Watlow CLS200 Manual de usuario Pagina 64

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Chapter 2: Installation CLS200 Series User’s Guide
48 Watlow Anafaze Doc.# 0600-3050-2000
To avoid unacceptable interference, use less than 10 feet
(3 m) of cable from the terminal or connector to the CLS200
serial port.
Some systems may experience problems with sensor signal
reading if the commons of multiple controllers are connect-
ed. See Signal Common on page 48.
Refer to Termination on page 48 for more on terminating
resistors.
Connect the shield drain to earth ground only at computer
or host end.
.
Figure 2.33 Recommended System
Connections
Signal Common
For usual installations, do not connect the dc commons of
the controllers together or to the converter or host device.
Use an optically isolating EIA/TIA-232-to-485 converter to
prevent problems with sensor readings.
Termination
In order for EIA/TIA-485 signals to be transmitted proper-
ly, each pair must be properly terminated. The value of the
termination resistor should be equal to the impedance of
the communications cable used. Values are typically 150 to
200 .
The receive lines at the converter or host device should be
terminated in the converter, the connector to the host de-
vice or the device itself. Typically the converter documenta-
tion provides instructions for termination.
Use a terminating resistor on the receive lines on the last
controller on the 485 line. Set JU1 inside the CLS200 in po-
sition B to connect a 200 resistor across the receive lines.
Refer to Changing Communications on page 179.
WATLOW ANAFAZE CLS200WATLOW ANAFAZE CLS200
LOOPLOOP
PROCESSPROCESS
UNITSUNITS
ALARMALARM
SETPOINTSETPOINT
STATUSSTATUS
OUT%OUT%
MAN
AUTO
MAN
AUTO
CHNG
SP
CHNG
SP
A
LA
R
M
A
C
K
ALARM
ACK
RAMP
SOAK
RAMP
SOAK
Y
E
S
YES
N
O
NO
B
A
C
K
BACK
E
N
T
E
R
ENTER
WATLOW ANAFAZE CLS200WATLOW ANAFAZE CLS200
LOOPLOOP
PROCESSPROCESS
UNITSUNITS
ALARMALARM
SETPOINTSETPOINT
STATUSSTATUS
OUT%OUT%
M
A
N
A
U
T
O
MAN
AUTO
C
H
N
G
S
P
CHNG
SP
A
L
A
R
M
A
C
K
ALARM
ACK
R
A
M
P
S
O
A
K
RAMP
SOAK
YES
NO
BA
CK
BACK
ENTER ENTER
Serial Port
232 Communications 485 Communications
Shielded Twisted Pair Cable
Optically
Isolating
232 to 485
First CLS200 Second CLS200 Last CLS200
Converter
WATLOW ANAFAZE CLS200WATLOW ANAFAZE CLS200
LOOPLOOP
PROCESSPROCESS
UNITSUNITS
ALARMALARM
SETPOINTSETPOINT
STATUSSTATUS
OUT%OUT%
M
A
N
A
U
T
O
MAN
AUTO
C
H
N
G
S
P
CHNG
SP
A
L
A
R
M
A
C
K
ALARM
ACK
R
A
M
P
S
O
A
K
RAMP
SOAK
YES
NO
B
AC
K
BACK
ENTER ENTER
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