Making Changes To The Serial Port Settings (If Needed); Determining The Serial Port Settings - Symmetricom 58502A User Manual

CAUTION
NOTE
Chapter 3 Features and Functions
Serial Interface Ports

Making Changes to the Serial Port Settings (If Needed)

If you change the serial port settings, your changes will be
stored in the 58502A. Cycling power will not reset to factory
defaults. Therefore, if you make a change, it is recommended
that you record the settings and keep the record with the
58502A.
If you need to change the serial port settings, for example, to set
up for a different computer, use the guidelines given in this
section.
Serial port settings are changed by issuing commands.
It is recommended that you issue a single compound command which
simultaneously sets all the serial port parameters. Then connect the
other computer and begin using the instrument with the new settings.
If you choose to set parameters one at a time, you will make the
procedure more difficult. That is, with each change, the instrument
will be updated, but your computer will retain its original settings.
At each step, you will have stopped serial communications and be
forced to modify your PC settings to match the 58502A in order to
continue. It is recommended that you make all changes in a single
compound command, verify the changes, and record all parameters.
The command line below would set the RS-232C port pacing to XON,
baud rate to 2400, and parity to EVEN.
SYST:COMM:SER:PACE XON; BAUD 2400; PARITY EVEN

Determining the Serial Port Settings

If you connect your PC, press Return, and do not get a scpi> prompt
back from the 58502A, your 58502A's serial communication settings
may have been modified. You need to systematically step through the
data communication settings on your PC until your PC matches the
58502A. The 58502A cannot communicate its settings until this
process is complete.
Iterate until you are able to verify that settings on your PC match the
58502A.
When you are successful, you will have restored full RS-232
communications, enabling you to query the 58502A's communication
settings. Once you establish communications with the serial port, you
can query the 58502A for settings of the port.
3-8 User's Guide