Document reference MAMPS-HW/E HARDWARE MANUAL
Edition 18 - March 2022 VM600 machinery protection system (MPS)
13 - 11
Configuring RS-485 terminations for RS, A and B serial communications
CONFIGURATION OF CPUM / IOCN CARDS
13.4.2 RS-485 terminations for A and B serial communications –
PNR 200-595-510-110 or equivalent
For the PNR 200-595-510-110 or equivalent serial communications module, jumpers on the
serial communications module are used to configure RS-485 terminations.
Each RS-485 differential pair can be terminated in one of six different ways, as shown in
Figure 13-12.
For half-duplex RS-485 (2-wire), only jumpers J31_A to J34_A need to be configured.
For full-duplex RS-485 (4-wire), jumper groups J31_A to J34_A and J31_B to J34_B must be
configured identically.
Further details on the RS-485 terminations can be found in Figure 13-12 and Table 13-2.
Table 13-2: RS-485 terminations for A and B serial communications –
PNR 200-595-510-110 or equivalent
Type of
RS-485
Serial
communications
(connector)
Jumper location Jumpers
Half-duplex
(2-wire)
A
Optional serial
communications module
(PNR 200-595-510-110 or
equivalent)
J31_A to J34_A
Half-duplex
(2-wire)
B
Optional serial
communications module
(PNR 200-595-510-110 or
equivalent)
J31_A to J34_A
Full-duplex
(4-wire)
A
Optional serial
communications module
(PNR 200-595-510-110 or
equivalent)
J31_A to J34_A and
J34_B to J34_B
Full-duplex
(4-wire)
B
Optional serial
communications module
(PNR 200-595-510-110 or
equivalent)
J31_A to J34_A and
J34_B to J34_B
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