Power Requirements; General Purpose I/O Ports - Thrane&Thrane SAILOR TT-3000E mini-C GMDSS System Installation Manual

TT-3000E mini-C GMDSS System
The power connection input is floating (i.e., there is no
galvanic connection from DC+ and DC- to the connector
housing = GND = cable shield).
4.3.7 P
OWER
The TT-3026C mini-C transceiver is designed to operate on
floating DC in the nominal range 12V to 24V, which makes an
AC/DC converter needed, in case the system is to work in an
AC environment. In case an AC/DC converter is used,
please make sure to leave the output of the AC/DC
converter floating, i.e. do NOT connect the negative wire
to ships structure.
The transceiver has an actual working voltage range of 10.5V
to 32V to accommodate power supply variations outside the
nominal range.
Note: In case a 50 meter transceiver cable is used (Opt.
946), the minimum supply voltage measured at the TT-
3616C terminals must be 16VDC.
4.3.8 G
ENERAL
The TT-3026C mini-C Transceiver also contain two
configurable input/output ports available to the user via the
TT-3616C GMDSS Interconnection Box. They are named I/O 5
and I/O6.
When used as outputs, the ports have the following
characteristics:
•
Open collector output.
•
Internal 2.2kOhm pull-up resistor to 3.3VDC.
•
Voltage allowed between GND and the output pin is
0V to 5V.
•
Maximum current into the I/O pin is 25mA.
When used as inputs, the ports have the following
characteristics:
•
Internal 2.2kOhm pull-up resistor to 3.3VDC.
•
To guarantee a logic low input signal, the input
voltage must be < 0.5V.
R
EQUIREMENTS
P I/O P
URPOSE
38/97
Installation Manual
ORTS