DMC-21x3 Accessories Chapter 5 SDM-20240/20242• 33
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Additional Settings for SDM-20242
Micro Step jumpers (JP1)
Determines whether pulses from the controller are interpreted by the Driver chips as whole, half,
or micro-step increments.
No Jumper = Full step
1
M1 ON only = Half step
M2 ON only = 1/4
th
step
M1 and M2 ON = 1/16
th
step
1
When running in full step mode – the current to the motor is 70% of maximum. All micro-step
settings are able to deliver full current
Protection Circuitry and Error LED
The SDM-20242 has short circuit protection circuitry as well as under/over voltage and over
temperature protection. Here is a list of possible reasons for the Error LED to turn on and stop all
motors from operating:
• If the motor leads are shorted together, or shorted to ground
• Power is applied to the controller before the driver board
When the LED comes on, the error has to be cleared by issuing MO;SH. If the controller is in
LC*=1 mode, an LC*=0;LC*=1 command is required to clear the error condition.
ELO (Emergency Lock Out)
The Emergency Lock Out jumper (ELO on JP1) is a jumper setting on the SDM-20242 which
configures the driver’s behavior when the abort line goes low. With the jumper absent (default),
the behavior of the motors is subject to the OE command. When the jumper is installed, the
amplifiers will be immediately shut down at a hardware level (bypasses the controller firmware).
When the ELO jumper is installed, the OE command should be set to 1. To recover, issue
MO;SH.
Fault Output from SDM-20242
The fault output jumper allows the user to choose to bring out the amplifier’s error signal to either
the Abort line or Input 7 of the controller. With no jumper – the fault signal is not connected to
the controller at all. If a jumper is placed between the center pin and towards the side that says
7_IN – then input 7 is used. Conversely, if the jumper is placed between the center pin and the
side that says ABORT – the Abort line is jumpered to the fault output.
JP5 FLT
7_IN
ABORT
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