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1st3001001 EN 1_14.docx
1
st
-Relief GmbH
Bank: UniCredit Bank Austria AG
FN: 206478w, HG Wien
Handelskai 388 / Top 632
Swift/BIC: BKAUATWW
VAT No.: ATU 51115305
1020 Vienna, Austria, Europe
IBAN: AT24 1100 0085 7396 5400
Tax No. 014/3645
www.1st-Relief.com
EORI: ATEOS1000001609
CABLE 4:
Depending on the Voltage used for the Nauticast B2 you have to calculate the series resistor
which is connected with the LED between the + wire (grey) and the OUTPUT wire (CH1 LED
RED, green; CH2 LED RED, brown; TX TIMEOUT LED, white; ERROR LED, yellow). A series
resistor of 330
(calculated 350
) for 12VDC and 910
or 1k
(calculated 950
) for 24VDC
are needed - see calculation below.
How to connect a LED to XXX LED OUT
Calculation of the series resistor:
Used variables:
U... operating voltage of the Nauticast B2
U
F
... Forward Voltage of LED [V]
I
F
... Forward Current of LED[V]
R... Series Resistor[Ω]
P... Power consumption of the resistor[W]
𝑅 =
𝑈−𝑈
𝐹
𝐼
𝐹
Examples:
U=12V, U
F
=2V, I
F
=20mA:
𝑅 =
12𝑉 − 2𝑉
0.02𝐴
=
10𝑉
0.02𝐴
= 500𝛺
As there is already a 150
resistor included for the LED OUT ports, you have to substract
this from the 500
. Therefore 350
is the result.
(!) The ALARM OUT has no resistor included therefore 500
is the result. (see CABLE 3)
U=24V, U
F
=2V, I
F
=20mA:
𝑅 =
24𝑉 − 2𝑉
0.02𝐴
=
22𝑉
0.02𝐴
= 1100𝛺
As there is already a 150
resistor included for the LED OUT ports, you have to substract
this from the 1100
. Therefore 950
is the result.
(!) The ALARM OUT has no resistor included therefore 1100
is the result. (see CABLE 3)
XXX LED
R
+
