Bird Technologies 4421 - Manual (Page 41)

RS-232 Interface
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Device Dependent Commands
The device-dependent commands used by the 4421 Power Meter are listed in
Table 6-16, organized by category.
Table 6-16 RS-232 Device Dependent Command Summary
Forward Carrier Wave (FC)
Forward dBm (FD)
Reflected Carrier Wave (RC)
Reflected dBm (RD)
Function Selects forward or reflected RF power measurement mode.
Remarks Measurement results are returned in Watts or dBm.
Standing Wave Ratio (SW)
Return Loss (RL)
Function Selects SWR or return loss match measurement mode.
Remarks Measurement results are returned in VSWR or dB.
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