RESEARCH CONCEPTS RC2000A DUAL AXIS Instructions Manual page 82

82 RC2000A Dual Axis Antenna Controller
byte 4:
byte 5:
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 RC2000 memory.
QUERY NAME COMMAND
This query command instructs the RC2000 to send back to the host computer an indexed satellite name
from the list of satellites stored in non-volatile memory. This list is comprised of those satellites that
were saved via SETUP mode in the RC2000. A maximum of 50 can be in the list. This query command
contains 7 bytes and the format is;
byte 0:
byte 1:
byte 2:
bytes 3,4:
byte 5:
byte 6:
The normal response to this query command contains 19 bytes and the format is as follows;
byte 0:
byte 1:
byte 2:
bytes 3,4:
bytes 5,6:
bytes 7-16:
byte 17:
byte 18:
Note that if entry 'XX' does not exist in the list (or the list has no entries) the NAK reply will be sent back
to the host.
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 ...
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ETX
checksum
STX
A where A is the RC2000 address
35h the query name command code
'XX' where XX is the index of the satellite name being requested.
Normally this would be '01' the first time through and then
incremented until the 'YY' (YY being the last entry in the list)
satellite name is read. The maximum possible range for XX
and YY is 1 through 50.
ETX
checksum
ACK
A where A is the RC2000 address
35h the query name command code
'XX' where XX is the index of the satellite name being requested.
'YY' where YY is the total number of satellite names contained in
the list.
This field will contain the satellite name.
ETX
checksum
STX
A where A is the RC2000 address
36h the miscellaneous command code
'X' the sub-command code
'Y' the sub-command parameter
ETX
checksum
'X' = 'R' This code specifies the azimuth, elevation, or polarization drive
reset command. This accomplishes the same function as the
RESET mode of the RC2000: it allows the user to reset the
solid state drive circuits if an azimuth or elevation alarm has
Appendix E Communications Protocol
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