Description ODSL 30
28 ODSL 30 Leuze electronic
However, it is important to maintain the bus idle levels (U
AB
200mV). If the PLC coupling
module does not include a bus termination with voltage divider, the following circuit may be
used.
Figure 3.9: Voltage divider for the RS 485 bus termination
The RS 422 connection does not require a bus termination for cable lengths up to about
20m and data transmission rates less than 9600 Baud.
Further information:
• RS 422: Electrical Specification acc. to DIN 66259, Part 3
• ISO 8482: Abstract
Specifies the physical medium characteristics for twisted pair multipoint interconnec-
tions in either 2-wire or 4-wire network topology, a binary and bi-directional signal
transfer, the electrical and mechanical design of the endpoint system branch cables
and the common trunk cable which may be up to 1200m in length, the component
measurements of the integrated type generators and receivers within the endpoint
system, the applicable data signaling rate up to 12.5Mbit/s.
+24 V
15 kΩ
470 Ω
1,5 kΩ
A (Tx+)
B (Tx-)
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