Two
controls
linked
together
by
the
VXM
bus
make
it
possible
to
run
3
or
4
motors
with
all
programs
residing
in
one
VXM,
and
all
communication
from
a
host
with
this
one
VXM.
(Input
4.)
The
VXM
bus
is
a
serial
bus
conforming
to
the
I
C
specification.
This
bus
is
used
to
transfer
data
back
and
forth
between
two
VXM
controls
that
are
configured
as
Master
and
Slave.
Use
only
a
Velmex
approved
cable
for
the
bus
connection,
telephone
handset
cables
will
not
work.
Telephone
cables
reverse
the
1
and
4
connection,
a
straight
through
cable
is
required.
Bus
cables
should
be
short
and
not
be
near
other
cables
or
electronic
devices.
By
default
all
VXMs
are
Slaves.
To
link
VXMs,
one
control
should
be
set
to
be
a
Master
(see
Control
Mode
FRPPDQG
"
setDM
"
in
the
Appendix
O.)
The
Velmex
COSMOS
program
will
configure
the
VXMs
for
Master/Slave
operation.
A
designated
Master
will
attempt
to
establish
communications
to
a
Slave
on
power-up.
If
the
Master
can
not
find
the
Slave
it
will
try
again
when
it
is
required
to
send
a
motor
3
It
is
normal
for
the
Slave
not
to
flash
its
power
light
(green
LED)
at
power-up.
A
bus
error
will
occur
(”
ËB
”
sent
to
host
and
VXM
resets)
if
the
Master
can
not
find
the
Slave,
either
because
there
is
not
one
connected,
or
it
is
not
powered.
The
Master
is
the
VXM
that
runs
motors
1
and
2,
communicates
with
a
host,
and
can
be
started
with
the
Run
input
and
stopped
with
the
Stop
input
The
Slave
runs
motors
3
and
4
(The
Master
assigns
motors
3
and
4
to
motors
1
and
2
on
the
Slave)
and
receives
all
commands
over
the
VXM
bus
from
the
Master.
·
The
Master
disables
the
Run,
Stop,
and
RS-232
inputs
on
the
Slave.
2
Considerations when linking VXM controls together:
or
4
command.
NOTE:
·
·
·
·
·
·
·
·
Linking VXMs for 3 & 4 Motors (VXM-3,4)
10
+
+
+
+
VXM
SteppingStepping
MotorMotor
ControllerController
www.velmex.com
Bus
Bus
VXMVXM
Stop
RunRun
On-LineOn-Line
LocalLocal
-
-
+
+
Jog 1
Jog 2
+
+
+
+
VXM
SteppingStepping
MotorMotor
ControllerController
wwwwww.velmex.com.velmex.com
Bus
Bus
VXMVXM
Stop
Run
On-Line
Local
-
-
+
+
Jog 1Jog 1
Jog 2Jog 2
M2
M4
M1
M3
L2
L1
L4
L3
Master
Slave
VXM
Bus
Cable
Part
#
4-2122
$*.3
Index Motor 3 Example
Graphic Representation:
®
start
end
¬
Clear
previous
entries,
Index
Motor
3
+400
steps
NOTE:
Slave
RS-232
port
is
not
used
