RS-232 Interface
28
Xmission Flow Control (XO/XF)
Device Dependent Commands
The device-dependent commands used by the 4421 Power Meter are listed in
Table 16
, organized by category.
Table 16 RS-232 Device Dependent Command Summary
Function
Enables or disables the XON/XOFF flow control.
XO enables flow control.
XF disables flow control.
Remarks
When data is being sent from the power meter to the computer and flow control is
enabled, data transmission will be suspended when the XOFF character (hexadecimal
13) is sent by the computer. Transmission will resume when XON (hex 11) is sent by the
computer.
When data is being sent from the computer to the power meter, XOFF will be sent to
the c
omputer when the input buffer fills up. XON will be sent to the computer when the
buffer has emptied.
Category Command Description
Measurement
FC Forward carrier wave
FD Forward dBm
RC Reflected carrier wave
RD Reflected dBm
SW Standing wave ratio
RL Return loss
MN Minimum value
MX Maximum value
Range
RYY Auto range on
R00 to R17 Manual ranges
RNN Auto range off, stay at present range
Terminators
YT Two terminators: CR, LF
YO One terminator: CR
YN No terminator
Prefixes
PY Prefix YES
PN Prefix NO
Triggers
T0 Continuous on ENT
T1 One shot on ENT
T3 One shot on TRG
T5 One shot on measurement command
Status
U0 Send back current machine state
U1 Send back error conditions
U2 Send back revision levels
Self-Test
J0 Run self-test
Writable Store
WXXXXXX Place XXXXXX in RAM
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