4
2.6
Serial Connections – Fig. 2.3
Information.
•
Up to
10 slaves
can be connected to a single
RS422
adaptor card on a PC.
•
Up to
32 slaves
can be connected to a single
RS485
adaptor card on a PC.
•
The maximum serial data transmission line length for both
RS422
and
RS485
systems is 1200m.
All connections, apart from those for serial data communication, are made as shown in
Section 7 of the User Guide.
Make serial data connections as shown in Fig. 2.3. The type of cable used is dependent on the cable length:
Up to 6m
– standard screened or twisted pair cable
Up to 300m
– twin twisted pair with overall foil screen and an integral drain wire, e.g. Belden 9502 or equivalent
Up to 1200m – twin twisted pair with separate foil screens and integral drain wires for each pair, e.g. Belden 9729 or
equivalent.
…2
ELECTRICAL INSTALLATION
Fig. 2.3 Serial Module Connections
Table 2.1 Terminal and Pin Identification
Serial Module Connections
1
2
3
4
5
F
TB1
TB2
TB3
TB4
6
7
8
9
10
Tx+
Tx–
Rx+
Rx–
GND
Tx+
Tx–
Rx+
Rx–
GND
OPTO22 Adaptor
Board Connections
8
5
4
9
3
Screen
Process Recorder
e
l
u
d
o
M
l
a
i
r
e
S
r
e
d
r
o
c
e
R
s
s
e
c
o
r
P
n
o
i
t
a
c
i
f
i
t
n
e
d
I
n
i
P
d
r
a
o
B
2
2
O
T
P
O
r
e
b
m
u
N
l
a
n
i
m
r
e
T
s
n
o
i
t
c
e
n
n
o
C
4
3
C
A
&
T
A
4
2
C
A
r
e
b
m
u
N
t
r
a
P
s
n
o
i
t
c
e
n
n
o
C
2
–
X
T
9
–
X
R
3
+
X
T
8
+
X
R
5
+
X
R
4
+
X
T
6
–
X
R
5
–
X
T
8
D
N
G
3
D
N
G