% fs <focus_number> <focus_control_command> [<argument> ...]The following value are currently available as focus_number.
1 - the Slit viewerAnd, the following commands are currently available as focus_control_command.
2 - the optical channel
3 - the IR1 channel
4 - the IR2 channel
sl - the Slit viewer (alias 1)
br - the optical channel (alias 2)
jh - the IR1 channel (alias 3)
kl - the IR2 channel (alias 4)
all - the Slit viewer and all channels
For several focus control commands mv and set, the command accepts the following omitted usage as well.
param - Set the motor control parameters for the focus. rst - Move until turn on the front limit switch, then the position is set to zero. ml - Move until turn on the front or back limit switch. (the command requires 0 for front, or 1 for back, as id of the limit switch) mv - Move by requested step. (the command accepts -260 to 260 as step.) set - Move to requested position. (the command accepts 0 to 260 as position.) pos - Show current position of the focus. init - Move to the initial position of the focus. test - Test both front and back limit positions.
% fs <focus_number> [+|-]<number>If you add a plus or minus sign to a number, the number will be interpret as the step number for the control command mv. If you do not, it will be interpret as the position number for the control command set.
The each step represents movement of the detector by 5µm, with
increasing number indicating movement of the detector away from the slit/mask
plane (that is, away from a telescope). The each front limit position is
usually used the zero point. The each stroke between a front limit and
a back limit is 200 to 260 steps.