Thruline RF Power Meter, Model 4421
31
P
refixes
(Px)
Table 18
Prefix
Examples
T
riggers
(Tx)
Table 19
Trigger
Conditions
Function
Turns the prefix mode on or off. Set x to:
“Y” to enable prefixes.
“N” to disable prefixes.
Remarks
Prefixes are sent over the bus with the measurement, and indicate the status of the
current measurement (see
Table
18
for examples):
“FC”,”FD”,”RC”,”RD”,”SW”,”RL”,”MN”,”MX” indicates the measurement type.
“U” indicates underflow; the value sent is “.000”.
“O” indicates overflow; the value sent is “199.9”.
“N” indicates normal; the value sent is a normal on-scale reading.
“4421” indicates the Bird model number.
Data String
Description
NFC.0.123W(CR)(LF)
Normal (N) forward carrier wave (FC), prefixes on
OFC 199.9W(CR)(LF)
Overflowed (O) forward carrier wave (FC), prefixes on
199.9W(CR)(LF)
Overflowed forward carrier wave, prefixes off
URD
.000W(CR)(LF)
Underflowed (U) reflected dBm (RD), prefixes on
Function
Selects the condition which will trigger a reading (see
Table
19
).
Remarks
Failure to trigger device before requesting a reading will lock the bus.
Fastest reading rate is 2.4 readings/second; slowest is 1 reading/sec.
Command
Trigger Condition
T0
Continuous on ENT
T1
One shot on ENT
T3
One shot on TRG
T5
One shot on measurement command (FC, FD,
RC, RD, SW, RL, MN, MX)
