Nexstar SynScan Manuel D’Utilisation

Physical Connection Diagram

RJ-11 Connector

RJ-11

NC
RD
GND
NC

The Back of the

Pinout

Additional

Commands

Sending a track rate through

to the hand control

1. Multiply the desired tracking rate (arc seconds /second) by 4. For example: if the

desired track rate is 120 arc

(proximately

times of sidereal rate),

then the

480.

2. Separate

TRACKRATE

into

two

bytes,

such

that

(TRACKRATE

+ TrackRateLowByte). For example TRACKRATE

480,

then TrackRateHighByte

1, TrackRateLowByte

224.

To send a tracking rate, send the following 8 bytes:

a. Positive Azm tracking: 80, 3, 16, 6, TrackRateHighByte, TrackRateLowByte,
b. Negative Azm tracking: 80, 3, 16, 7, TrackRateHighByte, TrackRateLowByte,
c. Positive Alt tracking: 80, 3, 17, 6, TrackRateHighByte, TrackRateLowByte,
d. Negative Alt tracking: 80, 3, 17, 7, TrackRateHighByte, TrackRateLowByte,

4. The number 35 is returned from the hand control.

Sending a slow-Goto command through

to the hand control

1. Convert the angle position to a

number. Example: if the desired position is

then

10,252,743

2. Separate

into three bytes such that

PosHighByte

65536 + PosMedByte

256 + PosLowByte). Example: PosHighByte

156, PosMedByte

11 3, PosLowByte

199

3. Send the following 8 bytes:

a. Azm Slow

80, 4, 16, 23, PosHighByte, PosMedByte, PosLowByte,

b. Alt Slow

80, 4, 17, 23, PosHighByte, PosMedByte, PosLowByte,

4. The number 35 is returned from the hand control.

Reseting the position of

or Alt

1. Convert the angle position to a

number, same as Slow-Goto example.\

2. Send the following 8 bytes:

a. Azm Set Position: 80, 4, 16, 4, PosHighByte, PosMedByte, PosLowByte,
b. Alt Set Position: 80, 4, 17, 4, PosHighByte, PosMedByte, PosLowByte,

3. The number 35 is returned from the hand control.