SeaSpace TeraScan 1.5M, Operation And Maintenance Manual

Page: 193 / 232

TeraScan 1.5m Polar Satellite Tracking Antenna O & M Manual
177
ixxxx
↵
Cross-level differential position command. Command format is ASCII HEX. Angular
range is 0000 - FFFF. 4000=nominal position of 90 degrees. The command computes the
difference between current command and the last valid differential or absolute command
and adds this difference to the present target position. Since tracking modifies the target
position, this differential method provides a method for keeping the tracking information
cumulative while forward-correcting the position information to keep the pointing errors
to a minimum. The numeric format of this command allow 1/182 degree differential
position resolution. PCU response: CR, LR,">" when command is accepted.
Jaaaa
↵
Move azimuth to ship-relative position. Azimuth stabilization, Unwrap, and tracking
mode remain active after a J command. PCU response: CR, LF,">" when command is
accepted.
jxxxx
↵
Level (Elevation) differential position command. Functions just like the Ixxx command
above but in the Elevation axis.
kxxxx
↵
Azimuth differential position command. Functions just like the ixxxx command above but
in the Azimuth axis. PCU response: CR, LF, ">" when command is accepted.
labcd
↵
Lumped "i", "j", "k" command. Allows up to 9-bit resolution of the differential i, j, and k
commands to be sent as one command with an automatic position report from the PCU to
reduce the communications channel overhead. The lower bits of the individual i, j, and k
commands are packed into ASCII characters as follows:
a = Cl lsb & 11000000 /4 + LV lsb & 11000000 /16 + AZ lsb & 11000000 /64 + "@"
b = CL lsb & 00 "@"
c = LV lsb & 00 "@"
d = AZ lsb & 00 "@""@" = 01000000
nXmmm
↵
Get/set Remote PCU parameters to NXmmm. Used to get/set pedestal system type,
adjust individual axis gains and set reference offsets. PCU response: Xmmm, CR, LR, ">"
when command is accepted. X=0 to 6, mmm = 999 to get data. See Section 8.5.10, page 153.
O00nn
↵
Output data to EME equipment. Changes logic state of output lines DO0-DO5. Data is sent
as four ASCII octal digits. The first two digits are zero. D05, D04, D03 are the third digit.
DO2, DO1, DO0 are the fourth digit. DO0, DO1, and DO2 are reserved for the
downconverter.
Allowable range of nn is 0000 to 0077.
PCU response: CR, LR,">" when command is accepted.
Note: "o" command exists to read back the last output value.
^ xxxx = Remote Setting Changes