Siemens siprotec 7SA6 User Manual page 565

7SA6 Manual
C53000-G1176-C133-1
Table 8-5 Jumper setting of CTS (Clear-To-Send) on the processor printed circuit
board C-CPU-2
Jumper /CTS of interface RS232
X111
The jumper presetting is dependent on the order code of the device.
For RS232 (12th digit of order code = 0, 1):
For RS485 (12th digit of order code = 2:
If there are no external matching resistors in the system, the last devices on a
RS485-bus must be configured via jumpers X103 and X104.
Table 8-6 Jumper setting of matching resistors of the interface RS485 on the processor
printed circuit board C–CPU–2
Jumper Matching resistor
X103
X104
Note: Both jumpers must always be plugged in the same way!
Currently no function is assigned to the jumper X90. The presetting is 1-2.
The terminating resistors can also be connected externally (e.g. to the connection
module). In this case, the terminating resistors located on the RS485 or the Profibus
interface module or the resistors located directly on the processor circuit board C–
CPU–2 must be disconnected.
+5 V
390 Ω
A/A´
220 Ω
B/B´
390 Ω
Figure 8-12 Termination of the RS 485 interface (external)
1–2
Matching resistor
closed
2–3
2–3
Installation and Commissioning
/CTS controlled by /RTS
2–3
setting 1–2
setting 2–3
Presetting
open
1–2
1–2
1–2
1–2
8-21