10-2 Set-Up Interfaces SYNAX200
DOK-SYNAX*-SY*-07VRS**-PR01-EN-P
10.3 RS485 Link
SynTop can communicate with many PPCs using an RS485 link.
RS485
RS232
SynTop
PPC +
DAQ
SY7PR059.FH7
24V
further
SYNAX rings
master axis link
PPC-R02.2
H1
PROG
X10
8888
RECO
PPC-R02.2
H1
PROG
X10
8888
RECO
DAQ DAQ
Fig. 10-3: RS485 link of SynTop to multiple PPCs
This necessitates couplers from RS485 to RS232 for the connection of
the PC to the RS485 link.
An example is the coupler interface module PSM-EG-RS232/RS485-P/2D
made by Phoenix Contact.
Interface Module PSM-EG-RS232/RS485-P/2D
The RS485 directional switches of the module uses the RTS signal. with
these cables the TxD of the sender is connected to the RTS of the
module, i.e. with each 1 bit there is a switch to transmit.
Switch settings:
• 180R BUS-END ON (only at the end of the bus)
• S1 on DTE
• RTS/CTS high-active (bridge jumper X6 from pin 3 to pin 4)
With switch 180R BUS-END a matching resistor 180R and each 470R
against +5V and GND can be connected to the bus end.
The voltage supply for the interface modules comes from 24 V which is
connected via the intended screw-in clamps.
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