Multichannel Systems MEA2100-System Manual - Manual (Page 33)

Hardware
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Rear Panel
Toggle Switch On / Off
Toggle switch for turning the device on and off. The MEA2100-System is switched to status "ON"
when the toggle switch is switched to the left. The device is switched "OFF" when the toggle
switch is switched to the right. If the MEA2100-System is "ON", and the device is connected to
the power line, the Power LED on the front panel of the interface board should light up. If not,
please check the power source and cabling.
Power IN
Connect the power supply unit here. This power supply powers both, the headstage and
the interface board of the MEA2100-System. The device needs 12 V and 2.5 A / 30 W.
Ground
If an additional ground connection is needed, you can connect this plug with an external ground
using a standard common jack (4 mm).
Digital IN / OUT
A Digital IN / OUT for 16 digital in- and output bits is available (68-pin MCS standard connector).
Please read chapter "Pin Layout" (Digital IN / OUT Connector) in the Appendix for more
information about the pin layout of the connector. The Digital IN / OUT connection accepts or
generates standard TTL signals. TTL stands for Transistor-Transistor Logic. A TTL pulse is defined
as a digital signal for communication between two devices. A voltage between 0 V and 0.8 V
is considered as a logical state of 0 (LOW), and a voltage between 2 V and 5 V means 1 (HIGH).
The Digital OUT allows generating a digital signal with up to 16 bits and read it out, for example,
by using a Digital IN / OUT extension Di/o from Multi Channel Systems MCS GmbH. You can utilize
this digital signal to control and synchronize other devices with the MEA2100-System.
Bit 0 to 3 of the Digital OUT are separated and available as Lemo connector DIG OUT 0 to 3
on the front panel of the interface board. So if you need only one, two, three or four bits of
the digital signal, you don’t need the additional Di/o. Please read chapter "Pin Layout"
(Digital IN / OUT Connector) in the Appendix for more information.
The Digital IN can be used to record additional information from external devices as a 16 bit
encoded number. The Digital IN is most often used to trigger recordings with a TTL signal.
The 16 bit digital input channels is a stream of 16 bit values. The state of each bit (0 to 15) can
be controlled separately. Standard TTL signals are accepted as input signals on the digital inputs.
Unused input bits, which have an undefined state, should be masked in the "Trigger Detector"
of MC_Rack.
Warning: A voltage that is higher than +5 Volts or lower than 0 Volts, that is, a negative
voltage, applied to the digital input would destroy the electronics. Make sure that you
apply only TTL pulses (0 to 5 V) to the digital inputs.