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Installation
4
Connecting option USS21A (RS232 and RS485)
4.11
Connecting option USS21A (RS232 and RS485)
Part number
RS232
connection
RS485
connection
EIA standard
44
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Interface adapter option USS21A: 822 914 7
•
Use a standard shielded interface cable with a 1:1 connection for connecting the
RS232 interface.
USS21A
5
5
5
3
3
3
2
2
2
9-pin sub D connector (male)
Figure 20: USS21A - PC connection cable (1:1 connection assignment)
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
– 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.
USS21A
+
0V5
-
Figure 21: RS485 interface of USS21A
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
Operating Instructions – MOVIDRIVE® compact MCH4_A Drive Inverters
GND (ground)
TxD
RxD
max. 5 m (16.5 ft)
9-pin sub D connector (female)
2
(AWG 20 ... 18)
USS21A
+
0V5
-
PC COM 1-4
5
5
5
3
3
3
2
2
2
02399AEN
00997CXX
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