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• RTS = Request to Send
• CTS = Clear to Send
• GND = Signal / Chassis Ground
The cable shield is to be earthed at both line ends. For extremely EMC-prone envi-
ronments, the earth may be connected via a separate individually shielded wire pair to
improve immunity to interference.
Table 3-12
The assignments of the D-subminiature and RJ45 connector for the various interfaces
Pin No.
Operating
RS232
Interface
1
2
RxD
3
TxD
4
-
5
GND
6
-
7
RTS
8
CTS
9
-
1)
Pin 7 may also carry the RS232 RTS signal on an RS485 interface. Pin 7 must therefore not be connected!
RS485 Termination
The RS485 interface is capable of half-duplex service with the signals A/A' and B/B'
with a common relative potential C/C' (GND). It is necessary to check that the termi-
nating resistors are connected to the bus only at the last unit, and not at other devices
on the bus. The jumpers for the terminating resistors are on the interface module (see
Figure3-8 or Figure 3-9) or directly on the C-CPU-2 (see Figure 3-4 and Table 3-7).
Terminating resistors can also be implemented outside the device (e.g. in the plug con-
nectors) as shown in Figure 3-5. In this case, the terminating resistors located on the
module must be disabled.
If the bus is extended, make sure again that only terminating resistors at the last
device to the bus are switched in.
Time Synchronisa-
It is optionally possible to process 5 V, 12 V or 24 V time synchronization signals, pro-
tion Interface
vided that these are connected to the inputs named in the following table.
Table 3-13
1)
7SD610 Manual
C53000-G1176-C145-4
RS485
Shield (with shield ends electrically connected)
RxD
-
TxD
A/A' (RxD/TxD-N)
-
-
GND
C/C' (GND)
-
-
1)
RTS
-
CTS
B/B' (RxD/TxD-P)
-
-
D-subminiature connector assignment of the time synchronization interface
Pin No.
Designation
1
P24_TSIG
2
P5_TSIG
3
M_TSIG
4
M_TSYNC
5
SCREEN
6
7
P12_TSIG
8
P_TSYNC
9
SCREEN
only for PPS signal (GPS)
PROFIBUS DP Slave, RS485
-
B/B' (RxD/TxD-P)
CNTRA-(TTL)
C/C' (GND)
+5 V (max. load < 100 mA)
-
A/A' (RxD/TxD-N)
-
Signal significance
1)
-
1)
3.2 Checking Connections
DNP3.0/MOD-
Ethernet EN100
BUS, RS485
-
A
RTS (TTL level)
GND1
VCC1
-
B
-
Disabled
Input 24 V
Input 5 V
Return line
1)
Return line
Screen potential
-
Input 12 V
1)
Input 24 V
Screen potential
Tx+
Tx-
Rx+
-
-
Rx-
-
-
287
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