KVH Industries TracPhone F55, Installation Manual

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Chapter 10: Hardware Interfaces
Discrete I/O interface 61
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10.9 Discrete I/O interface
The BDU also has a discrete I/O interface containing four input/outputs, of the
open collector type. Inputs may be used for F77/GSM operation and outputs
for Tx Off, Radio Silence etc.
The connector outline and pin assignments are described in the figure and
table below.
D is c r e te I/O
Pin number Connection Note
1 GND This group of signals refer
to BDU/ship ground
2 +28 V DC/50 mA Out
3 Common Return This group of signals are
isolated from all other
signals.
Can be used together with
pin 1 and 2 or ship battery
(but not at the same time)
4 Discrete I/O D
5 Discrete I/O C
6 Discrete I/O B
7 Discrete I/O A
1