Document reference MAMPS-HW/E HARDWARE MANUAL
Edition 18 - March 2022 VM600 machinery protection system (MPS)
13 - 3
Configuring RS serial communications
CONFIGURATION OF CPUM / IOCN CARDS
13.2.3 RS-485 selection, full-duplex (4-wire) configuration
The jumper settings for full-duplex (4-wire) RS-485 communications are similar to those for
half-duplex except for the position of jumper J29 (see Figure 13-3 and Figure 13-4).
If terminations are needed, jumper groups J31 to J34 and J35 to J38 should have the same
configuration, that is, J31 should be set like J35, J32 like J36, J33 like J37 and J34 like J38.
The location of the jumpers on the CPUM card can be found using Figure 13-16 or
Figure 13-17.
NOTE: The default configuration for CPUM/IOCN card pairs is full-duplex RS-485, with
each differential pair terminated with a 120 Ω resistor (see case (b) of
Figure 13-11).
CPUM and IOCN card pairs will be delivered with the default configuration, unless
a different one is specified by the customer.
J28
J29
J34
J33
J32
J31
J38
J37
J36
J35
J43
J45
J41
J44
J46
J39
Set if
terminations
needed
Figure 13-3: CPUM card jumper settings to select half-duplex RS-485 (RS connector)
J28
J29
J34
J33
J32
J31
J38
J37
J36
J35
J43
J45
J41
J44
J46
J39
Set if
terminations
needed
Figure 13-4: CPUM card jumper settings to select full-duplex RS-485 (RS connector)
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