Specifications

Page 22–2
FOCUS System Manual
22.2 Application
The SRD Module's four independent channels and
transparent RS-232C communication capability
give you a wide assortment of useful applications.
You can connect modems and other communica-
tion devices to each channel independently.
You can use one or all of the module's channels for
Supervisory Control and Data Acquisition
(SCADA) and other data terminal communica-
tions requirements. The module is especially
useful when extension of the SCADA communi-
cations lines to remote sites is inconvenient or
expensive. The two most typical types of applica-
tion are 1) connecting remote terminal units
(RTUs) from remote locations to a master and 2)
connecting other types of terminal equipment
RS-232
DB-25 (Male)
Cable assy.
01W1-53C49-002
(A)
(B)
RS-232
DB-9 (Female)
RS-232
DB-9 (Female)
Figure 22–4. SRD-4, SRD-4N Interface Cable.
Figure 22–5. SRD-2 Configuration Example.
SCADA
Computer
MODEM
MODEM MODEM
DTE Device
DTE Device
MODEM
RTURTU
RTU
FOCUS
FOCUS
FOCUS Link
Substation A
Substation B
Substation C
SCADA
Line
Ch. A
Ch. A
Ch. B
Ch. B
Low Speed Data (232) Module
Figure 22–3. SRD-4, SRD-4N Interface Module.
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
J2
J3
TX-C
TX-D
+
+
+
+
–
–
–
–
RX-C
RX-D
GND-C
GND-D
SRD
DB25
(Female)
Compression
Type
Terminal
Block
RS-232
CIRCUIT A
RS-232
CIRCUIT A
14 RTS
15 RXDATA
16 TXDATA
17 +5V
18 GND
CTS 1
CTS 13
RS-232
CIRCUIT B
RS-485
CIRCUIT C
RS-485
CIRCUIT D
RTS 2
RXDATA 3
TXDATA 4
+5V 5
GND 6