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Interface RS232
7SA6 Manual
C53000-G1176-C156-2
Table 8-22
Exchangeable interface modules
Interface
System Interface
or Analog Output
Analog Output
The interface RS232 can be modified to interface RS485, according to Figure 8-21.
Figure 8-19 shows the printed circuit board C–CPU–2 and the interface modules. Fi-
gure 8-20 shows the location of the jumpers of interface RS232 on the interface mo-
dule.
Terminating resistors are not required. They are disconnected.
Terminating Resistors
Jumper
disconnected
X3
1–2 *)
X4
1–2 *)
*) Default Setting
Figure 8-20 Location of the jumpers for configuration of RS232
With jumper X11, CTS is activated which is necessary for the communication with the
modem.
Tabelle 8-23 Jumper setting of CTS (Clear-To-Send) on the interface module
Jumper
/CTS from interface RS232
X11
*) Default Setting
Jumper setting 2–3: the connection to the modem is usually done with star coupler
or optical fibre converter. Therefore the modem control signal according to RS232
standard DIN 66020 is not available. Modem signals are not required since communi-
®
cation to SIPROTEC
devices is always carried out in the half duplex mode. Use
connetion cable with ordering number 7XV5100–4.
Jumper setting 1–2: this setting makes the modem signal available, i. e. for a direct
RS232-connection between the SIPROTEC
Mounting Location
B
D
1
2
3
1
2
3
1
2
3
1
2
1–2
®
device and the modem this setting can
Installation and Commissioning
Exchange Module
only interface modules that can
be ordered as an option of the
device
Appendix
(see
AN20
AN20
1
2
3
X3
X6
X7
X4
X12
X5
1
2
3
X10
3
1
2
3
C53207-
A324-B180
/CTS triggered by /RTS
2–3 *)
).
8-37
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