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SDM-CD16
Control Port Expansion Module with Drivers
Table
1.
Dataloggerto cD16 connections
CONNECTION
ORDER
SDM-CD16
First
Gnd
Second
12V
DATALOGGER
Gnd
12V on
datalogger
or
e)fternalsupply
C1 (Control Port
1)
C2 (Control Port
2)
C3 (Control Port
3)
FUNCTION
Common ground
Power
Data
Clock
Enable
c1
c2
c3
4.
CONNECTIONS
CAUTION: The order
in
which
connections are made
is
critical.
ALWAYS
CONNECT GROUND
FIRST,
followed by
12V
and then the
Control
Ports.
In
the
time between connecting power to the
SDM-CD16 and the execution
of
the
datalogger
Instruction
controlling the
SDM-CD'16,
the state
of
the
16
channels is
indeterminate. To avoid
activating a relay, solenoid,
or resistive load
during this
time period,
SDM-CD16
toggle
switches
should be
in
the "Off"
position.
Once
all
connections are made and the program
is
running, the
toggle switches should be moved
to
the "Auto" position.
Under the "To Datalogger"
portion
of
the
SDM-
CD16, make the
connections to the datalogger
shown
in
Table
1:
lf relays
or solenoids
are
to
be
activated,
and
they
are
all
powered
by
the same external
supply, connect
the
SDM-CD16
to
the relay or
solenoid power supply
as
follows:
SDM-CD16
RELAY OR
SOLENOID
SUPPLY
Ind.
Clamp
Power
Gnd
Power Ground
The SDM-CD16
has a
diode between each
OUTPUT
and
the lND.
CI-AMP
(inductive clamp,
see Figures
1
and
2).
This
diode clamps the coil
current when
the
FET
opens.
lf
various relays or
solenoids are used requiring different supply
voltage levels, DO NOT connect to the
lND.
CLAMP
terminal.
For
this situation, diodes must
be provided
externalto the SDM-CD16, as shown
in Figure
3.
For non-inductive loads, connection
to the
Ind.
Clamp input is not necessary.
Multiple SDM-CD16's may
be
wired in parallel by
connecting the
datalogger side of one
SDM-
CD16
to
the
next.
For
CR10
and
2'lX
dataloggers, the
total cable length connecting
SDM-CD16's
to
SDM-CD16's and the
datalogger
should not exceed
20
feet.
Total cable lengths
in
excess
of 20
feet will adversely influence
communication performance. For
CR7
dataloggers, the
total cable length should not
exceed
600 feet.
5.
ADDRESS SELECTION JUMPERS
Each SDM-CD16
can have
1
of
16
addresses.
Shipped
from the factory, the address
is
set
at
00.
The
address
jumpers,
G2
and
J2,
are
shown
in Figure
4.
For
both
G2
and
J2: Pin
1
jumpered
to 8
is
Position 0; pin
2
jumpered to
7 is
Position
1;
pin
3
jumpered
to 6 is Position 2;
pin 4
jumpered
to 5 is Position
3.
The
following table
shows
jumper position and the corresponding
address.
JE PISITIIN
0
I
)
L
I
00
01
u(
03
10
11
ta
I(
{a
IJ
a0
?I
((
r'1
{t
I
?l
J(
{1
BASE
4
ADDRISS
MATRIX
(00,
01,
02
, , ,
3e,
33)
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