ATOM Ku BUC/SSPA
20W/25W/40W/50W
Revision A
908239
14
908239_rA - Operator Manual ATOM KU 20-
25-40-50W
Pin D is also configurable to be either active high or active low. When configured as active high, any
voltage between 3.0 V and 5.0 V (relative to case ground) will mute the output. When configured as
active low, any voltage between 0.0 V and 0.8 V (relative to case ground) will mute the output.
The case ground may be connected at any location on the outer metal shell of the unit.
P
IN
G:
GND
Ground is connected to the amplifier housing. This pin is electrically connected to the outer aluminum
shell and thus to the mounting screws used to hold down the unit. This is for small signal only; any high-
current connections should use the external screws on the outside of the aluminum case.
P
IN
A,
B,
C,
J:
RS-485
These four pins form a standard RS-485 port, with RX+, RX-, TX+, TX-. Use Pin G as the ground
reference for this port.
TX+ and TX- are the differential pair which carries a signal from the host computer to the unit. RX+ and
RX- are the differential pair which carries a signal from the unit to the host computer. Ensure these are
connected to the host computer RS-485 port accordingly.
•
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)
•
J
RX- (RS-485)
Host computer RX- signal (signal out of unit)
P
IN
E,
F:
RS-232
Pins E and F form a standard RS-232 port, with RX and TX. Use Pin G as the ground reference for this
port. Ensure these are connected to the host computer RS-232 port accordingly.
•
E
RX (RS-232)
Host computer RX signals (signal out of unit)
•
F
TX (RS-232)
Host computer TX signals (signal into unit)
