Research Concepts RC2500 - Manual (Page 86)

RC2500 Antenna Controller Appendix E RC2500 Comm Protocol 79
Research Concepts, Inc. • 5420 Martindale Road • Shawnee, Kansas 66218-9680 • USA www.researchconcepts.com
byte 31 azimuth, elevation, and polarization limits, binary data
7 6 5 4 3 2 1 0
0 1 A B $ C D E F
A ‘0’ in a bit position implies that the antenna is not at the limit, a
‘1’ in the bit position implies that the antenna is at the limit. Here
is the mapping of bit positions to the limits ....
A - Azimuth Clockwise
B - Azimuth Counterclockwise
C - Elevation Up
D - Elevation Down
E - Polarization Clockwise
F - Polarization Counterclockwise
If the controller is designed to interface to an outdoor unit which
just reports a summary limit indication (such as the Vertex 7134),
bit position F will report the status of the summary limit.
byte 32 polarization equipment and display status code - binary data
7 6 5 4 3 2 1 0
0 1 X X $ Y Z Z Z
where ‘XX’ is ...
00 if a rotating feed is not present in the system
01 if a single port rotating feed is present in the system
10 if a dual port rotating feed is present in the system. A dual
port rotating feed can simultaneously receive both horizontally
and vertically polarized signals.
where ‘Y’ is ...
0 if polarization movements are not allowed.
1 if polarization movements are allowed.
Discussion - The ‘Y’ field described above only contains
meaningful data when TRACK mode is active. Polarization
movement is not allowed during a TRACK mode peaking
operation. If a polarization operation occurs while peaking the
antenna the peak obtained may not be reliable. If a ‘go to’ H or
V polarization command is received via the serial port the
controller will execute the command after the peaking operation
is completed. The reply to the ‘go to’ command will be an ACK.
A polarization jog command which is received during a peaking
operation will not be registered and executed later. The reply to
the command will be a NAK.
where ‘ZZZ’ is ...
000 if the ‘H' polarization code is displayed
001 if the 'h' polarization code is displayed
010 if the 'V' polarization code is displayed
011 if the 'v' polarization code is displayed
100 if no polarization code is displayed
byte 33 azimuth movement/alarm status - binary data