NOVATECH INSTRUMENTS 5 409C Manual Rev 1.12
Serial Command Function
Fn xxx.xxxxxxx
Set Frequency of output ‘n’ in MHz to nearest 0.1Hz. n=0, 1, 2 or 3. Decimal point not re-
quired. 0.00 sets a channel to DC. Maximum setting: 171.1276031 MHz. Single tone mode.
Fd xxx.xxxxxx
Stores the External Direct Input frequency in MHz. Used with the ‘C d’ command. Valid entries are
1.000000 to 500.000000.
Fr xxx.xxxxxx
Stores the External Reference Input frequency in MHz. Used with ‘C e’ command. Valid entries are
10.000000 to 125.000000.
Pn xxx.xx
Set Relative Phase of output ‘n’ in degrees. n=0,1,2 or 3. xxx.xx = 0.00 to 359.99. Single
tone mode.
Vn x.xxx
Set the Amplitude of output channel ‘n’. n=0,1,2 or 3. The amplitude indicates the signal
level in Vpp when driving a 50 ohm load. Maximum amplitude setting is x = 1.000 (the de-
fault) . If the amplitude scale factor is not 1, the Vn command specifies the output amplitude
before the amplitude scale factor is applied. Does not work when sweep is enabled.
Vs n
Set the output Amplitude Scale Factor. n=1 for full scale, n=2 for one half scale, n=4 for one
quarter scale and n=8 for one eighth scale. All channels are scaled equally
E x
Serial Echo control. x=d for Echo Disable, x=e for Echo Enable
R
Reset. This command resets the 409C to the same state as after power-up or cycling power,
except the baud rate remains unchanged (cycling power will reset the baud rate to
115.2KBaud).
CLR
Clear. This command resets all factory default values except for the values stored in table
memory. Use the TCLEAR command to reset the table to an empty state.
S
Save. Saves Frequency, Amplitude, Amplitude Scale Factor, Phase, Phase Reset Mode, Up-
date Mode, Active Table Range, Table Dwell Scaling and Echo settings to flash memory.
Does not save the Table Rows. Use TSAVE to save Table Rows. Saved values will be re-
called after power up or reset. Use the ‘CLR’ command to return to factory default values.
Q
Returns the current values of the non-volatile settings and the firmware version.
M x
Phase Mode. x=n means the phase will not be reset with every update. This is the default
mode. x=A means the phase will be reset on every update. x=S will force a manual update
on all phases.
I x
I/O Update (IOUD). If x=a, then an IOUD update pulse is automatically sent at the end of
each serial command. This is the default. Sending ‘I x’ with x=m, puts IOUD into manual
mode and an update pulse must be sent manually. This manual IOUD update pulse happens
by sending the ‘I x’ command with x=p. If x= e, then the IOUD is changed from an output to
an input requiring an external logic pulse to cause an update. If x=s, then external TS inputs
are enabled. If x=d the external TS inputs are disabled (the default condition).
B aa[bb[cc[dd[ee[ff
[gg]]]]]]
This Byte command allows each register in the DDS chip to be set. Different registers re-
quirea various number of bytes to be written depending upon the function. Please consult
Analog Devices AD9959 data sheet for details. Note that it is possible to set the DDS chip
into a non-functional mode, requiring a power cycle to recover. All values are in hexadecimal
and no error checking , other than correct format, is performed.
C x
Set Clock Source. Set x= i for internal clock (the default). Set x=e for external reference.
Set x=d for direct input. See Table 5 for details on these settings.
Table 2: Serial Commands (Not Case Sensive)
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