Norsat 100W ATOM - Manual (Page 12)

ATOM 100W Revision 1.1
908236
12 908236_r1.1 - Operator Manual ATOM KU
100W.doc
Figure 2-1: Connector Pin Out – View of Unit from Outside
Pin D: Shutdown (i.e. Mute Control)
This pin implements the shutdown, or mute function, and the user should apply Ground to this pin to mute
the amplifier. When muted, the 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.
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.
Pins A, B, C, G, H: RS-485 Port
These five pins form a standard RS-485 port, with RX+, RX-, TX+, TX-, and serial port ground.
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. Connect these to
the host computer RS-485 port accordingly.
A B
C
D E F
G
H
J K