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ARMA-C125-CRM
30
6.4
D
ISCRETE
I
NTERFACE
The discrete interface provides all the necessary functions to monitor and control the amplifier.
The unit provides open collectors for continuous monitoring alarms, faults, amplifier status and
amplifier enable/disable switching.
Figure 8
at page 30 provides the detailed circuit information
required to use the above features. Pins 12, 13,16, 17, 18 & 19 are active for redundant option
only.
6.4.1
RF E
NABLE
In order to disable the MUTE state of the amplifier and to enable the RF output, a contact
between pins 8 & 15 of the Discrete Interface connector (J3) is mandatory. When these pins are
not in contact, the amplifier is in MUTE state.
Figure 8:
Discrete Interface - Proposed Monitor and Control circuit
15
8
9
12
10
11
13
7
19
18
17
6
5
4
3
2
FROM J3
DISIN_C
TO J3-12
OF 2-nd SSPA
TO J3-15
OF 2-nd SSPA
16
PWRON_S
RFMUT_S
ALARM_S
FAULT_S
RFOUT_S
REMOT_S
SWTU1_S
SWTU2_S
SWTUS_R
STDBY_S
DISOU_C
SWTWG_A
GAIDW_A
GAIUP_A
AUTOS_A
CIFRC_A
RFENA_C
GND
INTERFACE ON
GRN
YEL
GRN
YEL
RED
+12V
GRN
GRN
YEL
1
GRN
ALL RESISTORS
ARE 4.7 k