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Pin-outs
Functional Ground
is a ground connection for the reduction of electrical noise. It is different from a
Protective Earth which is for safety purposes, and is not required on these products due to their low operating
voltage. The Functional Ground (earth) on the ED-5xx product series is on pin 5 of the black power connector.
There is also a contact clip on the back of the product case which connects the Functional Ground to the DIN
rail the product is mounted on. DIN rails are typically grounded, in which case it is not necessary to wire to the
Functional Ground terminal as well.
Power Ground
(GND, -V) is the low side or "0V" of the power input. The terminals labelled GND on the pin-
out tables are connected directly to the –V terminals of the BLACK power input connector and are thus
connected to the low side of the power supply/supplies.
Analogue Ground
(AGND) is the ground for the analogue input or output circuitry. It is isolated from
power ground to reduce noise and prevent ground loops, but can be connected to power ground if the system
design requires it. For the ED-560, AGND is the reference voltage for the single-ended voltage outputs and the
loop 0V terminal for current-mode outputs. For the ED-549, the analogue measurements are not directly
dependent on the AGND connection (voltage mode measures the voltage between the AIn+ and the AIn-
terminals, and current mode measures the current flowing through the AIn+ and AIn- terminals) – but AGND is
still required to be connected to a suitable 0V point on the signal-sourcing equipment, such that all the AIn+
and AIn- terminals are within ±11V of AGND. AGND is also a suitable connection point for any cable shield or
drain wires.
ED-549 Pin-outs
Terminal Block
Yellow
Orange
Grey
Green
Blue
Black
ED-560 Pin-outs
Terminal Block
Yellow
Grey
Green
Black
Ethernet Analogue DIO
Product Manual V1.3
Pin 1
Pin 2
AGND
AIn 0-
AGND
AIn 2-
GND
RS-485 D-
AGND
AIn 4-
AGND
AIn 6-
-V
+VA
Pin 1
Pin 2
AGND
VOut 0
GND
RS-485 D-
AGND
VOut 2
-V
+VA
© Copyright Brainboxes Ltd
Pin 3
Pin 4
AIn 0+
AIn 1-
AIn 2+
AIn 3-
RS-485 D+
RS-485 D+
AIn 4+
AIn 5-
AIn 6+
AIn 7-
+VB
-V
Pin 3
Pin 4
VOut 1
IOut 0
RS-485 D+
RS-485 D+
VOut 3
IOut 2
+VB
-V
Pin 5
AIn 1+
AIn 3+
RS-485 D-
AIn 5+
AIn 7+
Func GND
Pin 5
IOut 1
RS-485 D-
IOut 3
Func GND
Page 14 of 100
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