Chapter 3 SMART7 Operation
SMART7 Installation and Operation User Manual v6
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9600 bps
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no parity
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8 data bits
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1 stop bit
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no handshaking
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echo off
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break on
The data transfer rate determines how fast information is transmitted. Take for example a log whose message
byte count is 96. The default port settings allows 10 bits/byte (8 data bits + 1 stop bit + 1 framing bit). It therefore
takes 960 bits per message. To get 10 messages per second then requires 9600 bps. Also remember that even if
you set the bps to 9600, the actual data transfer rate may be lower and depends on the number of satellites being
tracked, data filters in use, and idle time. It is therefore suggested that you leave yourself a margin when choos-
ing a data rate.
The minimum suggested baud rate for most applications is 115200 bps for GNSS only or 230400 bps
for GNSS+INS. If the buffer overrun flag is present in the
RXSTATUS
log (refer to the
mands and Logs Reference Manual
), log at a higher baud rate if possible, or change to a medium sup-
porting higher bandwidth (Ethernet).
Although the receiver can operate at data transfer rates as low as 300 bps, this is not recommended.
For example, if several data logs are active (that is, a significant amount of information needs to be
transmitted every second) but the bit rate is set too low, data overflows the serial port buffers, causing
an error condition in the receiver status that results in lost data.
The following ports are supported and can be configured using the commands listed. Refer to the commands lis-
ted in the
Agriculture Commands and Logs Reference Manual
for detailed instructions.
Receiver Type
Port Supported
Configuration Command
SMART7
COM1, COM2, COM3
SERIALCONFIG
Table 10: Serial Ports Supported
Change the COM Port Settings
To change the settings on a COM port, use the
SERIALCONFIG
command. For example:
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To change the data rate of COM2 to 115200, enter:
SERIALCONFIG COM2 115200
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To change the data rate of COM1 to 57600 and enable even parity, enter:
SERIALCONFIG COM1 57600 E
Communicating using a Remote Terminal
One method of communicating with the receiver is through a remote terminal. To communicate with the terminal,
the receiver requires only the RX, TX and GND lines be used. Ensure the terminal’s communications set up
matches the receiver’s port settings.
