meteocontrol Power Control Operating Manual page 74

11.3.3.3 Main computer, RS232 IEC interface with PCU
The following example shows the connection of a ripple control receiver to a
main computer.
2
Fig. 47: Connection main computer <> PCU (IEC)
(1)
(2)
11.3.3.4 Connection PCU with WEB`log PRO, Modbus RTU
The PCU is connected to the WEB`log via RS485.
The selection of the connection socket depends on the protocol of the
inverters used, as Modbus and proprietary protocols cannot be operated via
the same connection.
Proprietary WR protocol to RS485 -> PCU to RS232/RS422 connection
Modbus WR protocol to RS485 -> PCU and WR to RS485 connection
Details on the configuration of the RS422 socket as an RS485 interface can
be found in the WEB`log Quick Reference Guide.
74/78
+ +
24V
RS232
Central computer
Signal input, IEC main
computer
1
+ +
3
Term
RS485 RS485
Protect
A B
A B high
(3)
meteocontrol Power Control 03082012 - en
Ethernet
Modbus
low
PCU