Manual

Front Panel Functions 4-5
Joystick
The optional external joystick produces the same effects as the Arrow buttons. If you move
the stick away from its center position the motor takes one step, and after a while begins
moving slowly. The button at the end of the stick has the same effect as FAST. The two
buttons on the joystick housing are both TEACH buttons.
If the Arrow Buttons are in Z mode then the joystick affects the Z motor instead of X and Y.
Manual Re-reference
If the FAST button is held down while the GO TO ORIGIN button is pressed, the System
performs a manual re-reference operation. First the machine finds the X and Y Home
switches, as though an FH command had been received. Then the machine performs a
vector back to the position it "thought" it was at before the button was pressed. The No
Reference status bit is cleared. (See the OS command in Chapter 3.)
This sequence can be used to reestablish the position reference if it has been lost, for
example due to the carriage having "crashed" into a fixed object. The host computer
program or Download Sequence does not necessarily have to be restarted.
A manual re-reference can also be used after reset or power up, to provide a known position
reference and travel limits for manual (Arrow button) XY carriage motion and for setting the
Origin. However, it is recommended that the host program always execute the FH command
as the first command after reset or power up, to be sure that the position reference has been
established.
The direction, speed, half-step mode, and maximum distance can be changed via personality
parameters 31, 44, 46, and 16, respectively; see Chapter 7.
If the Arrow Buttons are in Z mode then the manual re-reference causes the Z motor to seek
the Z Home switch. (It does not return to where it "thought" it was.) X and Y are not
affected. The No Z Reference status bit is cleared. (See the OS command.)
The XY manual re-reference can be configured to automatically find Z Home first, for
example, to prevent crashing into fixturing during the XY motion. See personality
parameter 48.
Invoke Download Sequence
If the FAST button is held down while the PAUSE or TEACH button is pressed, the System
invokes Download Sequence 0 or 1, respectively. The Download Sequence executes as
many times as specified by the <rept> parameter of the BD command which created it, and
then it quits. See the BD and ED commands in Chapter 3.
While the Download Sequence is executing, all front panel buttons have their normal
functions but the System does not process ACL commands from the host computer.