Siemens 7XV5673 Device Manual page 199

Serial Interface
RS485
Optical
Termination of RS485 Bus (Terminal J)
DC +5 V
Figure 11-1
The bus termination must be respectively carried out at the first and last RS485 device interface of the bus. No
terminating resistor may be used at all other devices in this line.
Siemens recommends the use of a bus termination plug with integrated (activatable) resistors in accordance
with Figure 11-1, for example plugs with 35°-cable outlet type 6ES7972-0BA42-0XA0 (see chapter 2.2). Use a
2-wired, twisted and shielded cable (see chapter 2.2). In case of outdoor mounting Siemens recommends a
SICAM I/O Unit, 7XV5673, Device Manual
E50417-H1040-C484-A3, Edition 05.2012
SICAM I/O Unit 7XV5673-0JJ10-1AA1
Connection
Protocol/Operating mode
Baud rate (adjustable)
Maximum distance of
transmission
Transmission level
Reception level
Bus termination
SICAM I/O Unit 7XV5673-0JJ20-1AA1
Connection
Protocol/Operating mode
Baud rate
Maximum distance of
transmission
Receiver sensitivity
Optical budget
390 Ω 220 Ω
Bus termination
A
Bus Termination of the RS485 Interface with Pullup/pulldown Resistors
Terminal side, 9 pin D-sub socket
Modbus RTU
Min. 1 200 bit/s
Max. 115 000 bit/s;
Default setting 19 200 bit/s
Max. 1 km, three-wire line, twisted, shielded
Low: -5 V to -1.5 V
High: +5 V to +1.5 V
Low: ≤ -0.2 V
High: ≥ +0.2 V
Not integrated, bus termination using plugs with integrated
bus terminating resistors (see Figure 11-1)
Terminal side,
ST connector plug, 820 nm
Bending radiuses: According to optical fiber cable used
Modbus RTU
Min. 1 200 bit/s
Max. 115 000 bit/s;
Default setting 19 200 bit/s
Max. 2000 m at 62.5 μm/125 μm multimode optical fiber
-24 dBm at 62.5 μm/125 μm multimode optical fiber
Min. 8 dB at 62.5 μm/125 μm multimode optical fiber
390 Ω
B
11 Technical Data
11.1 General Device Data
I/O mirror
Min. 1 200 bit/s
Max. 187 500 bit/s;
Default setting 115 200 bit/s
I/O mirror
Min. 1 200 bit/s
Max. 187 500 bit/s;
Default setting 115 200 bit/s
GND
199