Research Concepts RC2500 - Manual (Page 59)

52 RC2500 Antenna Controller Chapter 5 Modes
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POSITION COUNTS
Several of the CONFIG mode items described in this chapter reference position counts. The
RC2500 uses 16 bit resolver to digital converters for measuring antenna position. The output of
the converter is a numeric value in the range of 0 to 65535. These numeric values are referred to
as position counts. Each position count corresponds to an angular value of 360.00 / 65536 or
0.005493 degrees.
The AZIM SLOW SPEED CODE and ELEV SLOW SPEED CODE CONFIG mode items are only visible
on the firmware version written for the Harris 9135 retrofit controller. The speed codes are integers
between 1 and 255. 255 being the fastest speed and 1 being slowest. Actual antenna slew rate in
degrees / Second depends on the setting of the drive modules in the A.I.U.
AZIM SLOW SPEED CODE:176 CONFIG
1 –255 ENT,BKSP,SCRLL ^v
During an automatic move, when the antenna position is within AZ/EL FAST/SLOW THRESHOLD
position counts of the target position, the antenna speed will switch from fast to slow.
AZ/EL FAST SLOW THRESHOLD: 400 CONFIG
0-1000 COUNTS ENT,BKSP,SCRLL ^v
The AZ/EL AUTO RETRY ATTEMPTS CONFIG mode item sets the maximum number of attempts which
will be made to hit a target position (within MAX POSITION ERROR COUNTS - described below) during
an automatic move initiated from AUTO or TRACK modes.
AZ/EL AUTO RETRY ATTEMPTS:3 CONFIG
2-5 ENT,BKSP,SCRLL ^v
The 'FAST DEADBAND and 'SLOW DEADBAND CONFIG mode items are used for the anti-reversal
system. The anti-reversal system keeps the antenna from rapidly changing direction. If the antenna has
been moving in a given direction, the Deadband CONFIG mode items specify the amount of time that the
system will wait before asserting the antenna drive lines to move the antenna in the opposite direction.
There are 2 different Deadband values specified - there are unique fast and slow speed values. If the
antenna has been moving fast, the Fast Deadband parameters specify the wait interval; if the antenna
has been moving slow, the Slow Deadband parameters specify the wait interval. Both Deadband values
are given in milliseconds.
AZ/EL FAST DEADBAND:2000 CONFIG
175-5000 MSEC ENT,BKSP,SCRLL ^v
AZ/EL SLOW DEADBAND: 800 CONFIG
175-5000 MSEC ENT,BKSP,SCRLL ^v
During an automatic move in AUTO or TRACK modes, the 'COAST THRESHOLD CONFIG mode items
set the number of counts before the target position is reached where the drive will be deactivated. The
idea is to deactivate the drive and let the antenna coast into position. If, prior to the initiation of the move
operation, the total number of counts that the actuator has to move to reach the target position is less
than the COAST THRESHOLD, the drive will be deactivated when its position is within MAX POSITION
ERROR counts of the target position.
AZIM COAST THRESHOLD: 40 CONFIG
1-500 COUNTS ENT,BKSP,SCRLL ^v
ELEV COAST THRESHOLD: 40 CONFIG
1-500 COUNTS ENT,BKSP,SCRLL ^v