Operating instructions

SEA M300USERSGUIDE
GENERALINFORMATION  38
Note: IDnumbersarenumbersgiventoeachuseraccountorgroupaccountforidentificationandshouldbe
assig ned anIDnumbergreaterthan100.IDnumbersbelow100areoftenusedbysy s t emprocessesand
shouldbeavoided.Also,Thehomedirectory,initialcommand,andinitialpassworditemsareoptional.Ifyou
don'tspecifythem,thedefaultvaluesareused.Forpassword,thedefaultisnopassword.
2. If you wish to change the default profile settings QNX uses, the easiest way to do this is to copy
another users profile settings to the new account by performing the following copies (note that
some files may not exist).
cp -pR /home/augie /home/username
DELETINGUSERACCOUNTS
To delete an account, you must log in as the superuser and remove the following.
1. The user database entry from the ‘/etc/passwd’ file.
2. The username from the corresponding group Id membership entry in the ‘/etc/group’ file.
3. The corresponding encoded login password entry from ‘/etc/shadow’ file.
4. The user's home directory (optional).
ADDSEAGROUP
Edit the /etc/group file and make sure it looks like the following.
root::0:root
mail::40:
sea::101:
RECOMMENDATIONSFORAREAL‐TIMEDATAACQUISITIONSYSTEM
Below are some points of careful consideration whenever running a computer system with real-time
data acquisition requirements.
• There are certain applications that may interfere with the real-time performance of the M300 data
acquisition system. You must avoid running these applications when the M300 system is running in
acquisition mode.
• As a general rule, the user should not be running any other applications unless it absolutely necessary while
the M300 is running in acquisition mode.
• Do not run the ‘Dosfsys’ or ‘Fatfsys’ applications while the M300 is running in acquisition mode.
• Do not enable or run the screen saver while the M300 is running in acquisition mode.
• IRQ, DMA and Address conflicts will prevent the M300 from operating properly. The problems caused by
IRQ, DMA and Address conflicts can be at the board level or at the system level depending on the
particular situation.