RESEARCH CONCEPTS RC2000A DUAL AXIS Instructions Manual page 73

RC2000A Dual Axis Antenna Controller
byte 1:
byte 2:
byte 3:
byte 4:
DEVICE TYPE QUERY COMMAND
The SA Bus specifications requires that command character 30h must trigger the return of the six
character device type string. The message format for this query will be ...
byte 0:
byte 1:
byte 2:
byte 3:
byte 4:
The reply to this query will consist of 11 bytes ...
byte 0:
byte 1:
byte 2:
bytes 3-6:
bytes 7,8:
byte 9:
byte 10:
DEVICE STATUS POLL COMMAND
The SA Bus specification requires that command character 31h cause a device to return its status
information. The reply to this command includes azimuth, elevation and polarization position, current
satellite name, as well as limit, alarm and drive status information. The status poll command message
consists of 5 bytes and the format is;
byte 0:
byte 1:
byte 2:
byte 3:
byte 4:
The response to this command will consist of 38 bytes, which will be a combination of ASCII and binary
data fields. The binary data will be placed in the lower nibble of a byte whose higher nibble will be
initialized to a value which will make the result an ASCII character. The idea with this response is to be
able to reproduce the information presented on the LCD to the user when MANUAL mode is active. The
format of the response will be;
byte 0:
byte 1:
byte 2:
bytes 3-12:
byte 13:
7 6 5 4 3 2 1 0
0 0 1 0 $ 0 0 _ _
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A where A is the RC2000 address
'CC' the command code of the unrecognized message.
ETX
checksum
STX
A where A is the RC2000 address
30h 30 hex - the device type query command code
ETX
checksum
ACK
A where A is the RC2000 address
30h the device type query command code
'RC2K'
'XX' where XX is the version number, for example if the current
software version number were 2.65, XX would be '26'.
ETX
checksum
STX
A where A is the RC2000 address
31h the status poll query command code
ETX
checksum
ACK
A where A is the RC2000 address
31h the status poll query command code
sat_name This field will contain the satellite name in upper case letters. If
the name does not occupy the entire field the name will be left
justified and the string will be right padded with blanks. If a
satellite name is not currently displayed, this field will contain
blanks.
sat_name status - binary data
Appendix E Communications Protocol
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73