Connections and Controls
Power input port
Connect the EcHo Plus to the supplied AC power adaptor using
the supplied 2 pole screw block terminal. White/black wire con-
nects to 12V, black wire connects to GND.
The EcHo Plus adaptor incorporates a universal mains input
which accepts AC line input from 100 V to 240 V.
I/O ports
EcHo Plus has three I/O (Inputs/Outputs) available that can be
configured as either output or input. They can be used for a PIR
(movement) sensor, keyboard lock, relays or other compatible
uses. The ports are not potential free; you may need external
relays to prevent ground loops depending on your application.
When used as outputs, the I/O ports are active low. When acti-
vated, the I/O ports are tied to GND through a FET transistor
(also called open drain/collector function). Each I/O can draw up
to 24VDC/500mA.
When used as inputs, the applied voltage must be below 1 VDC
to be accepted as LOW, and above 4 VDC (but below 24 VDC)
to be accepted as HIGH. The inputs are default HIGH and must
be connected to ground in order to change state.
RS-232 port
The RS-232 port (TX-1, RX-1) is used for one- or two-way
communication. A two way port is used for devices on which
you want to use reply (e.g. your projector).
To connect the EcHo Plus you must wire the RS-232 cable as
shown here. This is a female 9 pin SUB-D connector that will fit
into a standard computer RS-232 port, or any USB to RS-232
converter.
Neets Control
EcHo Plus, DK
P/N: 310-0252
LAN
GND
GND
I/O 1
I/O 2
I/O 3
PWR
NDA
NCL
GND
GND
TX-1
TX-2
RX-1
GND
12V
Neets Control
EcHo Plus, DK
P/N: 310-0252
LAN
GND
GND
I/O 1
I/O 2
I/O 3
PWR
NDA
NCL
GND
GND
TX-1
TX-2
RX-1
GND
12V
Neets Control
EcHo Plus, DK
P/N: 310-0252
LAN
GND
GND
I/O 1
I/O 2
I/O 3
PWR
NDA
NCL
GND
GND
TX-1
TX-2
RX-1
GND
12V
PIN 5 <-> GND
PIN 3 <-> Rx
PIN 2 <-> Tx
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