V103/113 Vector User Guide Chapter 2-Installation Page 17 of 35
Selecting Baud Rates and Message Types
When selecting your baud rate and message types use the following formula to calculate the bits/sec for each
message and then sum the results to determine the baud rate for your required data throughput.
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)
See “Common Commands and Messages” for an example of this calculation. For information on message
output rates refer to the Hemisphere GNSS Technical Reference Guide.
Recommendations for Connecting to Other Devices
When interfacing to other devices, ensure the transmit data output from the V103/113 is connected to the data
input of the other device. The signal grounds must also be connected.
Since RS-422 is a balanced signal with positive and negative signals referenced to ground, ensure you
maintain the correct polarity. For example, when connecting the transmit data output positive signal to the
receive line of the other device, it should be connected to the receive positive terminal. The negative transmit
data signal from the V103/113 is then connected to the receive data negative input of the other device.
There is likely little reason to connect the receive data input of the V103/113 to another device unless it is able
to send configuration commands to the V103/113. Since the V103/113 uses proprietary NMEA 0183
commands for control over its configuration, the vast majority of electronics will not be able to configure its
settings unless the other device has a terminal setting where you can manually issue commands.
NMEA 2000 Port
To use V103/113 for NMEA 2000 you have to connect the included serial-to-NMEA 2000 adapter (P/N 710-
0113-000#, see Figure 2-9) to the unit. Insert the 18-pin connector of the adapter into the male end of the 18-
pin connector on the V103/ 113 by aligning the keys. You can then attach the adapter to the unit using the
supplied screws (machine, 8-32, ½”, PPHC, SS) and washer (flat, #8, SS). The 5-pin male Micro-C connector
connects to your NMEA 2000 dropcable.
Figure 2-9: Serial-to-NMEA Adapter
Note: The serial-to-NMEA 2000 adapter is not an IMO requirement and may not be used in such an
application.
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