Specifications

Sheet 36 of 39 Document 12245 Rev. I
Example, set PIO output R5 to the Normally Open position and R6 to the Normally Closed position (assuming
neither has previously been assigned to any function with message 17 59), and leaving other outputs
unchanged:
SEND TO UNIT: 02 0F 01 18 53 30 30 30 30 31
32 30 30 EF 03
There is no response. Unused PIO Output R5 is set to “N.O.” position, and R6 is set to “N.C.”
position.
3.10.5 Power Units (18 54)
This message controls whether the Pout (output power) is displayed in dBm, dBW, or Watts. This unit setting
affects values returned by the Get Output Power command (section 3.8.1). The units are sent or returned as
a single enumerated value:
30: dBm
31: dBW
32: Watts
3.10.6 Reflected Measurement Type (18 55)
This message controls whether the reflected power is displayed in Power Units (dBm, dBW, or Watts) or as
Return Loss (in dB), or as VSWR (numeric ratio, relative to 1). This unit setting affects values returned by the
Reflected Measurement command (section 3.8.11).
 When set for POWER, the Reflected Measurement is represented as a power reading, in the same
power units chosen for the Output Power Measurement.
 When set for RETURN LOSS, the Return Loss is computed as the difference between the output power
and the reflected power in dB.
 When set for VSWR, the VSWR is computed from the output power and reflected power measure-
ments. VSWR is a ratio (nn.nn:1), and thus is a unitless number. If the Output Power is too low, the
VSWR is “Undefined”. If the reflected power is greater than or equal to the output power, the VSWR is
reported as “>99.99”.
This setting defaults to POWER, and is stored in non-volatile memory.
3.11 Commands (19)
3.11.1 1:1 Switch Command (19 52)
This command message accepts only one one-byte parameter, which is:
30: Switch this unit on-line
31: Switch the other unit on-line (this one to standby)
41: Switch unit 1 on-line
42: Switch unit 2 on-line
Note that this command offers two different ways of defining which unit is to be switched on-line. The first,
which is compatible with previous SSPA types, allows you to switch the addressed unit (“this” unit) on or off-
line. The second allows you to switch UNIT 1 or 2 on-line. UNIT 1 is identified as the one that connects to
PORT 1 of the waveguide switch, and should have the end of the 1:1 cable labeled "1" plugged into it.
A switch command will not be obeyed if:
(i) the system is in AUTO mode, and
(ii) the command would take a good unit off-line, and connect a faulted unit on-line.
The hardware in the Antenna-Mount 1:1 system allows each amplifier to be able to switch itself on-line only. A
command to an amplifier that switches the other on-line is forwarded over the link to the other amplifier. This
means that if the link is broken, or if the other unit has failed in some way, a command to switch it on-line
cannot be obeyed.