Dawn CONTROL-1500A Manual page 88

CONTROL-1500B Single Axis Antenna Controller
The reply to this command will be the same as the reply to the status poll query except the
command code will be '34h'. Note that the NAK reply will be sent back to the host if autopol is
enabled or if 'H' or 'V' is specified and there are no satellites available in the CONTROL-1500 memory.
MISCELLANEOUS COMMAND
This command performs miscellaneous functions. Here is the format of the command.
byte 0:
byte 1:
byte 2:
byte 3:
byte 4:
byte 5:
byte 6:
The sub-command code 'X' can have the following values ...
The reply to this command will be the same as the reply to the status poll query except the
command code will be '36h'.
C PROGRAM
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STX
A where A is the CONTROL-1500 address
36h the miscellaneous command code
'X' the sub-command code
'Y' the sub-command parameter
ETX
checksum
'X' = 'R' This specifies the azimuth or elevation drive reset command. This
accomplishes the same function as the RESET mode of the CONTROL- 1500:
it allows the user to reset the solid state drive circuits if an antenna or
polarization alarm has been detected. When the sub-command code is
'R', the sub-command parameter 'Y' must be either 'A', 'E', or 'P' to
specify which axis will be reset. 'A' and 'E' reset the antenna drive, 'P'
resets the polarization drive. If the 'P' command is specified, the
command will be accepted only if the CONTROL-1500 is configured for use
with the optional polarization control motor.
'X' = 'P' This sub-command allows the host to enable or disable the autopol
mode. If the sub-command is 'P' the sub-command parameter 'Y' must
either be 'N' or 'F' (for autopol oN or ofF, respectively).
'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 that 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 35 of the device status
poll command).
Appendix E Communications Protocol 81