Research Concepts RC2500 - Manual (Page 93)

86 RC2500 Antenna Controller Appendix E RC2500 Comm Protocol
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byte 5 checksum
The reply to this command will be the same as the reply to the status poll query command except the
command code will be 34h. Note that the NAK reply will be sent back to the host if there are no satellites
available in the RC2500’s memory or if the Pol Control Equipment Code CONFIG mode item is set to 0
(No Pol Control). Note that if the Pol Control Equipment Code is set to 2 (2 Port Feed) there is only one
polarization position associated with the satellite and receipt of this command with either the ‘H’ or ‘V’
argument will result in a move to the single polarization position associated with the satellite. If TRACK
mode is active and a peaking or search operation is in progress this command will not be executed until
after the peaking or search operation terminates. If this occurs the normal acknowledgment will be sent
to the host.
Miscellaneous Command
This command performs miscellaneous functions. Here is the format of the command.
byte 0 STX
byte 1 A where A is the RC2500 address
byte 2 36h the miscellaneous command code
byte 3 'X' the sub-command code
byte 4 'Y' the sub-command parameter
byte 5 ETX
byte 6 checksum
The sub-command code 'X' can have the following values ...
'X' = 'R' This specifies the azimuth or elevation drive reset command.
This accomplishes the same function as the RESET mode of the
RC2500: it allows the user to reset the azimuth, elevation, or
polarization alarms. When the sub-command code is 'R', the
sub-command parameter 'Y' must be either 'A', 'E', or 'P' (for
azimuth, elevation, or polarization respectively) to specify which
axis will be reset. If the 'P' command is specified, the command
will be accepted only if the Pol Control Equipment Code
CONFIG mode item is set to 1 (ONE PORT) or 2 (TWO PORT).
'X' = 'T' This sub-command is used to reset track mode errors (sub-
command parameter 'Y' = R). When the TRACK mode ERROR
sub-mode is active this command will cause the ERROR sub-
mode to terminate. The controller will react as if TRACK mode
was activated via AUTO mode. Note that if a system error is
active (an error message flashing on the bottom row of the
display) the condition which generated the system error must be
rectified or the controller will probably return to the TRACK mode
ERROR sub-mode. This sub-command can also be used to
switch frequency bands when a dual band satellite is being
tracked. A sub-command parameter of 'C' will specify C band
and a sub-command parameter of 'K' will specify K band. The
reply to this command will be a NAK if TRACK mode is not
active, the satellite being tracked was not specified as a dual
band satellite (when the track was initiated via SETUP mode), or
if track polarization movement is not allowed (see byte 32 of the
device status poll command). If polarization movements are not
allowed the controller is either peaking the antenna or
performing a search. Changing the band during a peaking
operation or search can cause the antenna to not accurately
peak the antenna.
The reply to this command will be the same as the reply to the status poll query except the command
code will be '36h'.