2.4.6
RS 485 serial interface
(OPT.1)
NOTE
The RS 485 serial interface is installed in adapter slot 21; see type plate.
NOTE
The serial interface is a four-wire interface.
1.
Solder the litz wires to the connector as illustrated in fig. 2-15.
Pin
Signal
Meaning
1, 6
12VDC
MP 923 supply voltage
→
2, 7
GND
MP 923 supply voltage ground
→
3
TXD
Inverted transmitted data
→
4
RXD
Inverted received data
←
5
SGND
Signal ground
8
TXD
Transmitted data
→
9
RXD
Received data
←
←
Input
→
Output
2.
Push the shield back and fix with a cable tie.
3.
Insert two threaded bolts (fig. 2-16) into the connector shell.
4.
Place the connector into the connector shell.
5.
Fasten the cable and the shield to the connector shell with screws,
providing for strain relief.
ATTENTION
Ensure good electrical contact between the shield and the con-
nector shell.
Connect the shield on both ends.
6.
Assemble the two parts of the connector shell with two screws.
7.
Fasten the connector to the front panel (item 21) with screws.
NOTE
For a PC with RS 232 interface, the MP 923 interface converter can be
used (see chapter 6.2.3).
NOTE
The MP 924 interface distributor can be used for controlling eight units
(see chapter 6.2.4).
21
OPT.1
Installation
2-18
WDP3-01X Ident. no.: 00441109760
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