and front panel ports are scanned. It is active on the
Figure 10- Digital input pin diagram.
Figure 11- Serial I/O pin diagram.
