Research Concepts RC2000C - Manual (Page 99)

RC2000C Az/El Tracking Antenna Controller Appendix E Communications Protocol 91
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byte 1: A where A is the RC2000 address
byte 2: 33h the command code
byte 3: direction this field can specify 'E', 'W', 'D', 'U' or 'X'. 'E' refers to Azim
CCW, 'W' to Azim CW, 'D' refers to down, and 'U' refers to up.
An 'X' specifies that the antenna stop moving.
byte 4: speed This field specifies the jog speed, either 'F' (Fast) or 'S' (Slow).
Note that this field must contain a valid value even if the
direction field specifies 'X' (Stop).
bytes 5-8: duration This field specifies the duration of the jog command in
milliseconds. The valid range of values for this field is '0000' to
'9999'. As a practical matter, the resolution of the timer used to
time the move is approximately 150 milliseconds, so any move
will be for a time interval equal to a multiple of approx. 150
milliseconds. Note that this command must contain a valid
value even if the direction field specifies 'X' (Stop).
byte 9: ETX
byte 10: 'chksum' the checksum
The reply to this command will be the same as the reply to the status poll query except that the
command code will be '33h'.
POLARIZATION COMMAND
The following command specifies a polarization jog. The command contains 6 bytes. Byte 3 can
contain one of the following values...
'C'... jog the polarization clockwise.
'W'... jog the polarization counter clockwise. Note that there is not a duration or a speed
associated with these commands. For a polarotor, the jog duration is fixed. For a
rotating feed the jog duration is determined by the Rotating Feed Jog Duration CONFIG
mode item An interruption occurs if another command does not arrive before the
previous polarization command terminates.
'H'... move to the preset horizontal position of the satellite closest to the antenna's present
azimuth position.
'V'... move to the preset vertical position of the satellite closest to the antenna's present
azimuth position.
The format of the command is as follows;
byte 0: STX
byte 1: A where A is the RC2000 address
byte 2: 34h the command code
byte 3: 'X' the polarization movement code
byte 4: ETX
byte 5: checksum
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.
MISCELLANEOUS COMMAND
This command performs miscellaneous functions. Here is the format of the command.