EndRun RTM3204, Руководство пользователя

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R T M 3 2 0 4 G P S T i m i n g M o d u l e U s e r M a n u a l 6
C H A P T E R T W O
7 R T M 3 2 0 4 G P S T i m i n g M o d u l e U s e r M a n u a l
B A S I C I N S T A L L A T I O N
parameters were set up correctly. Otherwise, it is recommended that you read the following sections
on use of the RS-232 serial I/O port now, since they will help you in debugging any problems that
you may encounter with the automatic configuration via DHCP.
If your network
does not
use DHCP, you will need to configure your ethernet interface using the RS-
232 serial I/O port. The following sections contain brief descriptions on how to do that.
Configuring Ethernet with the Serial Port
To configure your ethernet interface with the serial port, after logging in as the root user, you must
run a simple shell script called
netconfig
from the
bash
shell prompt. This shell script will prompt
you for the needed information and perform some syntax checking on your inputs. Then it will create
or modify the appropriate files needed to configure the ethernet interface. The following sections will
guide you in setting up communications with the RTM3204 using its RS-232 serial I/O port.
Connect the RS-232 Serial I/O Port
You will need to use the RS-232 serial I/O port if your network does not support the Dynamic Host
Configuration Protocol (DHCP). In that case, you must be able to configure the RTM3204 network
parameters manually using the Linux console shell interface which is provided by this serial I/O port.
Under certain conditions, you may also need to use the RS-232 serial I/O port if you encounter a
problem while upgrading the firmware in your RTM3204 GPS Timing Module.
To test serial communications with the RTM3204 you will need either a VT100 compatible terminal
or a terminal emulation program running on your computer. We will refer to either of these as “termi-
nal” for the remainder of this instruction.
1. Disconnect power from the RTM3204.
2. Connect one end of the DB9F-to-DB9F null modem adapter cable to the serial I/O jack on the
RTM3204.
3. Connect the other end of the DB9F-to-DB9F null-modem adapter cable to the terminal. If the
serial I/O port on your terminal does not have a DB9M connector, you may need to use an adapter.
Refer to
Chapter 3 - RS-232 Serial I/O Port Signal Definitions
for details on the signal wiring.
If
you are using a computer for your terminal, remember which port you are using because you will
need to know that in order to set up your terminal software.
Test the Serial Port
You must configure your terminal to use the serial I/O port you used in
Connect the RS-232 Serial
I/O Port . You must also configure your terminal to use the correct baud rate, number of data bits,
parity type and number of stop bits.
Be sure to turn off any hardware or software handshaking.
The
settings for the RTM3204 are:
• 19200 is the Baud Rate
• 8 is the number of Data Bits
• None is the Parity
• 1 is the number of Stop Bits
After configuring these parameters in your terminal, apply power to the RTM3204. (The RTM3204
is a derivative of our Tycho GPS Frequency Reference. As such, all the Linux scripts will contain