Research Concepts RC2500 - Manual (Page 85)

78 RC2500 Antenna Controller Appendix E RC2500 Comm Protocol
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byte 4 checksum
The reply to this query will consist of 11 bytes ...
byte 0 ACK
byte 1 A where A is the RC2500 address
byte 2 30h the device type query command code
bytes 3-6: 'XXXX' where the value of 'XXXX' depends on the controller and mount
type:
2500 for non inclined orbit tracking controllers
25CA for inclined orbit tracking controllers designed for elevation
over azimuth mounts
25CP for inclined orbit satellite tracking controllers designed for
polar mounts with power declination or power latitude angle
adjust
25CE for inclined orbit tracking controllers designed for azimuth
over elevation type mounts.
bytes 7,8: 'XX' where XX is the version number, for example if the current
software version number were 4.31, XX would be '43'.
byte 9 ETX
byte 10 : checksum
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 STX
byte 1 A where A is the RC2500 address
byte 2 31h the status poll query command code
byte 3 ETX
byte 4 checksum
The response to this command will consist of 52 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 ACK
byte 1 A where A is the RC2500 address
byte 2 31h the status poll query command code
bytes 3-12 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 padded with blanks. If a satellite
name is not currently displayed, this field will contain blanks.
byte 13 not used reserved for future use, currently initialized to 0100$0000b.
byte 14-19 azimuth position This field will contain the formatted azimuth position 0.00
to 359.99. If the azimuth resolver to digital converter detects an
error this field will contain ‘******’.
byte 20-25 elevation position The field will contain the formatted elevation position, ‘-
99.99’ to ‘260.00’. If the elevation resolver to digital converter
detects an error this field will contain ‘******’.
byte 26-30 polarization position This field will contain the formatted polarization position
‘-99.9’ to ‘260.0’. If the antenna is not equipped with a rotating
feed or if the polarization resolver to digital converter detects an
error this field will contain ‘*****’.