We recommend using hardware flow control whenever possible, especially when using higher baud 
rates. 
This command is saved to global non-volatile memory and is not part of a preset. Its value is saved 
each time it is changed. It will retain its value after power-down. Since this command writes to non-
volatile memory, there will be a delay before an acknowledgment is returned. 
Example Description Status Message
S01FLOW1
Set rear panel RS-232 port to use hardware 
flow control. 
S01FLOW1
S01FLOW?
Query flow control setting of rear panel RS-232 
port. 
S01FLOWx , where x is 0, 1, or 2 
depending on the current flow control 
setting. 
8.51. FPLOCK -- Lock/Unlock Front Panel
This command controls the front panel lock feature. When FPLOCK is enabled, the user may not make 
any changes to the system via the front panel. The system settings will still be viewable on the LCD, 
but the user will get an error message if he tries to change them. When FPLOCK is disabled, the user 
has full access to the system settings via the front panel. 
Usage of this command is similar to other boolean commands (see 
Section 6.1) except that when 
disabling this feature, the password must be supplied for the command to work. If an incorrect 
password is supplied, 'ERROR#005' will be generated. The examples below illustrate the correct 
usage. The examples assume that the password has been set to 'aspi' (the default). The front panel 
password can be changed via the 
FPPSWD command. 
This command is saved to global non-volatile memory and is not part of a preset. Its value is saved 
each time it is changed. It will retain its value after power-down. Since this command writes to non-
volatile memory, there will be a delay before an acknowledgment is returned. 
Example Description Status Message
S01FPLOCK1
Lock the front panel to prevent 
users from changing the settings. 
S01FPLOCK1
S01FPLOCK0,yumyum
Attempt to unlock the front panel 
by using an invalid password 
(yumyum). 
S01ERROR#005 -- since an invalid 
password was given, an error message 
was generated. If error messages have 
been disabled (via the 
ERROR command), 
then no status message will be 
generated. 
S01FPLOCK0,aspi
Unlock the front panel by using 
the correct password. 
S01FPLOCK0
S01FPLOCK?
Query the locked status of the 
front panel. 
S01FPLOCKx , where x is 0 or 1 
depending on whether the front panel is 
unlocked or locked, respectively.