V103/113 Vector User Guide Chapter 3 - Operation Page 31 of 35
Alarm Functionality
Note: Alarm functionality is only valid for serial communication.
A relay is located on the Transmit Heading Device (THD) circuit board. The relay contacts are isolated from all
circuitry in the THD. The THD is connected to the coil side of the relay, but not to the contacts that are connected to
the external pins through the main IO connector. If the THD loses power or heading, the coil voltage is lost and the
relay opens and activates the notification method employed by the user. When the heading is output, the relay
contacts remain closed, completing the circuit as an indication that the V103/113 is operational.
Note: Alarm pins must be connected to an IMO-approved device.
Alarm Signal
There are two wires (24 AWG multi-strands) on the output cable that are used for the external alarm function. The
color codes for the two wires are white and white/red stripe and are the output of a relay. When this relay closes,
the connection is complete on the user-defined external notification device.
Watchdog
The watchdog is a timer that is controlled by the software that monitors if the heading is lost. The watchdog
software is compliant with IEC 60495.
Common Commands and Messages
Note: When selecting your baud rate and message types use the following formula and example to calculate the
bits/sec for each message and then sum the results to determine the baud rate for your required data throughput.
The V103/113 has maximum baud rate of 15200.Message output rate * Message length (bytes) * bits in byte =
Bits/second
(1 character = 1 byte, 8 bits = 1 byte, use 10 bits/byte to account for overhead)
Example:
Message
Rate
Bytes
Bits in byte
Bits/sec
GPHDT
10
20
10
2000
GPROT
5
18
10
900
GPHDG
1
33
10
330
GPGGA
1
83
10
830
GPZDA
1
38
10
380
Total
4440
For information on message output rates refer to the Hemisphere GNSS Technical Reference Guide.
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