Watlow CAS200 Manual de usuario Pagina 40

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Chapter 2: Installation CAS200 User’s Guide
28 Watlow Anafaze
Figure 2.15 Recommended System
Connections
Signal Common
For usual installations, do not connect the dc commons of
the scanners together or to the converter or host device.
Use an optically isolating 232-to-485 converter to prevent
problems with sensor readings.
Termination
For EIA/TIA-485 signals to be transmitted properly, 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
device or the device itself. Typically the converter
documentation provides instructions for termination.
Use a terminating resistor on the receive lines on the last
scanner on the 485 line. Set jumper JU1 in position B to
connect a 200 resistor across the receive lines. See
Changing Communications on page 81.
WATLOW ANAFAZE CLS200WATLOW ANAFAZE CLS200
LO
O
P
LOOP
P
R
O
C
ESS
PROCESS
U
NIT
S
UNITS
A
L
A
RM
ALARM
SE
T
P
O
I
N
T
SETPOINT
S
TAT
U
S
STATUS
O
UT%
OUT%
M
AN
AUTO
MAN
AUTO
CHN
G
SP
CHNG
SP
A
L
A
R
M
A
C
K
ALARM
ACK
RA
MP
SO
AK
RAMP
SOAK
Y
E
S
YES
N
O
NO
BA
CK
BACK
E
N
T
E
R
ENTER
WATLOW ANAFAZE CLS200WATLOW ANAFAZE CLS200
LO
O
P
LOOP
P
RO
C
ES
S
PROCESS
UNIT
S
UNITS
A
LAR
M
ALARM
S
ET
PO
IN
T
SETPOINT
S
TAT
U
S
STATUS
O
U
T%
OUT%
MAN
AUTO
MAN
AUTO
CHN
G
SP
CHNG
SP
A
L
A
R
M
A
C
K
ALARM
ACK
RA
M
P
SO
AK
RAMP
SOAK
Y
E
S
YES
N
O
NO
BACK BACK
E
N
T
E
R
ENTER
WATLOW ANAFAZE CLS200WATLOW ANAFAZE CLS200
LO
O
P
LOOP
P
RO
CE
SS
PROCESS
UN
IT
S
UNITS
ALA
R
M
ALARM
SET
P
O
IN
T
SETPOINT
S
TAT
U
S
STATUS
O
UT%
OUT%
M
AN
A
UTO
MAN
AUTO
CHN
G
SP
CHNG
SP
A
L
A
R
M
A
C
K
ALARM
ACK
RAM
P
SO
AK
RAMP
SOAK
Y
E
S
YES
N
O
NO
BA
CK
BACK
E
N
T
E
R
ENTER
Serial Port
232 Communications 485 Communications
Shielded Twisted Pair Cable
Optically
Isolating
232-to-485
First CAS200 Second CAS200
Last CAS200
Converter
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