HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
13 - 6
Configuring A and B serial communications
CONFIGURATION OF CPUM / IOCN CARDS
13.3.2 Configuring A and B serial communications – AIM104-COM4 or equivalent
As shown in Figure 13-7, Figure 13-8, Figure 13-9 and Figure 13-10, jumper groups LK1,
LK2, LK3, LK4, LK5, LK6, LK7 and LK8 are used to configure factory settings and do not need
to be changed by the user.
Jumper group LK6 is used to configure the serial communications module (AIM104-COM4 or
equivalent) for operation with different versions of the CPUM card. LK6 (AB0) must be
removed for later versions of the CPUM card fitted with the PFM-541I or equivalent CPU
module, or LK6 (AB0) must be inserted for earlier versions of the CPUM card fitted with the
MSM586EN or equivalent CPU module.
Jumper groups LK9 and LK11 are used to configure RS-485 communications for connector
group A and jumper goups LK10 and LK12 are used to configure RS-485 communications
for connector group B.
Jumper groups LK13 and LK15 are used to configure the terminations for connector group A
and jumper goups LK14 and LK16 are used for connector group B.
The jumper settings for half-duplex RS-485 or full-duplex RS-485 communications are very
similar. The only difference is that in full-duplex mode, jumpers LK9 and LK10 must be
changed.
13.3.2.1 RS-485 selection, half-duplex (2-wire) configuration
For the AIM104-COM4 or equivalent serial communications module, the jumper settings to
select half-duplex RS-485 communications for the A and B connectors depends on the
version of the CPUM card being used:
• For later versions of the CPUM card fitted with the PFM-541I or equivalent CPU module,
the jumpers and terminations should be set as shown in Figure 13-7.
• For earlier versions of the CPUM card fitted with the MSM586EN or equivalent CPU
module, the jumpers and terminations should be set as shown in Figure 13-8.
13.3.2.2 RS-485 selection, full-duplex (4-wire) configuration
For the AIM104-COM4 or equivalent serial communications module, the jumper settings to
select full-duplex RS-485 communications for the A and B connectors depends on the version
of the CPUM card being used:
• For later versions of the CPUM card fitted with the PFM-541I or equivalent CPU module,
the jumpers and terminations should be set as shown in Figure 13-9.
• For earlier versions of the CPUM card fitted with the MSM586EN or equivalent CPU
module, the jumpers and terminations should be set as shown in Figure 13-10.
See also 13.4 Configuring RS-485 terminations for RS, A and B serial communications.
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