4-14 Input / Output
MN1957
www.baldormotion.com
4.4.2 Stepper control outputs - models NSB203... / NSB205...
The stepper control outputs are available on connectors X2 and X3, as shown in section
4.1.1. There are four sets of stepper motor control outputs, operating in the range 0 Hz to
500 kHz. Each of the step (pulse) and direction signals from the NextMove ESB-2 is driven
by a ULN2803 open collector Darlington output device. The
STEPPERDELAY
keyword allows
a 0 - 4.25
μ
s delay to be introduced between state changes of the step and direction outputs.
The
FREQ
keyword can be used to directly control the output frequency, between 60 Hz and
500 kHz - see the Mint help file.
The ULN2803 drivers are static sensitive devices. Take appropriate ESD
precautions when handling the NextMove ESB-2. A 5 V, 600 mA supply is
provided on connectors X2 and X3 for powering external circuits, as shown in
Figure 19. The same 5 V supply is also present on connectors X5, X6, X7, X14
and X15 for powering encoders. Ensure that the total combined current demand of all 5 V
outputs does not exceed 1.8 A. In situations where induced noise is affecting a step or
direction output, it may be necessary to connect a 5 k
Ω
or 10 k
Ω
pull-up resistor between the
output and the 5 V supply (pin 4).
Figure 19: NSB203... / NSB205... only: Connections to a typical stepper drive
(e.g. Baldor DSMS series)
CAUTION
S
te
pp
er drive o
p
to-isolated in
p
uts
O
ptocoup
l
er
reference
Step c
l
oc
k
i
nput
CW/CCW
d
i
rect
i
on
i
nput
Ena
bl
e
i
nput
UL
N280
3
UL
N280
3
74AHC
T
244
74AHC
T
244
NextMove E
S
B-2
S
T
EP0
D
IR
0
D
GN
D
R
E
L COM
R
E
L NC
+5V
X2
X12
3
5
1
7
8
4
S
te
p
out
p
ut
Direction
out
p
ut
Ena
b
le
G
ND
G
ND
+
5
V
+
5
V
Servo Systems Co. • 115 Main Road • P.O. Box 97 • Montville, NJ,
07045-0097 • (973) 335-1007 • Toll Free: (800) 922-1103
Fax: (973) 335-1661 • www.servosystems.com
