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ADVANCED MICRO SYSTEMS, INC. SMC-27X2 SOFTWARE
40
Function Type NV Bytes
Set Step Size Resolution Default, Immediate, Program 2
Command
H
Mnemonic
(Name) H (n)
Data 1
0-5
Data 2
None
Result
None
H (Step Resolution)
This command selects step size resolution. The SMC-27X2 has an internal lookup table of up to 32 bytes
corresponding to 1/8 step. This specifies which table is to be used. Each time this command is executed the
values are reset to “step 1” and the armature is repositioned to the start phase. Initial and final velocities
may require appropriate changes.
The H command sets the phase switching sequence:
Sequence
H Command
Steps per rev.
(1.8 deg) Motor)
Remark
1/8 Micro H 0 1600 Highest resolution smoothest
1/4 Micro H 1 800 Resonance reduced or higher resolution
Half H 2 400 High torque - 1 phase on/2 phase on
Full H 3 200 Highest torque - 2 phase on
1/2 Micro H 4 400 Low torque - half step
Wave H 5 200 One phase on - full step
This command is generally implemented during the initial customer default parameter assignment. However,
it may be implemented and changed within a program. Following, is an example:
P 0 Enter program mode.
H 1 Change the resolution to ¼ step.
P Exit program mode.
Function Type NV Bytes
Set Initial Velocity Default, Immediate, Program 3
Command
I
Mnemonic
(Name) I (n)
Data 1
SPS (40-36,000)
Data 2
None
Result
None
I (Initial Velocity)
This parameter sets the initial velocity in steps per second. This is the first speed used at the beginning of
acceleration. It must be slow enough that the motor can start without loosing steps (stalling).
As with all velocity parameters, the initial velocity is divided by the divide factor (D). Using the examine (X)
command displays updated velocities. The initial velocity applies to:
1. All index commands (+, -, R).
2. First execute in constant velocity.
3. Decelerate to 0 in constant velocity or soft stop.
4. Final phase in home command if home speed is above initial velocity.
See “Default Table” in the beginning of this section.
This command is generally implemented during the initial customer default parameter assignment. However,
it may be implemented and changed within a program. Following, is an example:
P 0 Enter program mode.
I 100 Change the initial velocity to 100 SPS.
P Exit program mode.