18
Connection "RS-485"
7
Connection "
RS-485
"
7.1
Connections
The connection designated "
RS-485
" on the electronic drive unit is occupied with the
built-in display and control unit DCU 002. The external connection of a Pfeiffer Vacuum
handheld programming unit (HPU)
or
a PC is possible. The interface is electrically iso-
lated from the maximum supply voltage of the electronic drive unit. The electrical cou-
plings are optically decoupled internally.
7.2
Connecting Pfeiffer Vacuum display and control units or PC
The connection of respectively one external operating unit is possible on the interface
RS-485.
A USB interface (PC) can be connected via the USB/RS-485-converter.
Disconnecting the internal connection "
RS485
" to "
RS485in
" disables the integrated
DCU 002 und the "
gauge
" connector socket connected to it.
Fig. 8:
Optional connection possibilities for interface RS-485
Designation
Value
Serial interface
RS-485
Baud rate
9600 bauds
Data word length
8 bits
Parity
none (no parity)
Start bits
1
Stop bits
1..2
1
2
3
4
5
Pin
Assignment
1
RS-485: D+
2
+24 V output, loadable with
210 mA (with remote - pin 1)
3
GND
4
RS-485: D-
5
not connected
DCU 002
HPU 001
RS485
USB/RS485-converter