Celestron CGEM DX 1400 HD Computerized Telescope CGEM DX Mount Manual - Page 28

Additional RS232 Commands Send Any Track Rate Through RS232 To The Motor Control 1. Multiply the desired tracking rate (arcseconds/second) by 4. Example: if the desired trackrate is 150 arcseconds/second, then TRACKRATE = 600 2. Separate TRACKRATE into two bytes, such that (TRACKRATE = TrackRateHigh x 256 + rackRateLow). Example: TrackRateHigh = 2 TrackRateLow = 88 3. To send a tracking rate, send the following 8 bytes: a) Positive Azm tracking: 80, 3, 16, 6, TrackRateHigh, TrackRateLow, 0, 0 b) Negative Azm tracking: 80, 3, 16, 7, TrackRateHigh, TrackRateLow, 0, 0 c) Positive Alt tracking: 80, 3, 17, 6, TrackRateHigh, TrackRateLow, 0, 0 d) Negative Alt tracking: 80, 3, 17, 7, TrackRateHigh, TrackRateLow, 0, 0 4. The number 35 is returned from the handcontrol Send A Slow-Goto Command Through RS232 To The Hand Control (note: Only valid for motorcontrol version 4.1 or greater) 1. Convert the angle position to a 24bit number. Example: if the desired position is 220°, then POSITION_24BIT = (220/360) x 224 = 10,252,743 2. Separate POSITION_24BIT into three bytes such that (POSITION_24BIT = PosHigh x 65536 + PosMed x 256 + PosLow). Exampe: PosHigh = 156, PosMed = 113, PosLow = 199 3. Send the following 8 bytes: a) Azm Slow Goto: 80, 4, 16, 23, PosHigh, PosMed, PosLow, 0 b) Alt Slow Goto: 80, 4, 17, 23, PosHigh, PosMed, PosLow, 0 4. The number 35 is returned from the handcontrol Reset The Position Of Azm Or Alt 1. Convert the angle position to a 24bit number, same as Slow-Goto example. 2. Send the following 8 bytes: a) Azm Set Position: 80, 4, 16, 4, PosHigh, PosMed, PosLow, 0 b) Alt Set Position: 80, 4, 17, 4, PosHigh, PosMed, PosLow, 0 3. The number 35 is returned from the handcontrol 4. Note: If using Motorcontrol version less than 4.1, then send: a) Azm Set Position: 80, 3, 16, 4, PosHigh, PosMed, PosLow, 0 b) Alt Set Position: 80, 3, 17, 4, PosHigh, PosMed, PosLow, 0 26