User's Manual

32 SMART-MR10 User Manual Rev 0B
Chapter 3 Operation
Before operating the SMART-MR10 for the first time, please ensure that you have followed the
installation instructions in Chapter 2 Installation and Setup starting on page 21. The following
instructions are based on a COM port configuration such as that shown in Figure 8 on page 36. It is
assumed that a personal computer (PC), or laptop, is used during initial operation and testing for
greater ease and versatility.
3.1 Communications with the Receiver
Communication with the receiver typically consists of issuing commands through the communication
ports from an external serial communications device. This could be either a terminal or PC/laptop that
is directly connected to the receiver serial port using a DB-9 connector on the SMART-MR10 multi-
cable. If you are using a radio, it connects to another DB-9 connector on the same multi-cable by
means of the radio serial cable supplied with the radio. It is recommended that you become thoroughly
familiar with the commands and logs detailed in the OEMV Family Firmware Reference Manual to
ensure maximum utilization of the receivers capabilities.
3.1.1 Serial Port Default Settings
The receiver communicates with your PC/laptop or terminal via an RS-232 serial port. For
communication to occur, both the receiver and the operator interface have to be configured properly.
The receivers COM1, COM2 and AUX default port settings are as follows:
9600 bps, no parity, 8 data bits, 1 stop bit, no handshaking, echo off
Changing the default settings requires using the COM command. See Appendix B.3, COM Configure
COM Port starting on page 75 for details.
COM1 can be configured as RS422. It can also be configured with flow control. COM3 is not
available if COM1 flow control is enabled or if COM1 is configured as RS422. The default
configuration, with the MODE pin unconnected, is that COM1 is RS232 with no flow control.
SMART-MR10 configuration using the Mode pin is summarized in Table 3, Use of MODE
Pin on page 22.
The data transfer rate you choose 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 is
lower and depends on the number of satellites being tracked, data filters in use, and idle time. It is
suggested that you leave yourself a margin when choosing a data rate (115200 is recommended for
most applications).