Appendix E - Control- 1500A Communications Protocol - Dawn CONTROL-1500A Manual

CONTROL-1500B Single Axis Antenna Controller
Revision History
1.22.92 - Original communications protocol for the CONTROL-2000A derived from the
CONTROL-1000A sabusext.inc file.
4.6.93 - Revised to document the new Auto Move to a target Az/El position command in the
CONTROL 2000A version 1.30 software.
1.2.95 - Revised to document the new Auto Move to a target polarization position command
and the new byte 32 function of the device status poll command reply in the CONTROL-2000A
version 1.31 software.
3.21.95 - Revised for the CONTROL-2000A version 1.32 software which provided support for the
high power polarization option. The POL JAMMED and POL SENSOR alarm messages have
been replaced with the ANT POL alarm. The drive error status field of bytes 27 and 28 has
been removed.
5.31.95 - Revised for the CONTROL-2000C version 1.00 inclined orbit satellite tracking software.
Extra track status information has been included in the device status pol reply. A track
MISCELANEOUS command has been included to set the frequency band for dual band
satellites and to reset track errors.
11.6.95 - Revised for the CONTROL-2000C version 1.1x release. The only change in the comm
protocol is the reply to the Query Id command. The alarm codes that appear in this document
have also been corrected.
2.6.04 – The CONTROL-1500 single axis antenna controller was derived from CONTROL-2000C Polar
dual axis inclined orbit tracking antenna controller. The remote interface of the CONTROL-1500 is nearly
identical to that of the CONTROL-2000. The CONTROL-1500's comm protocol can best be described
as that of the CONTROL-2000C Polar with all of the elevation related fields ignored.Two versions
of the CONTROL-1500 are offered. The CONTROL-1500A is for use with polar mounts looking at
geostationary satellitesThe CONTROL-1500 supports tracking of an inclined orbit satellite with a
single axis mount whose axis of motion is aligned with the apparent motion of the satellite.
OVERVIEW
The CONTROL-1500 command set conforms to the SA Bus protocol originally defined by
Scientific Atlanta. This file describes the commands used to implement the SA bus remote
interface for the CONTROL-1500 antenna controller. See the SA bus specification included
with CONTROL-1500 manual for a complete description of the protocol.
CONTROL- 2000 BAUD RATE - ADDRESS SPECIFICATION
The baud rate and address must be set before communication with a host is possible. These
quantities can be specified in the CONFIG mode. The range of acceptable addresses is 49 to
111. The possible baud rate values are 300, 600, 1200, 2400, 4800, or 9600. The usual SA
Bus baud rate is 9600. For completeness, the transmission parameters are repeated here: 7
data bits, even parity, 1 stop bit.
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Appendix E – CONTROL- 1 500 Communications Protocol
Appendix E Communications Protocol 71