ATOM Ku BUC/SSPA
20W/25W/40W/50W
Revision A
908239
13
908239_rA - Operator Manual ATOM KU 20-
25-40-50W
The pin outs are given in Table 2-1 and shown in
Table 2-1: J2 Pin Outs
Connector Pin
Function
Description
A
TX- (RS-485)
Host computer TX- signal (signal into unit)
B
TX+ (RS-485)
Host computer TX+ signal (signal into unit)
C
RX+ (RS-485)
Host computer RX+ signal (signal out of unit)
D
SHUTDOWN
Controls Muting of Amplifier
E
RX (RS-232)
Host computer RX signals (signal out of unit)
F
TX (RS-232)
Host computer TX signals (signal into unit)
G
GND
Case Ground – Do not exceed 100mA
H
Reserved
Leave unconnected / open circuited
J
RX- (RS-485)
Host computer RX- signal (signal out of unit)
K
Reserved
Leave unconnected / open circuited
Figure 2-1: J2 Connector Pin Out, Viewed Looking at SSPA/BUC from the Outside
P
IN
D:
S
HUTDOWN
(
I
.
E
.
M
UTE
C
ONTROL
)
This pin implements the shutdown, or mute function, and the user should apply Ground to this pin to mute
the amplifier. When muted, the unit power transistors are turned off, reducing power consumption and
giving an RF output noise close to the thermal noise floor.
Pin D has an internal 50K-ohm resistor that can be configured as a pull-up to 4V, or as a pull down to
ground. Because of the configurable pull-up / pull-down resistor, the unit can be configured to be active
(i.e. not muted) when Pin D is left open circuited, therefore, no connection is necessary on pin D for the
amplifier to operate normally.
A
B
C
D
E
F
G
H
J
K
