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RC4000 Antenna Controller
3.1 Device Type Query Command
The SA Bus specification 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 3,4
bytes 5-8
byte 9
byte 10
3.2 Device Status Poll Command
The SA Bus specification requires that command character 31h cause a device to return 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 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 is:
byte 0
byte 1
byte 2
bytes 3-12
byte 13
Appendix REM
STX
A
RC4000 address
30h
30 hex – the device type query command code
ETX
checksum
ACK
A
RC4000 address
30h
the device type query command code
"4K"
controller type
'"A.BC"
version number – example: 1.22
ETX
checksum
STX
A
RC4000 address
31h
the status poll query command code
ETX
checksum
ACK
A
RC4000 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 padded with blanks. If a satellite
name is not currently displayed, this field will contain blanks.
not used
reserved for future use, currently initialized to 0100$0000b.
REM-9
Remote Control Option
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