HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
13 - 10
Configuring RS-485 terminations for RS, A and B serial communications
CONFIGURATION OF CPUM / IOCN CARDS
13.4.1 RS-485 terminations for RS serial communications
For RS serial communications, jumpers on the underlying CPUM card (carrier board) are
used to configure RS-485 terminations.
For half-duplex RS-485 (2-wire), only jumpers J31 to J34 need to be configured.
For full-duplex RS-485 (4-wire), jumper groups J31 to J34 and J35 to J38 and must be
configured identically.
Further details on the RS-485 terminations can be found in Figure 13-11 and Table 13-1.
Table 13-1: RS-485 terminations for RS serial communications
Type of
RS-485
Serial
communications
(connector)
Jumper location Jumpers
Half-duplex
(2-wire)
RS
CPUM card
(carrier board)
J31 to J34
Full-duplex
(4-wire)
RS
CPUM card
(carrier board)
J31 to J34 and
J35 to J38
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