Manual Datafox PZE-MasterIV Basic
3.6.1.3 Conversion of RS232 to RS485
Up to 31 devices can be connected to a serial interface of a PC or server via a RS232-to-RS485 converter.
In this case the devices are connected via a RS485 bus. The power supply can be established using a
central power supply unit with adequate power. Note that the fall of voltage is dependent on wire cross-
section and length.
The pin assignment of the converter will be demonstrated using the Datafox converter RS232/485 (small)
as example. Gather the wiring of the RS485 bus from the following examples.
Caution:
Pay attention to the hardware version given in the examples. It is a precondition
for the prevailing example.
Figure 10: RS232 auf RS485 Bus
Connect the converter to the PC with a Sub-D 9-pole 1:1 cable as shown in figure
. The converter
replaces the PZE-MasterIV Basic.
Figure 11: RS485 Bus über Stiftleisten (RS485A HW V 2.0)
PIN 1/4 in figure
are supply entries which make a power supply of the device via the bus possible.
Caution:
If the power supply of the PZE-MasterIV Basic and the RS485 bus is established
via PIN 1/4 (male connector of the PZE-MasterIV Basic in figure
) direct voltage
must be used.
Version: 04.01.07.00
Page
26
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