BIRD THRULINE 4020 series, Инструкция, Страница: 36 / 74

Bird 4421 RF Power Meter
24
Triggers (Tx)
Function
Select s t h e con dit ion wh ich will t r igger a r ea din g (see F igu r e 19).
Remarks
Failure to trigger device before requesting a reading will lock the bus.
T1 halts the bus until a reading is available.
T0 and T1 do not set the measurement complete SRQ.
T2, T3, T4, and T5 set a SRQ when the measurement is complete.
Fastest reading rate is 2.4 readings/second; slowest is 1 reading/sec.
SRQ Mask (Mxx)
Function
Selectively masks status bits to prevent unwanted service requests.
Set xx to the sum of the binary values of the desired SRQ trigger bits. For
example, M12 would set the SRQ for both operation complete and underrange
Remarks
If a status bit is masked (bit set to 0)
tion.
Figure 19
Trigger Conditions
Command Trigger Condition
T0 Con t in u ou s on t a lk
T1 On e sh ot on t a lk
T2 Con t in u ou s on GE T
T3 On e sh ot on GE T
T4
Con t in u ou s on m ea su r em en t com m a n d
(F C,F D, RC, RD, SW, RL, MN , MX)
T5 On e sh ot on m ea su r em en t com m a n d (F C,
F D, RC, RD, SW, RL, MN , MX)
Figure 20
SRQ Mask Bits
Binary Value Bit Number Message
1 0 (LSB) E r r or (IDDC, IDDCO, self-t est fa il)
2 1
Mea su r em en t over r a n ge
4 2
Mea su r em en t u n der r a n ge
8 3
Oper a t ion com plet e
4
N ot U sed
5
N ot U sed
6
7 (MSB)
N ot U sed