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Chapter 2: Installation

Serial Ports

The V102 offers position and heading data via two full-duplex (bi-directional)

RS-232 serial ports. In addition to outputting data, these ports are used for

firmware upgrades.

Note: When selecting your baud rate and message types, use the following

calculation to determine your baud rate for your required data throughput.

Messages * Message output rate * Message length (bytes) * bits in byte

Ex: 5 * 20Hz * 40 bytes * 10 = 40,000 bits/sec

For information on message output rates refer to GPS Technical Reference

available from the Hemisphere GPS website at www.hemispheregps.com.

You may configure Port A or Port C of the GPS receiver to output any

combination of data that you want. Port A can have a different configuration

from Port C in terms of data message output, data rates, and the baud rate of

the port. This allows you to configure the ports independently based upon

your needs. For example, if you want one generalized port and one

heading-only port, you can configure the ports as follows:

• Port A to have GPGGA, GPVTG, GPGSV, GPZDA, and GPHDT all

output at 1 Hz over a 9600 baud rate

• Port C to have GPHDT and GPROT output at their maximum rate of

20 Hz over a 19200 baud rate

A personal computer (PC) typically uses a DB9-male connector for RS-232

serial port communications.

Note: For successful communications use the 8-N-1 protocol and set the

baud rate of the V102’s serial ports to match that of the devices to which they

are connected. Flow control is not supported.

When interfacing to other devices, ensure the transmit data output from the

V102 is connected to the data input of the other device. The signal grounds

must also be connected.

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Directed Electronics VS102 Guia do Utilizador Página 29