310
System Manual – MOVIDRIVE® compact Drive Inverters
9
Connecting option USS21A (RS232 and RS485)
Installation
9.11
Connecting option USS21A (RS232 and RS485)
Part number
Interface adapter option USS21A: 822 914 7
RS232
connection
•
Use a standard shielded interface cable with a 1:1 connection for connecting the
RS232 interface.
RS485
connection
Read the following connection instructions carefully:
•
Use a 2-core twisted and shielded copper cable (data transmission cable with
braided copper shield). The cable must meet the following specifications:
– Core cross section 0.5 ... 0.75 mm
2
(AWG 20 ... 18)
– Cable resistance 100 ... 150
Ω
at 1 MHz
– Capacitance per unit length
≤
40 pF/m at 1 kHz
•
Connect the shield at both ends to the electronics shield clamp of the inverter and
ensure the shield is connected over a large area. Also connect the ends of the shield
to DGND.
EIA standard
The RS485 interface of the USS21A complies with the EIA standard:
•
Max. transmission rate 9600 Baud
•
Max. 32 stations (each unit with USS21A counts as 2 stations)
•
Max. total cable length 200 m
•
Dynamic terminating resistor with fixed installation
02399AEN
Figure 116: USS21A - PC connection cable (1:1 connection assignment)
RxD
TxD
2
2
3
3
5
5
max. 5 m (16.5 ft)
USS21A
PC COM 1-4
5
5
3
3
2
2
2
3
5
5
3
2
9-pin sub D connector (female)
9-pin sub D connector (male)
GND (ground)
00997CXX
Figure 117: RS485 interface of USS21A
+
+
-
-
0V5
0V5
USS21A
USS21A
1
2
3
1
2
3
쵰
쵰
쵰
쵰
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